Add snapshot evidence to cancel-cascade MTF issue doc

Append "Snapshot evidence (2026-05-13)" section to
`cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`
documenting `fail_after_w_trace` diag capture results for
`test_nested_multierrors` under the MTF backend — reproduction cmd,
ptree analysis, observed hang signature, and updated triage plan.

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

(cherry picked from commit 5372fd178a)

.claude/ai_notes/docs_todos.md

@@ -0,0 +1,38 @@
+# Docs TODOs
+
+## Auto-sync README code examples with source
+
+The `docs/README.rst` has inline code blocks that
+duplicate actual example files (e.g.
+`examples/infected_asyncio_echo_server.py`). Every time
+the public API changes we have to manually sync both.
+
+Sphinx's `literalinclude` directive can pull code directly
+from source files:
+
+```rst
+.. literalinclude:: ../examples/infected_asyncio_echo_server.py
+   :language: python
+   :caption: examples/infected_asyncio_echo_server.py
+```
+
+Or to include only a specific function/section:
+
+```rst
+.. literalinclude:: ../examples/infected_asyncio_echo_server.py
+   :language: python
+   :pyobject: aio_echo_server
+```
+
+This way the docs always reflect the actual code without
+manual syncing.
+
+### Considerations
+- `README.rst` is also rendered on GitHub/PyPI which do
+  NOT support `literalinclude` - so we'd need a build
+  step or a separate `_sphinx_readme.rst` (which already
+  exists at `docs/github_readme/_sphinx_readme.rst`).
+- Could use a pre-commit hook or CI step to extract code
+  from examples into the README for GitHub rendering.
+- Another option: `sphinx-autodoc` style approach where
+  docstrings from the actual module are pulled in.

.claude/notes/rt_vars_lift_plan.md

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+# `RuntimeVars` env-var lift — design plan
+
+Status: **draft, awaiting user edits**
+
+## Goal
+
+Consolidate the sprawl of pytest CLI flags + ad-hoc env vars +
+hardcoded fixture defaults into a *single* env-var-encoded
+runtime-vars envelope, with a typed in-memory representation
+(`tractor.runtime._state.RuntimeVars`) as the sole source of
+truth.
+
+## Why now
+
+- `--tpt-proto`, `--spawn-backend`, `--diag-on-hang`,
+  `--diag-capture-delay` and (soon) `TRACTOR_REG_ADDR` etc. are
+  proliferating. Each adds a parsing seam.
+- `tests/devx/test_debugger.py` invokes example scripts as
+  separate subprocesses; they currently can't see the
+  fixture-allocated `reg_addr` at all (root cause of why
+  parametrizing devx scripts on `reg_addr` is on your TODO).
+- Concurrent pytest sessions on the same host collide on
+  shared defaults (the `registry@1616` race we just fixed is
+  one symptom; per-session unique addr is the structural
+  fix).
+- `tractor.runtime._state.RuntimeVars: Struct` is already
+  defined and **unused** — its docstring even says it
+  "should be utilized as possible for future calls."
+
+## Design
+
+### Module: `tractor/_testing/_rtvars.py`
+
+Lifted from `modden.runtime.env`, ~50 LOC, no new deps.
+
+```python
+_TRACTOR_RT_VARS_OSENV: str = '_TRACTOR_RT_VARS'
+
+def dump_rtvars(rtvars: RuntimeVars|dict) -> tuple[str, str]:
+    '''str-serialize via `str(dict)` — ast.literal_eval-able'''
+
+def load_rtvars(env: dict) -> RuntimeVars:
+    '''ast.literal_eval the env-var value, hydrate to struct'''
+
+def get_rtvars(proc: psutil.Process|None = None) -> RuntimeVars:
+    '''read the var from a target proc's env (or current)'''
+
+def update_rtvars(
+    rtvars: RuntimeVars|dict|None = None,
+    update_osenv: bool|dict = True,
+) -> tuple[str, str]:
+    '''mutate + re-encode + (optionally) write to os.environ'''
+```
+
+### Encoding choice: `str(dict)` + `ast.literal_eval`
+
+Pros:
+- stdlib only
+- handles all the types tractor's tests need: `str`, `int`,
+  `float`, `bool`, `None`, `list`, `tuple`, `dict`
+- human-readable in the env (greppable, inspectable via
+  `cat /proc/<pid>/environ | tr '\0' '\n'`)
+
+Cons:
+- non-stdlib types (msgspec Structs, `Path`, custom classes)
+  must be lowered first — fine for the test fixture set
+- not stable across Python versions for esoteric repr cases
+  (we don't hit any)
+
+Alternatives considered:
+- **msgpack**: adds a dep + binary form is ungreppable
+- **json**: doesn't preserve tuples (becomes lists), which is
+  a common type for `reg_addr`
+- **toml/yaml**: heavier deps, no real benefit
+
+### `RuntimeVars` becomes the single source of truth
+
+The legacy `_runtime_vars: dict[str, Any]` global in
+`runtime/_state.py` becomes a *cached view* of a
+`RuntimeVars` singleton instance:
+
+- `get_runtime_vars()` returns either the struct or a
+  `.to_dict()` view depending on caller's preference
+- `set_runtime_vars(...)` validates against the struct schema
+- spawn-time SpawnSpec sends the struct (already does
+  conceptually — just gets typed)
+- `__setattr__` `breakpoint()` debug instrumentation gets
+  removed (unrelated cleanup, mentioned in conversation)
+
+### Migration path
+
+**Phase 0** *(prep)*: strip the stray `breakpoint()` from
+`RuntimeVars.__setattr__`.
+
+**Phase 1**: land `_rtvars.py` as a leaf module, used only by
+test infra. Subprocess-spawned scripts in `tests/devx/`
+read `_TRACTOR_RT_VARS` on startup → reconstruct
+`RuntimeVars` → call `tractor.open_root_actor(**rtvars.as_kwargs())`.
+Concurrent runs become deterministic-isolated because each
+session writes a unique `_registry_addrs` into the env.
+
+**Phase 2**: migrate runtime callers (`_state.get_runtime_vars`,
+spawn `SpawnSpec`, `Actor.async_main`) to operate on the
+struct directly, with the dict as a compat view that gets
+deprecated.
+
+**Phase 3** *(structural)*: per-session bindspace subdir
+`/run/user/<uid>/tractor/<session_uuid>/` — encoded in the
+rt-vars envelope, picked up by every subactor automatically.
+Obsoletes the entire bindspace-leak warning class.
+
+## Open design questions (user input wanted)
+
+- (placeholder for your edits)
+- (placeholder)
+- (placeholder)
+
+## Out-of-scope for this lift
+
+- Anything in `modden.runtime.env` related to `Spawn`,
+  `WmCtl`, `Wks` — that's a workspace orchestration layer,
+  not an env-var helper. We only lift the four utility
+  functions + the var name constant.
+- Switching to msgpack/json — explicitly chosen against
+  above.

.claude/settings.local.json

@@ -0,0 +1,42 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(cp .claude/*)",
+      "Read(.claude/**)",
+      "Read(.claude/skills/run-tests/**)",
+      "Write(.claude/**/*commit_msg*)",
+      "Write(.claude/git_commit_msg_LATEST.md)",
+      "Skill(run-tests)",
+      "Skill(close-wkt)",
+      "Skill(open-wkt)",
+      "Skill(prompt-io)",
+      "Bash(date *)",
+      "Bash(git diff *)",
+      "Bash(git log *)",
+      "Bash(git status)",
+      "Bash(git remote:*)",
+      "Bash(git stash:*)",
+      "Bash(git mv:*)",
+      "Bash(git rev-parse:*)",
+      "Bash(test:*)",
+      "Bash(ls:*)",
+      "Bash(grep:*)",
+      "Bash(find:*)",
+      "Bash(ln:*)",
+      "Bash(cat:*)",
+      "Bash(mkdir:*)",
+      "Bash(gh pr:*)",
+      "Bash(gh api:*)",
+      "Bash(gh issue:*)",
+      "Bash(UV_PROJECT_ENVIRONMENT=py* uv sync:*)",
+      "Bash(UV_PROJECT_ENVIRONMENT=py* uv run:*)",
+      "Bash(echo EXIT:$?:*)",
+      "Bash(echo \"EXIT=$?\")",
+      "Read(/tmp/**)"
+    ],
+    "deny": [],
+    "ask": []
+  },
+  "prefersReducedMotion": false,
+  "outputStyle": "default"
+}

.claude/skills/commit-msg/style-guide-reference.md

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+# Commit Message Style Guide for `tractor`
+
+Analysis based on 500 recent commits from the `tractor` repository.
+
+## Core Principles
+
+Write commit messages that are technically precise yet casual in
+tone. Use abbreviations and informal language while maintaining
+clarity about what changed and why.
+
+## Subject Line Format
+
+### Length and Structure
+- Target: ~50 chars with a hard-max of 67.
+- Use backticks around code elements (72.2% of commits)
+- Rarely use colons (5.2%), except for file prefixes
+- End with '?' for uncertain changes (rare: 0.8%)
+- End with '!' for important changes (rare: 2.0%)
+
+### Opening Verbs (Present Tense)
+
+Most common verbs from analysis:
+- `Add` (14.4%) - wholly new features/functionality
+- `Use` (4.4%) - adopt new approach/tool
+- `Drop` (3.6%) - remove code/feature
+- `Fix` (2.4%) - bug fixes
+- `Move`/`Mv` (3.6%) - relocate code
+- `Adjust` (2.0%) - minor tweaks
+- `Update` (1.6%) - enhance existing feature
+- `Bump` (1.2%) - dependency updates
+- `Rename` (1.2%) - identifier changes
+- `Set` (1.2%) - configuration changes
+- `Handle` (1.0%) - add handling logic
+- `Raise` (1.0%) - add error raising
+- `Pass` (0.8%) - pass parameters/values
+- `Support` (0.8%) - add support for something
+- `Hide` (1.4%) - make private/internal
+- `Always` (1.4%) - enforce consistent behavior
+- `Mk` (1.4%) - make/create (abbreviated)
+- `Start` (1.0%) - begin implementation
+
+Other frequent verbs: `More`, `Change`, `Extend`, `Disable`, `Log`,
+`Enable`, `Ensure`, `Expose`, `Allow`
+
+### Backtick Usage
+
+Always use backticks for:
+- Module names: `trio`, `asyncio`, `msgspec`, `greenback`, `stackscope`
+- Class names: `Context`, `Actor`, `Address`, `PldRx`, `SpawnSpec`
+- Method names: `.pause_from_sync()`, `._pause()`, `.cancel()`
+- Function names: `breakpoint()`, `collapse_eg()`, `open_root_actor()`
+- Decorators: `@acm`, `@context`
+- Exceptions: `Cancelled`, `TransportClosed`, `MsgTypeError`
+- Keywords: `finally`, `None`, `False`
+- Variable names: `tn`, `debug_mode`
+- Complex expressions: `trio.Cancelled`, `asyncio.Task`
+
+Most backticked terms in tractor:
+`trio`, `asyncio`, `Context`, `.pause_from_sync()`, `tn`,
+`._pause()`, `breakpoint()`, `collapse_eg()`, `Actor`, `@acm`,
+`.cancel()`, `Cancelled`, `open_root_actor()`, `greenback`
+
+### Examples
+
+Good subject lines:
+```
+Add `uds` to `._multiaddr`, tweak typing
+Drop `DebugStatus.shield` attr, add `.req_finished`
+Use `stackscope` for all actor-tree rendered "views"
+Fix `.to_asyncio` inter-task-cancellation!
+Bump `ruff.toml` to target py313
+Mv `load_module_from_path()` to new `._code_load` submod
+Always use `tuple`-cast for singleton parent addrs
+```
+
+## Body Format
+
+### General Structure
+- 43.2% of commits have no body (simple changes)
+- Use blank line after subject
+- Max line length: 67 chars
+- Use `-` bullets for lists (28.0% of commits)
+- Rarely use `*` bullets (2.4%)
+
+### Section Markers
+
+Use these markers to organize longer commit bodies:
+- `Also,` (most common: 26 occurrences)
+- `Other,` (13 occurrences)
+- `Deats,` (11 occurrences) - for implementation details
+- `Further,` (7 occurrences)
+- `TODO,` (3 occurrences)
+- `Impl details,` (2 occurrences)
+- `Notes,` (1 occurrence)
+
+### Common Abbreviations
+
+Use these freely (sorted by frequency):
+- `msg` (63) - message
+- `bg` (37) - background
+- `ctx` (30) - context
+- `impl` (27) - implementation
+- `mod` (26) - module
+- `obvi` (17) - obviously
+- `tn` (16) - task name
+- `fn` (15) - function
+- `vs` (15) - versus
+- `bc` (14) - because
+- `var` (14) - variable
+- `prolly` (9) - probably
+- `ep` (6) - entry point
+- `OW` (5) - otherwise
+- `rn` (4) - right now
+- `sig` (4) - signal/signature
+- `deps` (3) - dependencies
+- `iface` (2) - interface
+- `subproc` (2) - subprocess
+- `tho` (2) - though
+- `ofc` (2) - of course
+
+### Tone and Style
+
+- Casual but technical (use `XD` for humor: 23 times)
+- Use `..` for trailing thoughts (108 occurrences)
+- Use `Woops,` to acknowledge mistakes (4 subject lines)
+- Don't be afraid to show personality while being precise
+
+### Example Bodies
+
+Simple with bullets:
+```
+Add `multiaddr` and bump up some deps
+
+Since we're planning to use it for (discovery)
+addressing, allowing replacement of the hacky (pretend)
+attempt in `tractor._multiaddr` Bp
+
+Also pin some deps,
+- make us py312+
+- use `pdbp` with my frame indexing fix.
+- mv to latest `xonsh` for fancy cmd/suggestion injections.
+
+Bump lock file to match obvi!
+```
+
+With section markers:
+```
+Use `stackscope` for all actor-tree rendered "views"
+
+Instead of the (much more) limited and hacky `.devx._code`
+impls, move to using the new `.devx._stackscope` API which
+wraps the `stackscope` project.
+
+Deats,
+- make new `stackscope.extract_stack()` wrapper
+- port over frame-descing to `_stackscope.pformat_stack()`
+- move `PdbREPL` to use `stackscope` render approach
+- update tests for new stack output format
+
+Also,
+- tweak log formatting for consistency
+- add typing hints throughout
+```
+
+## Special Patterns
+
+### WIP Commits
+Rare (0.2%) - avoid committing WIP if possible
+
+### Merge Commits
+Auto-generated (4.4%), don't worry about style
+
+### File References
+- Use `module.py` or `.submodule` style
+- Rarely use `file.py:line` references (0 in analysis)
+
+### Links
+- GitHub links used sparingly (3 total)
+- Prefer code references over external links
+
+## Footer
+
+The default footer should credit `claude` (you) for helping generate
+the commit msg content:
+
+```
+(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
+[claude-code-gh]: https://github.com/anthropics/claude-code
+```
+
+Further, if the patch was solely or in part written
+by `claude`, instead add:
+
+```
+(this patch was generated in some part by [`claude-code`][claude-code-gh])
+[claude-code-gh]: https://github.com/anthropics/claude-code
+```
+
+## Summary Checklist
+
+Before committing, verify:
+- [ ] Subject line uses present tense verb
+- [ ] Subject line ~50 chars (hard max 67)
+- [ ] Code elements wrapped in backticks
+- [ ] Body lines ≤67 chars
+- [ ] Abbreviations used where natural
+- [ ] Casual yet precise tone
+- [ ] Section markers if body >3 paragraphs
+- [ ] Technical accuracy maintained
+
+## Analysis Metadata
+
+```
+Source: tractor repository
+Commits analyzed: 500
+Date range: 2019-2025
+Analysis date: 2026-02-08
+```
+
+---
+
+(this style guide was generated by [`claude-code`][claude-code-gh]
+analyzing commit history)
+
+[claude-code-gh]: https://github.com/anthropics/claude-code

.claude/skills/conc-anal/SKILL.md

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+---
+name: conc-anal
+description: >
+  Concurrency analysis for tractor's trio-based
+  async primitives. Trace task scheduling across
+  checkpoint boundaries, identify race windows in
+  shared mutable state, and verify synchronization
+  correctness. Invoke on code segments the user
+  points at, OR proactively when reviewing/writing
+  concurrent cache, lock, or multi-task acm code.
+argument-hint: "[file:line-range or function name]"
+allowed-tools:
+  - Read
+  - Grep
+  - Glob
+  - Task
+---
+
+Perform a structured concurrency analysis on the
+target code. This skill should be invoked:
+
+- **On demand**: user points at a code segment
+  (file:lines, function name, or pastes a snippet)
+- **Proactively**: when writing or reviewing code
+  that touches shared mutable state across trio
+  tasks — especially `_Cache`, locks, events, or
+  multi-task `@acm` lifecycle management
+
+## 0. Identify the target
+
+If the user provides a file:line-range or function
+name, read that code. If not explicitly provided,
+identify the relevant concurrent code from context
+(e.g. the current diff, a failing test, or the
+function under discussion).
+
+## 1. Inventory shared mutable state
+
+List every piece of state that is accessed by
+multiple tasks. For each, note:
+
+- **What**: the variable/dict/attr (e.g.
+  `_Cache.values`, `_Cache.resources`,
+  `_Cache.users`)
+- **Scope**: class-level, module-level, or
+  closure-captured
+- **Writers**: which tasks/code-paths mutate it
+- **Readers**: which tasks/code-paths read it
+- **Guarded by**: which lock/event/ordering
+  protects it (or "UNGUARDED" if none)
+
+Format as a table:
+
+```
+| State               | Writers         | Readers         | Guard          |
+|---------------------|-----------------|-----------------|----------------|
+| _Cache.values       | run_ctx, moc¹   | moc             | ctx_key lock   |
+| _Cache.resources    | run_ctx, moc    | moc, run_ctx    | UNGUARDED      |
+```
+
+¹ `moc` = `maybe_open_context`
+
+## 2. Map checkpoint boundaries
+
+For each code path through the target, mark every
+**checkpoint** — any `await` expression where trio
+can switch to another task. Use line numbers:
+
+```
+L325: await lock.acquire()        ← CHECKPOINT
+L395: await service_tn.start(...) ← CHECKPOINT
+L411: lock.release()              ← (not a checkpoint, but changes lock state)
+L414: yield (False, yielded)      ← SUSPEND (caller runs)
+L485: no_more_users.set()         ← (wakes run_ctx, no switch yet)
+```
+
+**Key trio scheduling rules to apply:**
+- `Event.set()` makes waiters *ready* but does NOT
+  switch immediately
+- `lock.release()` is not a checkpoint
+- `await sleep(0)` IS a checkpoint
+- Code in `finally` blocks CAN have checkpoints
+  (unlike asyncio)
+- `await` inside `except` blocks can be
+  `trio.Cancelled`-masked
+
+## 3. Trace concurrent task schedules
+
+Write out the **interleaved execution trace** for
+the problematic scenario. Number each step and tag
+which task executes it:
+
+```
+[Task A]  1. acquires lock
+[Task A]  2. cache miss → allocates resources
+[Task A]  3. releases lock
+[Task A]  4. yields to caller
+[Task A]  5. caller exits → finally runs
+[Task A]  6. users-- → 0, sets no_more_users
+[Task A]  7. pops lock from _Cache.locks
+[run_ctx] 8. wakes from no_more_users.wait()
+[run_ctx] 9. values.pop(ctx_key)
+[run_ctx] 10. acm __aexit__ → CHECKPOINT
+[Task B]  11. creates NEW lock (old one popped)
+[Task B]  12. acquires immediately
+[Task B]  13. values[ctx_key] → KeyError
+[Task B]  14. resources[ctx_key] → STILL EXISTS
+[Task B]  15. 💥 RuntimeError
+```
+
+Identify the **race window**: the range of steps
+where state is inconsistent. In the example above,
+steps 9–10 are the window (values gone, resources
+still alive).
+
+## 4. Classify the bug
+
+Categorize what kind of concurrency issue this is:
+
+- **TOCTOU** (time-of-check-to-time-of-use): state
+  changes between a check and the action based on it
+- **Stale reference**: a task holds a reference to
+  state that another task has invalidated
+- **Lifetime mismatch**: a synchronization primitive
+  (lock, event) has a shorter lifetime than the
+  state it's supposed to protect
+- **Missing guard**: shared state is accessed
+  without any synchronization
+- **Atomicity gap**: two operations that should be
+  atomic have a checkpoint between them
+
+## 5. Propose fixes
+
+For each proposed fix, provide:
+
+- **Sketch**: pseudocode or diff showing the change
+- **How it closes the window**: which step(s) from
+  the trace it eliminates or reorders
+- **Tradeoffs**: complexity, perf, new edge cases,
+  impact on other code paths
+- **Risk**: what could go wrong (deadlocks, new
+  races, cancellation issues)
+
+Rate each fix: `[simple|moderate|complex]` impl
+effort.
+
+## 6. Output format
+
+Structure the full analysis as:
+
+```markdown
+## Concurrency analysis: `<target>`
+
+### Shared state
+<table from step 1>
+
+### Checkpoints
+<list from step 2>
+
+### Race trace
+<interleaved trace from step 3>
+
+### Classification
+<bug type from step 4>
+
+### Fixes
+<proposals from step 5>
+```
+
+## Tractor-specific patterns to watch
+
+These are known problem areas in tractor's
+concurrency model. Flag them when encountered:
+
+### `_Cache` lock vs `run_ctx` lifetime
+
+The `_Cache.locks` entry is managed by
+`maybe_open_context` callers, but `run_ctx` runs
+in `service_tn` — a different task tree. Lock
+pop/release in the caller's `finally` does NOT
+wait for `run_ctx` to finish tearing down. Any
+state that `run_ctx` cleans up in its `finally`
+(e.g. `resources.pop()`) is vulnerable to
+re-entry races after the lock is popped.
+
+### `values.pop()` → acm `__aexit__` → `resources.pop()` gap
+
+In `_Cache.run_ctx`, the inner `finally` pops
+`values`, then the acm's `__aexit__` runs (which
+has checkpoints), then the outer `finally` pops
+`resources`. This creates a window where `values`
+is gone but `resources` still exists — a classic
+atomicity gap.
+
+### Global vs per-key counters
+
+`_Cache.users` as a single `int` (pre-fix) meant
+that users of different `ctx_key`s inflated each
+other's counts, preventing teardown when one key's
+users hit zero. Always verify that per-key state
+(`users`, `locks`) is actually keyed on `ctx_key`
+and not on `fid` or some broader key.
+
+### `Event.set()` wakes but doesn't switch
+
+`trio.Event.set()` makes waiting tasks *ready* but
+the current task continues executing until its next
+checkpoint. Code between `.set()` and the next
+`await` runs atomically from the scheduler's
+perspective. Use this to your advantage (or watch
+for bugs where code assumes the woken task runs
+immediately).
+
+### `except` block checkpoint masking
+
+`await` expressions inside `except` handlers can
+be masked by `trio.Cancelled`. If a `finally`
+block runs from an `except` and contains
+`lock.release()`, the release happens — but any
+`await` after it in the same `except` may be
+swallowed. This is why `maybe_open_context`'s
+cache-miss path does `lock.release()` in a
+`finally` inside the `except KeyError`.
+
+### Cancellation in `finally`
+
+Unlike asyncio, trio allows checkpoints in
+`finally` blocks. This means `finally` cleanup
+that does `await` can itself be cancelled (e.g.
+by nursery shutdown). Watch for cleanup code that
+assumes it will run to completion.
+
+### Unbounded waits in cleanup paths
+
+Any `await <event>.wait()` in a teardown path is
+a latent deadlock unless the event's setter is
+GUARANTEED to fire. If the setter depends on
+external state (peer disconnects, child process
+exit, subsequent task completion) that itself
+depends on the current task's progress, you have
+a mutual wait.
+
+Rule: **bound every `await X.wait()` in cleanup
+paths with `trio.move_on_after()`** unless you
+can prove the setter is unconditionally reachable
+from the state at the await site. Concrete recent
+example: `ipc_server.wait_for_no_more_peers()` in
+`async_main`'s finally (see
+`ai/conc-anal/subint_forkserver_test_cancellation_leak_issue.md`
+"probe iteration 3") — it was unbounded, and when
+one peer-handler was stuck the wait-for-no-more-
+peers event never fired, deadlocking the whole
+actor-tree teardown cascade.
+
+### The capture-pipe-fill hang pattern (grep this first)
+
+When investigating any hang in the test suite
+**especially under fork-based backends**, first
+check whether the hang reproduces under `pytest
+-s` (`--capture=no`). If `-s` makes it go away
+you're not looking at a trio concurrency bug —
+you're looking at a Linux pipe-buffer fill.
+
+Mechanism: pytest replaces fds 1,2 with pipe
+write-ends. Fork-child subactors inherit those
+fds. High-volume error-log tracebacks (cancel
+cascade spew) fill the 64KB pipe buffer. Child
+`write()` blocks. Child can't exit. Parent's
+`waitpid`/pidfd wait blocks. Deadlock cascades up
+the tree.
+
+Pre-existing guards in `tests/conftest.py` encode
+this knowledge — grep these BEFORE blaming
+concurrency:
+
+```python
+# tests/conftest.py:258
+if loglevel in ('trace', 'debug'):
+    # XXX: too much logging will lock up the subproc (smh)
+    loglevel: str = 'info'
+
+# tests/conftest.py:316
+# can lock up on the `_io.BufferedReader` and hang..
+stderr: str = proc.stderr.read().decode()
+```
+
+Full post-mortem +
+`ai/conc-anal/subint_forkserver_test_cancellation_leak_issue.md`
+for the canonical reproduction. Cost several
+investigation sessions before catching it —
+because the capture-pipe symptom was masked by
+deeper cascade-deadlocks. Once the cascades were
+fixed, the tree tore down enough to generate
+pipe-filling log volume → capture-pipe finally
+surfaced. Grep-note for future-self: **if a
+multi-subproc tractor test hangs, `pytest -s`
+first, conc-anal second.**

.claude/skills/pr-msg/format-reference.md

@@ -0,0 +1,241 @@
+# PR/Patch-Request Description Format Reference
+
+Canonical structure for `tractor` patch-request
+descriptions, designed to work across GitHub,
+Gitea, SourceHut, and GitLab markdown renderers.
+
+**Line length: wrap at 72 chars** for all prose
+content (Summary bullets, Motivation paragraphs,
+Scopes bullets, etc.). Fill lines *to* 72 — don't
+stop short at 50-65. Only raw URLs in
+reference-link definitions may exceed this.
+
+## Template
+
+```markdown
+<!-- pr-msg-meta
+branch: <branch-name>
+base: <base-branch>
+submitted:
+  github: ___
+  gitea: ___
+  srht: ___
+-->
+
+## <Title: present-tense verb + backticked code>
+
+### Summary
+- [<hash>][<hash>] Description of change ending
+  with period.
+- [<hash>][<hash>] Another change description
+  ending with period.
+- [<hash>][<hash>] [<hash>][<hash>] Multi-commit
+  change description.
+
+### Motivation
+<1-2 paragraphs: problem/limitation first,
+then solution. Hard-wrap at 72 chars.>
+
+### Scopes changed
+- [<hash>][<hash>] `pkg.mod.func()` — what
+  changed.
+  * [<hash>][<hash>] Also adjusts
+    `.related_thing()` in same module.
+- [<hash>][<hash>] `tests.test_mod` — new/changed
+  test coverage.
+
+<!--
+### Cross-references
+Also submitted as
+[github-pr][] | [gitea-pr][] | [srht-patch][].
+
+### Links
+- [relevant-issue-or-discussion](url)
+- [design-doc-or-screenshot](url)
+-->
+
+(this pr content was generated in some part by
+[`claude-code`][claude-code-gh])
+
+[<hash>]: https://<service>/<owner>/<repo>/commit/<hash>
+[claude-code-gh]: https://github.com/anthropics/claude-code
+
+<!-- cross-service pr refs (fill after submit):
+[github-pr]: https://github.com/<owner>/<repo>/pull/___
+[gitea-pr]: https://<host>/<owner>/<repo>/pulls/___
+[srht-patch]: https://git.sr.ht/~<owner>/<repo>/patches/___
+-->
+```
+
+## Markdown Reference-Link Strategy
+
+Use reference-style links for ALL commit hashes
+and cross-service PR refs to ensure cross-service
+compatibility:
+
+**Inline usage** (in bullets):
+```markdown
+- [f3726cf9][f3726cf9] Add `reg_err_types()`
+  for custom exc lookup.
+```
+
+**Definition** (bottom of document):
+```markdown
+[f3726cf9]: https://github.com/goodboy/tractor/commit/f3726cf9
+```
+
+### Why reference-style?
+- Keeps prose readable without long inline URLs.
+- All URLs in one place — trivially swappable
+  per-service.
+- Most git services auto-link bare SHAs anyway,
+  but explicit refs guarantee it works in *any*
+  md renderer.
+- The `[hash][hash]` form is self-documenting —
+  display text matches the ref ID.
+- Cross-service PR refs use the same mechanism:
+  `[github-pr][]` resolves via a ref-link def
+  at the bottom, trivially fillable post-submit.
+
+## Cross-Service PR Placeholder Mechanism
+
+The generated description includes three layers
+of cross-service support, all using native md
+reference-links:
+
+### 1. Metadata comment (top of file)
+
+```markdown
+<!-- pr-msg-meta
+branch: remote_exc_type_registry
+base: main
+submitted:
+  github: ___
+  gitea: ___
+  srht: ___
+-->
+```
+
+A YAML-ish HTML comment block. The `___`
+placeholders get filled with PR/patch numbers
+after submission. Machine-parseable for tooling
+(e.g. `gish`) but invisible in rendered md.
+
+### 2. Cross-references section (in body)
+
+```markdown
+<!--
+### Cross-references
+Also submitted as
+[github-pr][] | [gitea-pr][] | [srht-patch][].
+-->
+```
+
+Commented out at generation time. After submitting
+to multiple services, uncomment and the ref-links
+resolve via the stubs at the bottom.
+
+### 3. Ref-link stubs (bottom of file)
+
+```markdown
+<!-- cross-service pr refs (fill after submit):
+[github-pr]: https://github.com/goodboy/tractor/pull/___
+[gitea-pr]: https://pikers.dev/goodboy/tractor/pulls/___
+[srht-patch]: https://git.sr.ht/~goodboy/tractor/patches/___
+-->
+```
+
+Commented out with `___` number placeholders.
+After submission: uncomment, replace `___` with
+the actual number. Each service-specific copy
+fills in all services' numbers so any copy can
+cross-reference the others.
+
+### Post-submission file layout
+
+```
+pr_msg_LATEST.md                    # latest draft (skill root)
+msgs/
+  20260325T002027Z_mybranch_pr_msg.md  # timestamped
+  github/
+    42_pr_msg.md        # github PR #42
+  gitea/
+    17_pr_msg.md        # gitea PR #17
+  srht/
+    5_pr_msg.md         # srht patch #5
+```
+
+Each `<service>/<num>_pr_msg.md` is a copy with:
+- metadata `submitted:` fields filled in
+- cross-references section uncommented
+- ref-link stubs uncommented with real numbers
+- all services cross-linked in each copy
+
+This mirrors the `gish` skill's
+`<backend>/<num>.md` pattern.
+
+## Commit-Link URL Patterns by Service
+
+| Service   | Pattern                             |
+|-----------|-------------------------------------|
+| GitHub    | `https://github.com/<o>/<r>/commit/<h>` |
+| Gitea     | `https://<host>/<o>/<r>/commit/<h>` |
+| SourceHut | `https://git.sr.ht/~<o>/<r>/commit/<h>` |
+| GitLab    | `https://gitlab.com/<o>/<r>/-/commit/<h>` |
+
+## PR/Patch URL Patterns by Service
+
+| Service   | Pattern                             |
+|-----------|-------------------------------------|
+| GitHub    | `https://github.com/<o>/<r>/pull/<n>` |
+| Gitea     | `https://<host>/<o>/<r>/pulls/<n>`  |
+| SourceHut | `https://git.sr.ht/~<o>/<r>/patches/<n>` |
+| GitLab    | `https://gitlab.com/<o>/<r>/-/merge_requests/<n>` |
+
+## Scope Naming Convention
+
+Use Python namespace-resolution syntax for
+referencing changed code scopes:
+
+| File path                 | Scope reference               |
+|---------------------------|-------------------------------|
+| `tractor/_exceptions.py`  | `tractor._exceptions`         |
+| `tractor/_state.py`       | `tractor._state`              |
+| `tests/test_foo.py`       | `tests.test_foo`              |
+| Function in module        | `tractor._exceptions.func()`  |
+| Method on class           | `.RemoteActorError.src_type`  |
+| Class                     | `tractor._exceptions.RAE`     |
+
+Prefix with the package path for top-level refs;
+use leading-dot shorthand (`.ClassName.method()`)
+for sub-bullets where the parent module is already
+established.
+
+## Title Conventions
+
+Same verb vocabulary as commit messages:
+- `Add` — wholly new feature/API
+- `Fix` — bug fix
+- `Drop` — removal
+- `Use` — adopt new approach
+- `Move`/`Mv` — relocate code
+- `Adjust` — minor tweak
+- `Update` — enhance existing feature
+- `Support` — add support for something
+
+Target 50 chars, hard max 70. Always backtick
+code elements.
+
+## Tone
+
+Casual yet technically precise — matching the
+project's commit-msg style. Terse but every bullet
+carries signal. Use project abbreviations freely
+(msg, bg, ctx, impl, mod, obvi, fn, bc, var,
+prolly, ep, etc.).
+
+---
+
+(this format reference was generated by
+[`claude-code`][claude-code-gh])
+[claude-code-gh]: https://github.com/anthropics/claude-code

.claude/skills/run-tests/SKILL.md

@@ -0,0 +1,632 @@
+---
+name: run-tests
+description: >
+  Run tractor test suite (or subsets). Use when the user wants
+  to run tests, verify changes, or check for regressions.
+argument-hint: "[test-path-or-pattern] [--opts]"
+allowed-tools:
+  - Bash(python -m pytest *)
+  - Bash(python -c *)
+  - Bash(python --version *)
+  - Bash(UV_PROJECT_ENVIRONMENT=py* uv run python *)
+  - Bash(UV_PROJECT_ENVIRONMENT=py* uv run pytest *)
+  - Bash(UV_PROJECT_ENVIRONMENT=py* uv sync *)
+  - Bash(UV_PROJECT_ENVIRONMENT=py* uv pip show *)
+  - Bash(git rev-parse *)
+  - Bash(ls *)
+  - Bash(cat *)
+  - Bash(jq * .pytest_cache/*)
+  # process inspection + SIGINT-first cleanup ladder (see
+  # the zombie-actor pre-flight / teardown steps below).
+  - Bash(ss *)
+  - Bash(pgrep *)
+  - Bash(pkill *)
+  - Bash(sleep *)
+  - Bash(rm -f /tmp/registry@*.sock)
+  - Read
+  - Grep
+  - Glob
+  - Task
+  - AskUserQuestion
+---
+
+Run the `tractor` test suite using `pytest`. Follow this
+process:
+
+## 1. Parse user intent
+
+From the user's message and any arguments, determine:
+
+- **scope**: full suite, specific file(s), specific
+  test(s), or a keyword pattern (`-k`).
+- **transport**: which IPC transport protocol to test
+  against (default: `tcp`, also: `uds`).
+- **options**: any extra pytest flags the user wants
+  (e.g. `--ll debug`, `--tpdb`, `-x`, `-v`).
+
+If the user provides a bare path or pattern as argument,
+treat it as the test target. Examples:
+
+- `/run-tests` → full suite
+- `/run-tests test_local.py` → single file
+- `/run-tests test_registrar -v` → file + verbose
+- `/run-tests -k cancel` → keyword filter
+- `/run-tests tests/ipc/ --tpt-proto uds` → subdir + UDS
+
+## 2. Construct the pytest command
+
+Base command:
+```
+python -m pytest
+```
+
+### Default flags (always include unless user overrides):
+- `-x` (stop on first failure)
+- `--tb=short` (concise tracebacks)
+- `--no-header` (reduce noise)
+
+### Path resolution:
+- If the user gives a bare filename like `test_local.py`,
+  resolve it under `tests/`.
+- If the user gives a subdirectory like `ipc/`, resolve
+  under `tests/ipc/`.
+- Glob if needed: `tests/**/test_*<pattern>*.py`
+
+### Key pytest options for this project:
+
+| Flag | Purpose |
+|---|---|
+| `--ll <level>` | Set tractor log level (e.g. `debug`, `info`, `runtime`) |
+| `--tpdb` / `--debug-mode` | Enable tractor's multi-proc debugger |
+| `--tpt-proto <key>` | IPC transport: `tcp` (default) or `uds` |
+| `--spawn-backend <be>` | Spawn method: `trio` (default), `mp_spawn`, `mp_forkserver` |
+| `-k <expr>` | pytest keyword filter |
+| `-v` / `-vv` | Verbosity |
+| `-s` | No output capture (useful with `--tpdb`) |
+
+### Common combos:
+```sh
+# quick smoke test of core modules
+python -m pytest tests/test_local.py tests/test_rpc.py -x --tb=short --no-header
+
+# full suite, stop on first failure
+python -m pytest tests/ -x --tb=short --no-header
+
+# specific test with debug
+python -m pytest tests/discovery/test_registrar.py::test_reg_then_unreg -x -s --tpdb --ll debug
+
+# run with UDS transport
+python -m pytest tests/ -x --tb=short --no-header --tpt-proto uds
+
+# keyword filter
+python -m pytest tests/ -x --tb=short --no-header -k "cancel and not slow"
+```
+
+## 3. Pre-flight: venv detection (MANDATORY)
+
+**Always verify a `uv` venv is active before running
+`python` or `pytest`.** This project uses
+`UV_PROJECT_ENVIRONMENT=py<MINOR>` naming (e.g.
+`py313`) — never `.venv`.
+
+### Step 1: detect active venv
+
+Run this check first:
+
+```sh
+python -c "
+import sys, os
+venv = os.environ.get('VIRTUAL_ENV', '')
+prefix = sys.prefix
+print(f'VIRTUAL_ENV={venv}')
+print(f'sys.prefix={prefix}')
+print(f'executable={sys.executable}')
+"
+```
+
+### Step 2: interpret results
+
+**Case A — venv is active** (`VIRTUAL_ENV` is set
+and points to a `py<MINOR>/` dir under the project
+root or worktree):
+
+Use bare `python` / `python -m pytest` for all
+commands. This is the normal, fast path.
+
+**Case B — no venv active** (`VIRTUAL_ENV` is empty
+or `sys.prefix` points to a system Python):
+
+Use `AskUserQuestion` to ask the user:
+
+> "No uv venv is active. Should I activate one
+> via `UV_PROJECT_ENVIRONMENT=py<MINOR> uv sync`,
+> or would you prefer to activate your shell venv
+> first?"
+
+Options:
+1. **"Create/sync venv"** — run
+   `UV_PROJECT_ENVIRONMENT=py<MINOR> uv sync` where
+   `<MINOR>` is detected from `python --version`
+   (e.g. `313` for 3.13). Then use
+   `py<MINOR>/bin/python` for all subsequent
+   commands in this session.
+2. **"I'll activate it myself"** — stop and let the
+   user `source py<MINOR>/bin/activate` or similar.
+
+**Case C — inside a git worktree** (`git rev-parse
+--git-common-dir` differs from `--git-dir`):
+
+Verify Python resolves from the **worktree's own
+venv**, not the main repo's:
+
+```sh
+python -c "import tractor; print(tractor.__file__)"
+```
+
+If the path points outside the worktree, create a
+worktree-local venv:
+
+```sh
+UV_PROJECT_ENVIRONMENT=py<MINOR> uv sync
+```
+
+Then use `py<MINOR>/bin/python` for all commands.
+
+**Why this matters**: without the correct venv,
+subprocesses spawned by tractor resolve modules
+from the wrong editable install, causing spurious
+`AttributeError` / `ModuleNotFoundError`.
+
+### Fallback: `uv run`
+
+If the user can't or won't activate a venv, all
+`python` and `pytest` commands can be prefixed
+with `UV_PROJECT_ENVIRONMENT=py<MINOR> uv run`:
+
+```sh
+# instead of: python -m pytest tests/ -x
+UV_PROJECT_ENVIRONMENT=py313 uv run pytest tests/ -x
+
+# instead of: python -c 'import tractor'
+UV_PROJECT_ENVIRONMENT=py313 uv run python -c 'import tractor'
+```
+
+`uv run` auto-discovers the project and venv,
+but is slower than a pre-activated venv due to
+lock-file resolution on each invocation. Prefer
+activating the venv when possible.
+
+### Step 3: import + collection checks
+
+After venv is confirmed, always run these
+(especially after refactors or module moves):
+
+```sh
+# 1. package import smoke check
+python -c 'import tractor; print(tractor)'
+
+# 2. verify all tests collect (no import errors)
+python -m pytest tests/ -x -q --co 2>&1 | tail -5
+```
+
+If either fails, fix the import error before running
+any actual tests.
+
+### Step 4: zombie-actor / stale-registry check (MANDATORY)
+
+The tractor runtime's default registry address is
+**`127.0.0.1:1616`** (TCP) / `/tmp/registry@1616.sock`
+(UDS). Whenever any prior test run — especially one
+using a fork-based backend like `subint_forkserver` —
+leaks a child actor process, that zombie keeps the
+registry port bound and **every subsequent test
+session fails to bind**, often presenting as 50+
+unrelated failures ("all tests broken"!) across
+backends.
+
+**This has to be checked before the first run AND
+after any cancelled/SIGINT'd run** — signal failures
+in the middle of a test can leave orphan children.
+
+```sh
+# 1. TCP registry — any listener on :1616? (primary signal)
+ss -tlnp 2>/dev/null | grep ':1616' || echo 'TCP :1616 free'
+
+# 2. leftover actor/forkserver procs — scoped to THIS
+#    repo's python path, so we don't false-flag legit
+#    long-running tractor-using apps (e.g. `piker`,
+#    downstream projects that embed tractor).
+pgrep -af "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv" \
+  | grep -v 'grep\|pgrep' \
+  || echo 'no leaked actor procs from this repo'
+
+# 3. stale UDS registry sockets
+ls -la /tmp/registry@*.sock 2>/dev/null \
+  || echo 'no leaked UDS registry sockets'
+```
+
+**Interpretation:**
+
+- **TCP :1616 free AND no stale sockets** → clean,
+  proceed. The actor-procs probe is secondary — false
+  positives are common (piker, any other tractor-
+  embedding app); only cleanup if `:1616` is bound or
+  sockets linger.
+- **TCP :1616 bound OR stale sockets present** →
+  surface PIDs + cmdlines to the user, offer cleanup:
+
+  ```sh
+  # 1. GRACEFUL FIRST (tractor is structured concurrent — it
+  #    catches SIGINT as an OS-cancel in `_trio_main` and
+  #    cascades Portal.cancel_actor via IPC to every descendant.
+  #    So always try SIGINT first with a bounded timeout; only
+  #    escalate to SIGKILL if graceful cleanup doesn't complete).
+  pkill -INT -f "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv"
+
+  # 2. bounded wait for graceful teardown (usually sub-second).
+  #    Loop until the processes exit, or timeout. Keep the
+  #    bound tight — hung/abrupt-killed descendants usually
+  #    hang forever, so don't wait more than a few seconds.
+  for i in $(seq 1 10); do
+    pgrep -f "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv" >/dev/null || break
+    sleep 0.3
+  done
+
+  # 3. ESCALATE TO SIGKILL only if graceful didn't finish.
+  if pgrep -f "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv" >/dev/null; then
+    echo 'graceful teardown timed out — escalating to SIGKILL'
+    pkill -9 -f "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv"
+  fi
+
+  # 4. if a test zombie holds :1616 specifically and doesn't
+  #    match the above pattern, find its PID the hard way:
+  ss -tlnp 2>/dev/null | grep ':1616'   # prints `users:(("<name>",pid=NNNN,...))`
+  # then (same SIGINT-first ladder):
+  # kill -INT <NNNN>; sleep 1; kill -9 <NNNN> 2>/dev/null
+
+  # 5. remove stale UDS sockets
+  rm -f /tmp/registry@*.sock
+
+  # 6. re-verify
+  ss -tlnp 2>/dev/null | grep ':1616' || echo 'TCP :1616 now free'
+  ```
+
+**Never ignore stale registry state.** If you see the
+"all tests failing" pattern — especially
+`trio.TooSlowError` / connection refused / address in
+use on many unrelated tests — check registry **before**
+spelunking into test code. The failure signature will
+be identical across backends because they're all
+fighting for the same port.
+
+**False-positive warning for step 2:** a plain
+`pgrep -af '_actor_child_main'` will also match
+legit long-running tractor-embedding apps (e.g.
+`piker` at `~/repos/piker/py*/bin/python3 -m
+tractor._child ...`). Always scope to the current
+repo's python path, or only use step 1 (`:1616`) as
+the authoritative signal.
+
+## 4. Run and report
+
+- Run the constructed command.
+- Use a timeout of **600000ms** (10min) for full suite
+  runs, **120000ms** (2min) for single-file runs.
+- If the suite is large (full `tests/`), consider running
+  in the background and checking output when done.
+- Use `--lf` (last-failed) to re-run only previously
+  failing tests when iterating on a fix.
+
+### On failure:
+- Show the failing test name(s) and short traceback.
+- If the failure looks related to recent changes, point
+  out the likely cause and suggest a fix.
+- **Check the known-flaky list** (section 8) before
+  investigating — don't waste time on pre-existing
+  timeout issues.
+- **NEVER auto-commit fixes.** If you apply a code fix
+  during test iteration, leave it unstaged. Tell the
+  user what changed and suggest they review the
+  worktree state, stage files manually, and use
+  `/commit-msg` (inline or in a separate session) to
+  generate the commit message. The human drives all
+  `git add` and `git commit` operations.
+
+### On success:
+- Report the pass/fail/skip counts concisely.
+
+## 5. Test directory layout (reference)
+
+```
+tests/
+├── conftest.py          # root fixtures, daemon, signals
+├── devx/                # debugger/tooling tests
+├── ipc/                 # transport protocol tests
+├── msg/                 # messaging layer tests
+├── discovery/           # discovery subsystem tests
+│   ├── test_multiaddr.py  # multiaddr construction
+│   └── test_registrar.py  # registry/discovery protocol
+├── test_local.py        # registrar + local actor basics
+├── test_rpc.py          # RPC error handling
+├── test_spawning.py     # subprocess spawning
+├── test_multi_program.py  # multi-process tree tests
+├── test_cancellation.py # cancellation semantics
+├── test_context_stream_semantics.py  # ctx streaming
+├── test_inter_peer_cancellation.py   # peer cancel
+├── test_infected_asyncio.py  # trio-in-asyncio
+└── ...
+```
+
+## 6. Change-type → test mapping
+
+After modifying specific modules, run the corresponding
+test subset first for fast feedback:
+
+| Changed module(s) | Run these tests first |
+|---|---|
+| `runtime/_runtime.py`, `runtime/_state.py` | `test_local.py test_rpc.py test_spawning.py test_root_runtime.py` |
+| `discovery/` (`_registry`, `_discovery`, `_addr`) | `tests/discovery/ test_multi_program.py test_local.py` |
+| `_context.py`, `_streaming.py` | `test_context_stream_semantics.py test_advanced_streaming.py` |
+| `ipc/` (`_chan`, `_server`, `_transport`) | `tests/ipc/ test_2way.py` |
+| `runtime/_portal.py`, `runtime/_rpc.py` | `test_rpc.py test_cancellation.py` |
+| `spawn/` (`_spawn`, `_entry`) | `test_spawning.py test_multi_program.py` |
+| `devx/debug/` | `tests/devx/test_debugger.py` (slow!) |
+| `to_asyncio.py` | `test_infected_asyncio.py test_root_infect_asyncio.py` |
+| `msg/` | `tests/msg/` |
+| `_exceptions.py` | `test_remote_exc_relay.py test_inter_peer_cancellation.py` |
+| `runtime/_supervise.py` | `test_cancellation.py test_spawning.py` |
+
+## 7. Quick-check shortcuts
+
+### After refactors (fastest first-pass):
+```sh
+# import + collect check
+python -c 'import tractor' && python -m pytest tests/ -x -q --co 2>&1 | tail -3
+
+# core subset (~10s)
+python -m pytest tests/test_local.py tests/test_rpc.py tests/test_spawning.py tests/discovery/test_registrar.py -x --tb=short --no-header
+```
+
+### Inspect last failures (without re-running):
+
+When the user asks "what failed?", "show failures",
+or wants to check the last-failed set before
+re-running — read the pytest cache directly. This
+is instant and avoids test collection overhead.
+
+```sh
+python -c "
+import json, pathlib, sys
+p = pathlib.Path('.pytest_cache/v/cache/lastfailed')
+if not p.exists():
+    print('No lastfailed cache found.'); sys.exit()
+data = json.loads(p.read_text())
+# filter to real test node IDs (ignore junk
+# entries that can accumulate from system paths)
+tests = sorted(k for k in data if k.startswith('tests/'))
+if not tests:
+    print('No failures recorded.')
+else:
+    print(f'{len(tests)} last-failed test(s):')
+    for t in tests:
+        print(f'  {t}')
+"
+```
+
+**Why not `--cache-show` or `--co --lf`?**
+
+- `pytest --cache-show 'cache/lastfailed'` works
+  but dumps raw dict repr including junk entries
+  (stale system paths that leak into the cache).
+- `pytest --co --lf` actually *collects* tests which
+  triggers import resolution and is slow (~0.5s+).
+  Worse, when cached node IDs don't exactly match
+  current parametrize IDs (e.g. param names changed
+  between runs), pytest falls back to collecting
+  the *entire file*, giving false positives.
+- Reading the JSON directly is instant, filterable
+  to `tests/`-prefixed entries, and shows exactly
+  what pytest recorded — no interpretation.
+
+**After inspecting**, re-run the failures:
+```sh
+python -m pytest --lf -x --tb=short --no-header
+```
+
+### Full suite in background:
+When core tests pass and you want full coverage while
+continuing other work, run in background:
+```sh
+python -m pytest tests/ -x --tb=short --no-header -q
+```
+(use `run_in_background=true` on the Bash tool)
+
+## 8. Known flaky tests
+
+These tests have **pre-existing** timing/environment
+sensitivity. If they fail with `TooSlowError` or
+pexpect `TIMEOUT`, they are almost certainly NOT caused
+by your changes — note them and move on.
+
+| Test | Typical error | Notes |
+|---|---|---|
+| `devx/test_debugger.py::test_multi_nested_subactors_error_through_nurseries` | pexpect TIMEOUT | Debugger pexpect timing |
+| `test_cancellation.py::test_cancel_via_SIGINT_other_task` | TooSlowError | Signal handling race |
+| `test_inter_peer_cancellation.py::test_peer_spawns_and_cancels_service_subactor` | TooSlowError | Async timing (both param variants) |
+| `test_docs_examples.py::test_example[we_are_processes.py]` | `assert None == 0` | `__main__` missing `__file__` in subproc |
+
+**Rule of thumb**: if a test fails with `TooSlowError`,
+`trio.TooSlowError`, or `pexpect.TIMEOUT` and you didn't
+touch the relevant code path, it's flaky — skip it.
+
+## 9. The pytest-capture hang pattern (CHECK THIS FIRST)
+
+**Symptom:** a tractor test hangs indefinitely under
+default `pytest` but passes instantly when you add
+`-s` (`--capture=no`).
+
+**Cause:** tractor subactors (especially under fork-
+based backends) inherit pytest's stdout/stderr
+capture pipes via fds 1,2. Under high-volume error
+logging (e.g. multi-level cancel cascade, nested
+`run_in_actor` failures, anything triggering
+`RemoteActorError` + `ExceptionGroup` traceback
+spew), the **64KB Linux pipe buffer fills** faster
+than pytest drains it. Subactor writes block → can't
+finish exit → parent's `waitpid`/pidfd wait blocks →
+deadlock cascades up the tree.
+
+**Pre-existing guards in the tractor harness** that
+encode this same knowledge — grep these FIRST
+before spelunking:
+
+- `tests/conftest.py:258-260` (in the `daemon`
+  fixture): `# XXX: too much logging will lock up
+  the subproc (smh)` — downgrades `trace`/`debug`
+  loglevel to `info` to prevent the hang.
+- `tests/conftest.py:316`: `# can lock up on the
+  _io.BufferedReader and hang..` — noted on the
+  `proc.stderr.read()` post-SIGINT.
+
+**Debug recipe (in priority order):**
+
+1. **Try `-s` first.** If the hang disappears with
+   `pytest -s`, you've confirmed it's capture-pipe
+   fill. Skip spelunking.
+2. **Lower the loglevel.** Default `--ll=error` on
+   this project; if you've bumped it to `debug` /
+   `info`, try dropping back. Each log level
+   multiplies pipe-pressure under fault cascades.
+3. **If you MUST use default capture + high log
+   volume**, redirect subactor stdout/stderr in the
+   child prelude (e.g.
+   `tractor.spawn._subint_forkserver._child_target`
+   post-`_close_inherited_fds`) to `/dev/null` or a
+   file.
+
+**Signature tells you it's THIS bug (vs. a real
+code hang):**
+
+- Multi-actor test under fork-based backend
+  (`subint_forkserver`, eventually `trio_proc` too
+  under enough log volume).
+- Multiple `RemoteActorError` / `ExceptionGroup`
+  tracebacks in the error path.
+- Test passes with `-s` in the 5-10s range, hangs
+  past pytest-timeout (usually 30+ s) without `-s`.
+- Subactor processes visible via `pgrep -af
+  subint-forkserv` or similar after the hang —
+  they're alive but blocked on `write()` to an
+  inherited stdout fd.
+
+**Historical reference:** this deadlock cost a
+multi-session investigation (4 genuine cascade
+fixes landed along the way) that only surfaced the
+capture-pipe issue AFTER the deeper fixes let the
+tree actually tear down enough to produce pipe-
+filling log volume. Full post-mortem in
+`ai/conc-anal/subint_forkserver_test_cancellation_leak_issue.md`.
+Lesson codified here so future-me grep-finds the
+workaround before digging.
+
+## 10. Reaping zombie subactors (`tractor-reap`)
+
+**Symptom:** after a `pytest` run crashes, times out,
+or is `Ctrl+C`'d, subactor forks (esp. under
+`subint_forkserver`) can be reparented to `init`
+(PPid==1) and linger. They hold onto ports, inherit
+pytest's capture-pipe fds, and flakify later
+sessions.
+
+**Two layers of defense:**
+
+### a) Session-scoped auto-fixture (always on)
+
+`tractor/_testing/pytest.py::_reap_orphaned_subactors`
+runs at pytest session teardown. It walks `/proc` for
+direct descendants of the pytest pid, SIGINTs them,
+waits up to 3s, then SIGKILLs survivors. SC-polite:
+gives the subactor runtime a chance to run its trio
+cancel shield + IPC teardown before escalation.
+
+This is *autouse* and session-scoped — you don't need
+to do anything. It just runs.
+
+### b) `scripts/tractor-reap` CLI (manual reap)
+
+For the **pytest-died-mid-session** case (Ctrl+C, OOM
+kill, hung process you had to `kill -9`), the fixture
+never ran. Reach for the CLI:
+
+```sh
+# default: orphans (PPid==1, cwd==repo, cmd contains python)
+scripts/tractor-reap
+
+# descendant-mode: from a still-live supervisor
+scripts/tractor-reap --parent <pytest-pid>
+
+# see what would be reaped, don't signal
+scripts/tractor-reap -n
+
+# tune the SIGINT → SIGKILL grace window
+scripts/tractor-reap --grace 5
+```
+
+Exit code: `0` if everyone exited on SIGINT, `1` if
+SIGKILL had to escalate — so you can chain it in CI
+health-checks (`scripts/tractor-reap || <alert>`).
+
+**What it matches** (orphan-mode):
+- `PPid == 1` (reparented to init → definitely
+  orphaned, not just a currently-running child)
+- `cwd == <repo-root>` (keeps the sweep scoped; won't
+  touch unrelated init-children elsewhere)
+- `python` in cmdline
+
+**What it does not do:** kill anything whose PPid is
+still a live tractor parent. If the parent is alive
+it's not an orphan; use `--parent <pid>` if you need
+to force-reap under a still-live supervisor.
+
+**When NOT to run it:** while a pytest session is
+active in another terminal. It's safe (won't touch
+that session's live children in orphan-mode) but can
+race if the target session is mid-teardown.
+
+### c) `--shm` / `--shm-only`: orphan-segment sweep
+
+Because `tractor.ipc._mp_bs.disable_mantracker()`
+turns off `mp.resource_tracker` (see
+`ai/conc-anal/subint_forkserver_mp_shared_memory_issue.md`),
+a hard-crashing actor can leave `/dev/shm/<key>`
+segments behind that nothing else GCs.
+
+```sh
+# process reap THEN shm sweep
+scripts/tractor-reap --shm
+
+# shm sweep only (skip process phase)
+scripts/tractor-reap --shm-only
+
+# dry-run: list candidates, don't unlink
+scripts/tractor-reap --shm -n
+```
+
+**Match criteria** (very conservative — this is a
+shared-system path, can't be wrong):
+- segment is a regular file under `/dev/shm`,
+- owned by the **current uid** (`stat.st_uid`),
+- AND **no live process holds it open** —
+  enumerated by walking every readable
+  `/proc/<pid>/maps` (post-mmap mappings) AND
+  `/proc/<pid>/fd/*` (pre-mmap shm-opened fds).
+
+The "nobody has it open" check is the
+kernel-canonical "is this leaked?" test — same
+answer `lsof /dev/shm/<key>` would give. No
+reliance on tractor-specific naming, so it works
+for any tractor app. Critically, it WILL NOT touch
+segments held by other apps you have running
+(e.g. `piker`, `lttng-ust-*`, `aja-shm-*` —
+verified locally with 81 in-use segments correctly
+preserved).

.github/workflows/ci.yml

@@ -1,10 +1,18 @@
 name: CI
 
+# NOTE distilled from,
+# https://github.com/orgs/community/discussions/26276
 on:
-  # any time someone pushes a new branch to origin
+  # any time a new update to 'main'
   push:
+    branches:
+      - main
 
-  # Allows you to run this workflow manually from the Actions tab
+  # for on all (forked) PRs to repo
+  # NOTE, use a draft PR if you just want CI triggered..
+  pull_request:
+
+  # to run workflow manually from the "Actions" tab
   workflow_dispatch:
 
 jobs:
@@ -29,7 +37,12 @@ jobs:
         run: uv build --sdist --python=3.13
 
       - name: Install sdist from .tar.gz
-        run: python -m pip install dist/*.tar.gz
+        # XXX must install under py3.13 (matching the build's
+        # `--python=3.13`); the runner's default `python` is 3.12
+        # which our `requires-python = ">=3.13"` now rejects.
+        run: |
+          uv venv --python 3.13
+          uv pip install dist/*.tar.gz
 
   # ------ type-check ------
   # mypy:
@@ -74,24 +87,81 @@ jobs:
   #       run: mypy tractor/ --ignore-missing-imports --show-traceback
 
 
-  testing-linux:
-    name: '${{ matrix.os }} Python ${{ matrix.python }} - ${{ matrix.spawn_backend }}'
-    timeout-minutes: 10
+  testing:
+    name: '${{ matrix.os }} Python${{ matrix.python-version }} spawn_backend=${{ matrix.spawn_backend }} tpt_proto=${{ matrix.tpt_proto }} capture=${{ matrix.capture }}'
+    timeout-minutes: 20
     runs-on: ${{ matrix.os }}
 
+    # NOTE on the matrix shape — the `capture=` mode follows
+    # `spawn_backend`:
+    #
+    # - `trio` / `mp_*` backends use `--capture=fd` (default)
+    #   for per-test attribution of subactor *raw-fd* output
+    #   in failure reports.
+    # - Fork-based backends (`main_thread_forkserver`,
+    #   `subint_forkserver`) REQUIRE `--capture=sys` because
+    #   fork-child × `--capture=fd` is a known deadlock
+    #   pattern. See the long NOTE in `tractor._testing.pytest`'s
+    #   `pytest_load_initial_conftests` for the mechanism +
+    #   tradeoff write-up.
+    #
+    # If a future matrix row adds a fork-spawn backend
+    # WITHOUT setting `capture: 'sys'`, the
+    # `pytest_load_initial_conftests` hook fail-fasts on `CI=1`
+    # with a clear error msg. So the matrix is self-policing.
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
-        python-version: ['3.13']
+        os: [
+          ubuntu-latest,
+          macos-latest,
+        ]
+        python-version: [
+          '3.13',
+          # '3.14',
+        ]
         spawn_backend: [
           'trio',
           # 'mp_spawn',
           # 'mp_forkserver',
+          # ?TODO^ is it worth it to get these running again?
+          #
+          # - [ ] next-gen backends, on 3.13+
+          #   https://github.com/goodboy/tractor/issues/379
+          # 'subinterpreter',
+          # 'subint',
+        ]
+        tpt_proto: [
+          'tcp',
+          'uds',
+        ]
+        capture: [
+          'fd',  # default for non-fork backends
         ]
 
-    steps:
+        # Fork-based backends — added via `include:` so each
+        # cell carries its REQUIRED `capture: 'sys'` mode.
+        # Linux-only for now; macOS coverage TBD pending
+        # local validation.
+        include:
+          - os: ubuntu-latest
+            python-version: '3.13'
+            spawn_backend: 'main_thread_forkserver'
+            tpt_proto: 'tcp'
+            capture: 'sys'
+          - os: ubuntu-latest
+            python-version: '3.13'
+            spawn_backend: 'main_thread_forkserver'
+            tpt_proto: 'uds'
+            capture: 'sys'
 
+        # https://github.com/orgs/community/discussions/26253#discussioncomment-3250989
+        exclude:
+          # don't do UDS run on macOS (for now)
+          - os: macos-latest
+            tpt_proto: 'uds'
+
+    steps:
       - uses: actions/checkout@v4
 
       - name: 'Install uv + py-${{ matrix.python-version }}'
@@ -118,7 +188,18 @@ jobs:
         run: uv tree
 
       - name: Run tests
-        run: uv run pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rsx
+        run: >
+          uv run
+          pytest
+          tests/
+          -rsx
+          --spawn-backend=${{ matrix.spawn_backend }}
+          --tpt-proto=${{ matrix.tpt_proto }}
+          --capture=${{ matrix.capture }}
+        # NOTE: capture mode is matrix-driven — `fd` for
+        # non-fork backends (per-test fd attribution),
+        # `sys` for fork-based (avoids fork-child x
+        # capture-fd deadlock). See matrix-NOTE above.
 
   # XXX legacy NOTE XXX
   #

.github/workflows/docs.yml

@@ -0,0 +1,63 @@
+name: docs
+
+# build sphinx docs on every PR + push to main;
+# deploy to gh-pages only from main pushes.
+# (see goodboy/tractor#123 for the original ask)
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  # to run workflow manually from the "Actions" tab
+  workflow_dispatch:
+
+# needed by actions/deploy-pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    name: 'sphinx build'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install latest uv
+        uses: astral-sh/setup-uv@v6
+
+      # NOTE, no `d2` bin is installed in CI (yet) so
+      # the pre-rendered + committed SVGs under
+      # `docs/_diagrams/` are used as-is; see
+      # `docs/_ext/d2diagrams.py` for the fallback
+      # policy.
+      - name: Build html docs
+        run: |
+          uv sync --no-dev --group docs
+          uv run --no-dev --group docs make -C docs html
+
+      - name: Upload pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/_build/html
+
+  deploy:
+    name: 'deploy to gh-pages'
+    if: ${{ github.ref == 'refs/heads/main' && github.event_name == 'push' }}
+    needs: build
+    # serialize deploys but NEVER cancel an in-flight one
+    # mid-upload; queue the next instead (scoped to this job so
+    # PR builds can't cancel a production deploy).
+    concurrency:
+      group: 'pages'
+      cancel-in-progress: false
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -102,3 +102,69 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+# all files under
+.git/
+
+# require very explicit staging for anything we **really**
+# want put/kept in repo.
+notes_to_self/
+snippets/
+
+# ------- AI shiz -------
+# `ai.skillz` symlinks,
+# (machine-local, deploy via deploy-skill.sh)
+.claude/skills/py-codestyle
+.claude/skills/close-wkt
+.claude/skills/plan-io
+.claude/skills/prompt-io
+.claude/skills/resolve-conflicts
+.claude/skills/inter-skill-review
+
+# /open-wkt specifics
+.claude/skills/open-wkt
+.claude/wkts/
+claude_wkts
+
+# /code-review-changes specifics
+.claude/skills/code-review-changes
+# review-skill ephemeral ctx (per-PR, single-use)
+.claude/review_context.md
+.claude/review_regression.md
+
+# /pr-msg specifics
+.claude/skills/pr-msg/*
+# repo-specific
+!.claude/skills/pr-msg/format-reference.md
+# XXX, so u can nvim-telescope this file.
+# !.claude/skills/pr-msg/pr_msg_LATEST.md
+
+# /commit-msg specifics
+# - any commit-msg gen tmp files
+.claude/*_commit_*.md
+.claude/*_commit*.txt
+.claude/skills/commit-msg/*
+!.claude/skills/commit-msg/style-duie-reference.md
+
+# use prompt-io instead?
+.claude/plans
+
+# nix develop --profile .nixdev
+.nixdev*
+
+# :Obsession .
+Session.vim
+
+# `gish` local `.md`-files
+# TODO? better all around automation!
+# -[ ] it'd be handy to also commit and sync with wtv git service?
+# -[ ] everything should be put under a `.gish/` no?
+gitea/
+gh/
+
+# ------ macOS ------
+# Finder metadata
+**/.DS_Store
+
+# LLM conversations that should remain private
+docs/conversations/

NEWS.rst

@@ -78,6 +78,7 @@ Bug Fixes
   for ``asyncio``-side errors to not propagate due to a race condition.
 
   The implementation fix summary is:
+
   - add state to signal the end of the ``trio`` side task to be
     read by the ``asyncio`` side and always cancel any ongoing
     task in such cases.

ai/conc-anal/cancel_cascade_too_slow_under_main_thread_forkserver_issue.md

@@ -0,0 +1,314 @@
+# Cancel-cascade `trio.TooSlowError` flakes under `main_thread_forkserver`
+
+## Symptom
+
+Running the full test suite under
+
+```bash
+./py313/bin/python -m pytest tests/ \
+  --tpt-proto=tcp \
+  --spawn-backend=main_thread_forkserver
+```
+
+surfaces a single, **rotating** `trio.TooSlowError`
+failure each run. The failure isn't deterministic on
+test identity — different test each run — but it
+ALWAYS looks like:
+
+```
+FAILED tests/<file>::test_<name> - trio.TooSlowError
+==== 1 failed, 373 passed, 17 skipped, 11–12 xfailed,
+       0–1 xpassed, ~550 warnings in ~6min ====
+```
+
+Pass rate: **~99.7%** (373 of 374 non-skip tests).
+Wall-clock per full run: 5–6 min.
+
+## Tests observed flaking so far
+
+Each row was the SOLE failure in a separate run:
+
+| run # | test |
+|---|---|
+| 1 | `tests/test_advanced_streaming.py::test_dynamic_pub_sub[KeyboardInterrupt]` |
+| 2 | `tests/test_infected_asyncio.py::test_context_spawns_aio_task_that_errors[parent_actor_cancels_child=False]` |
+
+Both share the same shape:
+
+- **Cancel cascade** of N subactors back to a parent root actor.
+- N ≥ `multiprocessing.cpu_count()` for `test_dynamic_pub_sub`
+  (it spawns `cpus - 1` consumers + publisher + dynamic-consumer).
+- N ≈ 2 for `test_context_spawns_aio_task_that_errors` —
+  but each subactor is `infect_asyncio=True`, so each
+  cancel involves the trio↔asyncio guest-run unwind
+  which is structurally heavier than pure-trio.
+- Test wraps the cascade in `trio.fail_after(N seconds)`
+  and the cap fires before the cascade completes.
+
+The exact failing test rotates because each test is
+independently close to the cap; whichever happens to
+be unlucky in scheduling/CPU-contention on a given run
+is the one that times out.
+
+## Root-cause family
+
+`hard_kill` (`tractor/spawn/_spawn.py:hard_kill`) runs
+the SC-graceful teardown ladder per subactor:
+
+1. `Portal.cancel_actor()` — graceful IPC cancel-req.
+2. Wait `terminate_after=1.6s` for sub to exit.
+3. If still alive: `proc.kill()` (SIGKILL).
+4. (NEW) `_unlink_uds_bind_addrs()` — post-mortem
+   sock-file cleanup for UDS leaks (issue #452 fix).
+
+For a cascade of N subactors, each pays steps 1–4. If
+graceful-cancel doesn't complete within 1.6s for ANY
+sub, that sub eats a full 1.6s of `move_on_after` plus
+the `proc.wait()` post-SIGKILL.
+
+Worst case under fork backend with N=cpus subs:
+- N × 1.6s = 16s+ on a 10-core box just for the
+  graceful timeout phase
+- Plus per-spawn fork-IPC handshake cost compounds
+  during teardown (each sub's IPC cleanup goes through
+  the same forkserver coordinator)
+- Plus the new autouse fixtures
+  (`_track_orphaned_uds_per_test`,
+  `_detect_runaway_subactors_per_test`,
+  `_reap_orphaned_subactors`) all run at test
+  teardown, adding small (10s of ms) but cumulative
+  overhead
+
+Current cap: 30s (`fail_after_s = 30 if
+is_forking_spawner else 12`). Empirically fits the
+median run but the tail breaks ~0.3% of the time.
+
+## NOT regressing
+
+To confirm this is a flake and not a regression:
+
+- Pre-`WakeupSocketpair`-patch baseline: tests
+  HUNG INDEFINITELY (busy-loop never released).
+- Post-patch: pass-or-fail-fast, ~99.7% pass, the
+  occasional cap-hit fails in bounded time (<60s for
+  the offending test).
+- Same test PASSES under `--spawn-backend=trio`
+  (no fork, no hard-kill compounding).
+
+So the suite is dramatically better than before; the
+remaining flake is a known-tolerable steady-state.
+
+## Possible mitigations (ranked)
+
+### A. Bump the cap further
+
+Cheapest. Change the per-test `fail_after_s` from 30
+to e.g. 60 for fork backends. Pros: trivial. Cons:
+masks any genuine slowness regression we'd want to
+catch.
+
+### B. CPU-count-aware cap
+
+For tests whose N scales with `cpu_count()`, scale
+the cap too:
+
+```python
+fail_after_s = (
+    max(30, cpu_count() * 3)  # 3s/actor floor
+    if is_forking_spawner
+    else 12
+)
+```
+
+Pros: scales with the actual cancel-cascade work.
+Cons: still arbitrary multiplier.
+
+### C. `pytest-rerunfailures` for these tests only
+
+Mark the known-flaky tests with
+`@pytest.mark.flaky(reruns=1)` (needs
+`pytest-rerunfailures` dep). Single retry hides
+genuine ~0.3% transient flakes.
+
+Pros: no cap change, surfaces persistent failures
+loudly. Cons: adds a dep, retries can mask real bugs
+if used widely.
+
+### D. Reduce `hard_kill`'s `terminate_after`
+
+Drop from 1.6s → 0.8s. Cuts the worst-case cascade
+time roughly in half. Risks: fewer subs get a chance
+to run their cleanup before SIGKILL → more orphaned
+state for the autouse reapers to handle (ironically,
+adds back overhead elsewhere).
+
+### E. Profile + targeted fix
+
+Add `log.devx()` markers in `hard_kill` to time each
+phase. Identify if any subactor is consistently
+hitting the 1.6s cap (vs. exiting in <0.1s). If so,
+that sub has a teardown bug worth fixing at source.
+Pros: actually fixes the underlying slowness. Cons:
+real investigation work, deferred from this round.
+
+## Recommendation
+
+Land this issue-doc as the tracker. Apply **(B)** as
+a small follow-up — cheap and proportional. If it
+still flakes, escalate to **(E)** with a `log.devx()`
+profile-pass.
+
+`(C)` is a backstop if `(B)` doesn't quite get there
+and we need green CI faster than (E) can deliver.
+
+## Verification protocol
+
+After applying any mitigation:
+
+```bash
+# Run the suite N times back-to-back, count failures.
+# A persistent failure on the SAME test == real bug.
+# Failures rotating across tests == still cap-related.
+
+for i in $(seq 1 5); do
+  ./py313/bin/python -m pytest tests/ \
+    --tpt-proto=tcp \
+    --spawn-backend=main_thread_forkserver \
+    -q 2>&1 | tail -2
+done
+```
+
+Target: 0 failures across 5 runs ⇒ ship. 1–2 failures
+still rotating ⇒ apply (C). Same test failing twice
+⇒ escalate to (E).
+
+## Snapshot evidence (2026-05-13)
+
+After landing the `fail_after_w_trace` /
+`afk_alarm_w_trace` capture-on-timeout helpers
+(`tractor._testing.trace`), `test_nested_multierrors`
+on the `main_thread_forkserver` backend produces
+**reproducible diag snapshots** at
+`$XDG_CACHE_HOME/tractor/hung-dumps/test_nested_multierrors_start_method_main_thread_forkserver__<iso-ts>/`.
+
+### Reproduction
+
+```bash
+pytest \
+  -v --verbose --durations=10 \
+  --spawn-backend=main_thread_forkserver \
+  --tpt-proto=uds \
+  --capture=sys --show-capture=stderr -rxX \
+  tests/test_cancellation.py::test_nested_multierrors
+```
+
+The test is `xfail(strict=False)` for MTF — it RUNS
+each invocation so snapshots accumulate, but doesn't
+break `--lf` workflow.
+
+### Consistent shape across runs
+
+5+ snapshots taken back-to-back show the SAME pattern:
+
+- **Timing:** ~10s wall-clock total. Inner
+  `fail_after_w_trace(10)` fires at exactly T=10s;
+  cascade's `nursery.__aexit__` takes ~0.6s more to
+  gather + propagate the resulting
+  `BaseExceptionGroup`. **Trio backend completes the
+  SAME test in <6s** — so the MTF cascade is ~2x
+  slower at minimum.
+
+- **`BaseExceptionGroup` shape:** mixed
+  `[RemoteActorError, Cancelled]`. The first
+  subactor's natural error-propagation (`assert 0`
+  raised → `RemoteActorError` portal-result)
+  arrives before T=10s; the OTHER subactor's
+  portal-wait is still in flight at T=10s, gets
+  cancelled by `fail_after_w_trace`'s scope-cancel
+  → returns `Cancelled` instead.
+
+- **Orphan-spawn skew:** snapshot's `orphans` bucket
+  (after the `_is_tractor_subactor` cgroup-slice
+  override fix) consistently shows 2-4 init-adopted
+  procs at `depth_3` and `depth_1` levels — these
+  are the leaves whose parent (`depth_2` spawner)
+  was killed mid-cascade but who hadn't yet seen
+  the cancel signal themselves.
+
+- **UDS sock-leak:** 2-6 dead-orphan socks per run
+  (varies with cascade timing). The
+  `track_orphaned_uds_per_test` fixture reaps them
+  post-test → contamination is isolated per-invocation.
+
+### Capture mechanism
+
+`fail_after_w_trace` covers two firing paths:
+
+1. **`trio.TooSlowError`** raised at scope-exit
+   (body returned cleanly past deadline) — direct
+   `except` handler captures.
+
+2. **Scope-cancel + body raises non-`Cancelled` exc**
+   (e.g. `nursery.__aexit__` wraps timeout-induced
+   `Cancelled` into a `BaseExceptionGroup` that
+   escapes before `trio.fail_after`'s exit-check
+   could fire `TooSlowError`) — body-raise `except`
+   handler checks `scope.cancel_called` and
+   captures if True. This path catches the
+   `test_nested_multierrors` shape specifically (see
+   "BaseExceptionGroup shape" above).
+
+The snapshot dir contains:
+- `trace.txt` — `ptree` + `hung_state` (kernel
+  `wchan`/`stack` + `py-spy dump --locals` when
+  sudo cached), with `include_strays=True`
+  surfacing any cross-test ghost subactor trees in
+  the `orphans` bucket.
+- `bindspace.txt` — UDS bindspace classification
+  (live-active / orphaned-alive / orphaned-dead).
+- `meta.json` — `{pid, label, captured_at, sudo_cached}`.
+
+The end-of-session `pytest_terminal_summary` hook
+in `tractor._testing.pytest` lists every snapshot
+dir from the run so you don't have to scroll back
+through captured-stderr lines:
+
+```
+========================= tractor hang-snapshot index ==========================
+N `fail_after_w_trace` / `afk_alarm_w_trace` snapshot(s) captured this session:
+  <test-id>
+    → /home/.../.cache/tractor/hung-dumps/<label>__<ts>
+```
+
+### Caveats
+
+The snapshot fires AFTER the body-raise (not at the
+exact moment of scope-cancel), so the parent's
+py-spy frames show `_do_capture_snapshot` itself
+running, NOT the cancel-cascade hang frame. To see
+the actual hang state, manual `acli.ptree` /
+`acli.hung_dump` from a second terminal at T=10s
+would be needed — **not currently possible**
+because per-test reaper fixtures clean up ~0.6s
+post-timeout. See follow-up TODO in
+`tractor/_testing/trace.py` for a
+`TRACTOR_TRACE_HOLD=1` env-var pause mode.
+
+## See also
+
+- [#452](https://github.com/goodboy/tractor/issues/452) —
+  UDS sock-file leak (related — `hard_kill`'s
+  cleanup phase contributes to cascade time)
+- `ai/conc-anal/trio_wakeup_socketpair_busy_loop_under_fork_issue.md`
+  — the upstream-trio fix that turned this from a
+  100% hang into a 0.3% flake
+- `ai/conc-anal/infected_asyncio_under_main_thread_forkserver_hang_issue.md`
+  — the asyncio variant which contributes to one of
+  the rotating failures
+- `tractor/spawn/_spawn.py::hard_kill` — the SIGKILL
+  cascade source
+- `tractor/_testing/_reap.py::_track_orphaned_uds_per_test`,
+  `_detect_runaway_subactors_per_test`,
+  `_reap_orphaned_subactors` — autouse cleanup
+  fixtures whose cumulative teardown overhead
+  contributes to the cascade time

ai/conc-anal/fork_thread_semantics_execution_vs_memory.md

@@ -0,0 +1,281 @@
+# `fork()` in a multi-threaded program — execution-side vs. memory-side of the same coin
+
+A reference doc for readers who've encountered one of two
+opposite-sounding framings of POSIX `fork()` semantics in a
+multi-threaded program and are confused by the other.
+
+This is a sibling to
+`subint_fork_blocked_by_cpython_post_fork_issue.md` — that
+doc covers a CPython-level refusal of fork-from-subint;
+this one covers the more general POSIX layer, since
+tractor's main-thread forkserver design rests on it.
+
+## TL;DR
+
+POSIX `fork()` only preserves the *calling* thread as a
+runnable thread in the child — every other thread in the
+parent simply never executes another instruction in the
+child. trio's docs call this "leaked"; tractor's
+`_main_thread_forkserver.py` docstring calls it "gone".
+Both are correct: "gone" is the *execution* side (no
+scheduler entry, no instructions retired), "leaked" is the
+*memory* side (the dead threads' stacks and per-thread
+heap structures still ride into the child's address space
+as orphaned COW pages with no owner and no cleanup hook).
+Same POSIX reality, two halves of the same coin.
+
+## The two framings
+
+[python-trio/trio#1614][trio-1614] (the canonical "trio +
+fork" hazards thread) puts it this way:
+
+> If you use `fork()` in a process with multiple threads,
+> all the other thread stacks are just leaked: there's
+> nothing else you can reasonably do with them.
+
+`tractor.spawn._main_thread_forkserver`'s module docstring
+(specifically the "What survives the fork? — POSIX
+semantics" section) puts it this way:
+
+> POSIX `fork()` only preserves the *calling* thread as a
+> runnable thread in the child. Every other thread in the
+> parent — trio's runner thread, any `to_thread` cache
+> threads, anything else — never executes another
+> instruction post-fork.
+
+A reader bouncing between the two can be forgiven for
+asking: well, *which* is it — leaked or gone?
+
+The answer is "yes". They're describing the same POSIX
+behavior from two different angles:
+
+- trio is talking about the **bytes** the dead threads
+  leave behind — stacks, TLS slots, per-thread arena
+  metadata — and the fact that nothing in the child can
+  drive them forward, free them, or even safely walk
+  them. That's a memory leak in the strict sense: held
+  but unreachable.
+- tractor is talking about the **execution** side
+  relevant to the forkserver design: which threads
+  retire instructions in the child? Exactly one — the
+  one that called `fork()`. Everything else, regardless
+  of the bytes left behind, is dead in a scheduler
+  sense.
+
+Neither framing is wrong; they're just answering
+different questions.
+
+## POSIX `fork()` in a multi-threaded program — what actually happens
+
+Per POSIX (and concretely on Linux glibc), the contract
+of `fork()` in a multi-threaded process is:
+
+1. The kernel creates a new process whose virtual
+   address space is a COW copy of the parent's. *All*
+   pages map across — code, heap, every thread's stack,
+   every malloc arena, every mmap region.
+2. Of the parent's N threads, exactly **one** is
+   reified in the child as a runnable kernel task: the
+   thread that called `fork()`. The other N-1 threads
+   have *no* corresponding task in the child kernel. They
+   were never scheduled, never `clone()`d for the child,
+   never exist as runnable entities.
+3. Their **memory artifacts** — pthread stacks, TLS,
+   `pthread_t` structures, glibc per-thread arena
+   bookkeeping — are still mapped in the child's address
+   space, because (1) duplicates *everything* page-wise.
+   They sit there as inert COW bytes.
+4. The kernel does not clean those bytes up. There is no
+   "phantom-thread cleanup" pass post-fork. The kernel
+   doesn't know which mapped pages "belonged to" which
+   thread — at the kernel level mappings are
+   process-scoped, not thread-scoped.
+5. The surviving thread (the caller of `fork()`) cannot
+   safely access those leaked bytes either. Any state
+   they encoded — held mutexes, in-flight syscalls,
+   half-updated invariants — is frozen at whatever
+   instant the parent's fork-syscall observed it. Some
+   of those mutexes may even still be locked from the
+   child's POV (the canonical "fork-in-multithreaded-
+   program-deadlocks" hazard; see `man pthread_atfork`).
+
+So: from the kernel's PoV, the child has one thread.
+From the address-space's PoV, the child has all the
+parent's bytes — including the corpses of the N-1 dead
+threads' stacks. Both true simultaneously.
+
+## Why trio says "leaked"
+
+trio's framing makes sense from the parent's
+PoV, looking at *what those threads were doing*. In a
+running `trio.run()` process you typically have:
+
+- The trio runner thread itself — owns the `selectors`
+  epoll fd, the signal-wakeup-fd, the run-queue.
+- Threadpool worker threads (`trio.to_thread`'s cache)
+  — blocked in `wait()` on the threadpool's work
+  condvar.
+- Whatever other ad-hoc threads the application
+  started.
+
+Each of those threads owns *real work-state*: epoll
+registrations, file descriptors held in
+soon-to-be-completed reads, half-released locks, posted
+but unconsumed wakeups. After fork, that state is still
+encoded in the child's memory. None of it is invalid in
+a well-formed-bytes sense. It's just that:
+
+- The thread that was driving it is gone.
+- Nothing else in the child knows the layout well
+  enough to take over.
+- Even if it did, the kernel objects backing the work
+  (epoll fd, signalfd) have separate post-fork
+  semantics that don't compose with userland trio
+  state.
+
+So the bytes are *held* (they're in the child's
+address space, they count against RSS, they survive
+until something clobbers them), and they're
+*unreachable* in any meaningful sense — no thread can
+safely drive them forward. That is the textbook
+definition of a leak.
+
+trio's quote is reminding the user that `fork()` from a
+multi-threaded process is a one-way memory hazard:
+whatever those threads were doing, that work-state is
+now garbage you happen to still be carrying.
+
+## Why tractor says "gone"
+
+tractor's `_main_thread_forkserver` framing is concerned
+with a different question: *which thread executes in the
+child, and is it safe?*
+
+The forkserver design rests on POSIX's "calling thread
+is the sole survivor" guarantee. We pick that calling
+thread very deliberately: a dedicated worker that has
+provably never entered trio. So the thread that *does*
+run in the child is one whose locals, TLS, and stack
+contain nothing trio-related. Trio's runner thread —
+the one that owned the epoll fd and the run-queue — is
+*gone* from the child in the execution sense. It will
+never run another instruction. The fact that its stack
+bytes still exist in the child's address space (the
+"leaked" view) is irrelevant to the forkserver, because
+nothing in the child reads or writes those pages.
+
+So when the docstring says "Every other thread … is
+gone the instant `fork()` returns in the child", it's
+being precise about the surface that matters for the
+backend: scheduler-level liveness. Nothing schedules
+those threads ever again. Whether their bytes are
+hanging around is a separate (and, for the design,
+non-load-bearing) fact.
+
+## Cross-table
+
+The same tabular layout the `_main_thread_forkserver`
+docstring uses, expanded with a fourth "what handles
+it" column:
+
+| thread              | parent    | child (executing) | child (memory)               | what handles it             |
+|---------------------|-----------|-------------------|------------------------------|-----------------------------|
+| forkserver worker   | continues | sole survivor     | live stack                   | runs the child's bootstrap  |
+| `trio.run()` thread | continues | not running       | leaked stack (zombie bytes)  | overwritten by child's fresh `trio.run()` |
+| any other thread    | continues | not running       | leaked stack (zombie bytes)  | overwritten / GC'd / clobbered by `exec()` if used |
+
+The "child (executing)" column is the *execution* side
+of the coin — what tractor cares about. The "child
+(memory)" column is the *memory* side — what trio
+cares about.
+
+The "what handles it" column is the deliberate punchline
+of the design: nothing has to handle the leaked bytes
+*explicitly*. They get clobbered by ordinary forward
+progress in the child:
+
+- The fresh `trio.run()` the child boots up allocates
+  its own stack, scheduler, and run-queue, which over
+  time overlaps and overwrites the inherited zombie
+  pages.
+- Python's GC walks live objects only; the dead-thread
+  Python frames aren't reachable from any
+  `PyThreadState`, so they get freed at the next
+  collection cycle.
+- If the child eventually `exec()`s, the entire address
+  space is replaced and the leak vanishes.
+
+## What this means for the forkserver design
+
+The crucial point is that **the design doesn't and
+*can't* prevent the leak**. There is no userland fix
+for COW thread stacks. The kernel hands the child a
+duplicated address space; that's what `fork()` *is*. No
+amount of pre-fork hookery, `pthread_atfork()`
+gymnastics, or post-fork cleanup can un-COW the dead
+threads' pages without unmapping them, and unmapping
+arbitrary regions of a duplicated address space is
+neither portable nor safe.
+
+What the design *does* ensure is the orthogonal
+property: the survivor thread is one that doesn't need
+any of that leaked state to function. Concretely:
+
+- Survivor is the forkserver worker thread.
+- That worker has provably never imported, called into,
+  or held any reference to `trio`. (Enforced by keeping
+  the worker's lifecycle entirely in
+  `_main_thread_forkserver.py` and never letting trio
+  task-state cross into it.)
+- So the leaked pages — trio runner stack, threadpool
+  caches, etc. — are inert relative to the survivor.
+  No code path in the child references them.
+- The child then boots its own fresh `trio.run()`,
+  which allocates new state in new pages. Over the
+  child's lifetime the COW'd zombie pages get
+  overwritten, GC'd, or (if the child eventually
+  `exec()`s) discarded wholesale.
+
+The "leak" is real but inert. It costs RSS until
+clobbered; it doesn't cost correctness. That's exactly
+the property the forkserver pattern is built on, and
+it's also why the design needs the "calling thread is
+trio-free" precondition to be airtight: if the survivor
+were a trio thread, it *would* try to drive the leaked
+trio state, and the leak would no longer be inert.
+
+## See also
+
+- `tractor/spawn/_main_thread_forkserver.py` — module
+  docstring's "What survives the fork? — POSIX
+  semantics" section is the in-tree, code-adjacent
+  prose this doc expands on. The cross-table here is a
+  fourth-column expansion of the table there.
+
+- [python-trio/trio#1614][trio-1614] — the trio issue
+  with the "leaked" framing, and the canonical thread
+  for trio + `fork()` hazards more broadly.
+
+- [`subint_fork_blocked_by_cpython_post_fork_issue.md`](./subint_fork_blocked_by_cpython_post_fork_issue.md)
+  — sibling analysis covering CPython's *post-fork*
+  hooks (`PyOS_AfterFork_Child`,
+  `_PyInterpreterState_DeleteExceptMain`) and why
+  fork-from-non-main-subint is a CPython-level hard
+  refusal. Complementary axis: this doc is about POSIX
+  semantics; that doc is about the CPython runtime
+  layer that runs *after* POSIX `fork()` returns in
+  the child.
+
+- `man pthread_atfork(3)` — canonical "fork in a
+  multithreaded process is dangerous" reference.
+  Especially the rationale section, which is the
+  closest thing to a normative statement of "the
+  surviving thread cannot safely use anything the dead
+  threads were touching."
+
+- `man fork(2)` (Linux) — "Other than [the calling
+  thread], … no other threads are replicated …"
+  paragraph is the kernel-side statement of the
+  execution-side framing this doc opens with.
+
+[trio-1614]: https://github.com/python-trio/trio/issues/1614

ai/conc-anal/spawn_time_boot_death_dup_name_issue.md

@@ -0,0 +1,142 @@
+# Spawn-time boot-death (`rc=2`) under rapid same-name spawn against a registrar
+
+## Symptom
+
+Spawning N (≥4) sub-actors with the **same name** in tight
+succession against a daemon registrar surfaces as
+`ActorFailure: Sub-actor (...) died during boot (rc=2)
+before completing parent-handshake`.
+
+```
+tests/discovery/test_multi_program.py
+  ::test_dup_name_cancel_cascade_escalates_to_hard_kill[n_dups=4]
+```
+
+```
+tractor._exceptions.ActorFailure:
+  Sub-actor ('doggy', '<uuid>') died during boot (rc=2)
+  before completing parent-handshake.
+    proc: <_ForkedProc pid=<n> returncode=None>
+```
+
+The `proc` repr shows `returncode=None` because the repr is
+captured before `proc.wait()` returns; the actual
+`os.WEXITSTATUS == 2` is reported via `result['died']` in the
+race-helper.
+
+## When it surfaces
+
+- N=2 (`n_dups=2`): **always passes**.
+- N=4 (`n_dups=4`): **consistent fail** under both `tpt-proto=tcp`
+  and `tpt-proto=uds`, MTF backend.
+- N=8 (`n_dups=8`): **passes** (counter-intuitive — see "racing
+  windows").
+- Non-MTF backends: not yet exercised systematically.
+
+## What previously masked it
+
+Pre the spawn-time `wait_for_peer_or_proc_death` race-helper
+(in `tractor.spawn._spawn`), the parent's `start_actor` flow
+ended with a bare:
+
+```python
+event, chan = await ipc_server.wait_for_peer(uid)
+```
+
+That awaits an unsignalled `trio.Event` on `_peer_connected[uid]`.
+If the sub-actor process **dies during boot** (before its
+runtime executes the parent-callback handshake that sets the
+event), the wait parks forever. The dead proc becomes a zombie
+because no one ever calls `proc.wait()` to reap it.
+
+In test contexts the failure presented as a hang or a much
+later `trio.TooSlowError` from an outer `fail_after`. In
+production it'd present as a parent that never makes progress
+past `start_actor`. The death itself was silently masked.
+
+## What surfaces it now
+
+`tractor.spawn._spawn.wait_for_peer_or_proc_death` (used by
+`_main_thread_forkserver_proc`) races the handshake-wait
+against `proc.wait()`. The race-helper raises `ActorFailure`
+on death-first instead of parking, exposing the rc=2.
+
+## Hypothesis: registrar-side same-name contention
+
+The test spawns N actors with name `doggy` sequentially:
+
+```python
+for i in range(n_dups):
+    p: Portal = await an.start_actor('doggy')
+    portals.append(p)
+```
+
+Each spawned doggy:
+
+1. Forks via the forkserver.
+2. Boots its runtime in `_actor_child_main`.
+3. Connects back to the parent for handshake.
+4. Connects to the daemon registrar to call `register_actor`.
+5. Enters its RPC msg-loop.
+
+Step (4) is where the same-name contention lives. The
+registrar's `register_actor` (in
+`tractor.discovery._registry`) accepts duplicate names
+(stores `(name, uuid) -> addr`), but its internal bookkeeping
+may have a non-trivial check (e.g. `wait_for_actor` resolution,
+`_addrs2aids` map updates) that errors out under specific
+ordering between the existing entry and the incoming one.
+
+`rc=2 == os.WEXITSTATUS == 2` corresponds to `sys.exit(2)`
+in the doggy process — typically reached via an unhandled
+exception that's translated to exit code 2 by Python's top-
+level (e.g. `argparse` errors use 2; `SystemExit(2)` etc.).
+So the doggy is hitting an explicit exit path during
+`register_actor` or just-after.
+
+The non-monotonic shape (N=2 OK, N=4 BAD, N=8 OK) suggests a
+specific timing window — likely "the 3rd register-RPC arrives
+while the 1st-or-2nd is in some intermediate state". With
+N=8, the additional procs widen the registration spread
+enough that no two land in the conflicting window.
+
+## Where to dig next
+
+- Add per-actor logging in `_actor_child_main` and
+  `register_actor` to surface the actual exception that
+  triggers the rc=2 exit. Currently the doggy dies before
+  the parent ever sees its stderr (forkserver doesn't
+  marshal child stdio back).
+- Race-test the registrar's `register_actor` /
+  `unregister_actor` /  `wait_for_actor` against same-name
+  concurrent calls in isolation (no spawn).
+- Consider whether `register_actor` should be idempotent
+  under same-name re-register or should explicitly reject
+  same-name (and ideally with a clear `RemoteActorError`,
+  not `sys.exit(2)`).
+
+## Test-suite handling
+
+Currently:
+
+- `tests/discovery/test_multi_program.py
+  ::test_dup_name_cancel_cascade_escalates_to_hard_kill[n_dups=4]`
+  is `pytest.mark.xfail(strict=False, reason=...)` to keep
+  the suite green while this issue is investigated.
+- `n_dups=2` and `n_dups=8` continue to validate the
+  cancel-cascade hard-kill escalation.
+
+Once the underlying race is understood + fixed, drop the
+xfail.
+
+## Related work
+
+- The cancel-cascade fix that introduced this regression
+  test:
+  `tractor/_exceptions.py:ActorTooSlowError`,
+  `tractor/runtime/_supervise.py:_try_cancel_then_kill`,
+  `tractor/runtime/_portal.py:Portal.cancel_actor(
+   raise_on_timeout=...)`.
+- The spawn-time death-detection that exposed this:
+  `tractor/spawn/_spawn.py:wait_for_peer_or_proc_death`,
+  used by `tractor/spawn/_main_thread_forkserver.py`.

ai/conc-anal/subint_cancel_delivery_hang_issue.md

@@ -0,0 +1,161 @@
+# `subint` backend: parent trio loop parks after subint teardown (Ctrl-C works; not a CPython-level issue)
+
+Follow-up to the Phase B subint spawn-backend PR (see
+`tractor.spawn._subint`, issue #379). Distinct from the
+`subint_sigint_starvation_issue.md` (SIGINT-unresponsive
+starvation hang): this one is **Ctrl-C-able**, which means
+it's *not* the shared-GIL-hostage class and is ours to fix
+from inside tractor rather than waiting on upstream CPython
+/ msgspec progress.
+
+## TL;DR
+
+After a stuck-subint subactor is torn down via the
+hard-kill path, a parent-side trio task parks on an
+*orphaned resource* (most likely a `chan.recv()` /
+`process_messages` loop on the now-dead subint's IPC
+channel) and waits forever for bytes that can't arrive —
+because the channel was torn down without emitting a clean
+EOF/`BrokenResourceError` to the waiting receiver.
+
+Unlike `subint_sigint_starvation_issue.md`, the main trio
+loop **is** iterating normally — SIGINT delivers cleanly
+and the test unhangs. But absent Ctrl-C, the test suite
+wedges indefinitely.
+
+## Symptom
+
+Running `test_subint_non_checkpointing_child` under
+`--spawn-backend=subint` (in
+`tests/test_subint_cancellation.py`):
+
+1. Test spawns a subactor whose main task runs
+   `threading.Event.wait(1.0)` in a loop — releases the
+   GIL but never inserts a trio checkpoint.
+2. Parent does `an.cancel_scope.cancel()`. Our
+   `subint_proc` cancel path fires: soft-kill sends
+   `Portal.cancel_actor()` over the live IPC channel →
+   subint's trio loop *should* process the cancel msg on
+   its IPC dispatcher task (since the GIL releases are
+   happening).
+3. Expected: subint's `trio.run()` unwinds, driver thread
+   exits naturally, parent returns.
+4. Actual: parent `trio.run()` never completes. Test
+   hangs past its `trio.fail_after()` deadline.
+
+## Evidence
+
+### `strace` on the hung pytest process during SIGINT
+
+```
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(17, "\2", 1)                      = 1
+```
+
+Contrast with the SIGINT-starvation hang (see
+`subint_sigint_starvation_issue.md`) where that same
+`write()` returned `EAGAIN`. Here the SIGINT byte is
+written successfully → Python's signal handler pipe is
+being drained → main trio loop **is** iterating → SIGINT
+gets turned into `trio.Cancelled` → the test unhangs (if
+the operator happens to be there to hit Ctrl-C).
+
+### Stack dump (via `tractor.devx.dump_on_hang`)
+
+Single main thread visible, parked in
+`trio._core._io_epoll.get_events` inside `trio.run` at the
+test's `trio.run(...)` call site. No subint driver thread
+(subint was destroyed successfully — this is *after* the
+hard-kill path, not during it).
+
+## Root cause hypothesis
+
+Most consistent with the evidence: a parent-side trio
+task is awaiting a `chan.recv()` / `process_messages` loop
+on the dead subint's IPC channel. The sequence:
+
+1. Soft-kill in `subint_proc` sends `Portal.cancel_actor()`
+   over the channel. The subint's trio dispatcher *may* or
+   may not have processed the cancel msg before the subint
+   was destroyed — timing-dependent.
+2. Hard-kill timeout fires (because the subint's main
+   task was in `threading.Event.wait()` with no trio
+   checkpoint — cancel-msg processing couldn't race the
+   timeout).
+3. Driver thread abandoned, `_interpreters.destroy()`
+   runs. Subint is gone.
+4. But the parent-side trio task holding a
+   `chan.recv()` / `process_messages` loop against that
+   channel was **not** explicitly cancelled. The channel's
+   underlying socket got torn down, but without a clean
+   EOF delivered to the waiting recv, the task parks
+   forever on `trio.lowlevel.wait_readable` (or similar).
+
+This matches the "main loop fine, task parked on
+orphaned I/O" signature.
+
+## Why this is ours to fix (not CPython's)
+
+- Main trio loop iterates normally → GIL isn't starved.
+- SIGINT is deliverable → not a signal-pipe-full /
+  wakeup-fd contention scenario.
+- The hang is in *our* supervision code, specifically in
+  how `subint_proc` tears down its side of the IPC when
+  the subint is abandoned/destroyed.
+
+## Possible fix directions
+
+1. **Explicit parent-side channel abort on subint
+   abandon.** In `subint_proc`'s teardown block, after the
+   hard-kill timeout fires, explicitly close the parent's
+   end of the IPC channel to the subint. Any waiting
+   `chan.recv()` / `process_messages` task sees
+   `BrokenResourceError` (or `ClosedResourceError`) and
+   unwinds.
+2. **Cancel parent-side RPC tasks tied to the dead
+   subint's channel.** The `Actor._rpc_tasks` / nursery
+   machinery should have a handle on any
+   `process_messages` loops bound to a specific peer
+   channel. Iterate those and cancel explicitly.
+3. **Bound the top-level `await actor_nursery
+   ._join_procs.wait()` shield in `subint_proc`** (same
+   pattern as the other bounded shields the hard-kill
+   patch added). If the nursery never sets `_join_procs`
+   because a child task is parked, the bound would at
+   least let the teardown proceed.
+
+Of these, (1) is the most surgical and directly addresses
+the root cause. (2) is a defense-in-depth companion. (3)
+is a band-aid but cheap to add.
+
+## Current workaround
+
+None in-tree. The test's `trio.fail_after()` bound
+currently fires and raises `TooSlowError`, so the test
+visibly **fails** rather than hangs — which is
+intentional (an unbounded cancellation-audit test would
+defeat itself). But in interactive test runs the operator
+has to hit Ctrl-C to move past the parked state before
+pytest reports the failure.
+
+## Reproducer
+
+```
+./py314/bin/python -m pytest \
+  tests/test_subint_cancellation.py::test_subint_non_checkpointing_child \
+  --spawn-backend=subint --tb=short --no-header -v
+```
+
+Expected: hangs until `trio.fail_after(15)` fires, or
+Ctrl-C unwedges it manually.
+
+## References
+
+- `tractor.spawn._subint.subint_proc` — current subint
+  teardown code; see the `_HARD_KILL_TIMEOUT` bounded
+  shields + `daemon=True` driver-thread abandonment
+  (commit `b025c982`).
+- `ai/conc-anal/subint_sigint_starvation_issue.md` — the
+  sibling CPython-level hang (GIL-starvation,
+  SIGINT-unresponsive) which is **not** this issue.
+- Phase B tracking: issue #379.

ai/conc-anal/subint_fork_blocked_by_cpython_post_fork_issue.md

@@ -0,0 +1,337 @@
+# `os.fork()` from a non-main sub-interpreter aborts the child (CPython refuses post-fork cleanup)
+
+Third `subint`-class analysis in this project. Unlike its
+two siblings (`subint_sigint_starvation_issue.md`,
+`subint_cancel_delivery_hang_issue.md`), this one is not a
+hang — it's a **hard CPython-level refusal** of an
+experimental spawn strategy we wanted to try.
+
+## TL;DR
+
+An in-process sub-interpreter cannot be used as a
+"launchpad" for `os.fork()` on current CPython. The fork
+syscall succeeds in the parent, but the forked CHILD
+process is aborted immediately by CPython's post-fork
+cleanup with:
+
+```
+Fatal Python error: _PyInterpreterState_DeleteExceptMain: not main interpreter
+```
+
+This is enforced by a hard `PyStatus_ERR` gate in
+`Python/pystate.c`. The CPython devs acknowledge the
+fragility with an in-source comment (`// Ideally we could
+guarantee tstate is running main.`) but provide no
+mechanism to satisfy the precondition from user code.
+
+**Implication for tractor**: the `subint_fork` backend
+sketched in `tractor.spawn._subint_fork` is structurally
+dead on current CPython. The submodule is kept as
+documentation of the attempt; `--spawn-backend=subint_fork`
+raises `NotImplementedError` pointing here.
+
+## Context — why we tried this
+
+The motivation is issue #379's "Our own thoughts, ideas
+for `fork()`-workaround/hacks..." section. The existing
+trio-backend (`tractor.spawn._trio.trio_proc`) spawns
+subactors via `trio.lowlevel.open_process()` → ultimately
+`posix_spawn()` or `fork+exec`, from the parent's main
+interpreter that is currently running `trio.run()`. This
+brushes against a known-fragile interaction between
+`trio` and `fork()` tracked in
+[python-trio/trio#1614](https://github.com/python-trio/trio/issues/1614)
+and siblings — mostly mitigated in `tractor`'s case only
+incidentally (we `exec()` immediately post-fork).
+
+The idea was:
+
+1. Create a subint that has *never* imported `trio`.
+2. From a worker thread in that subint, call `os.fork()`.
+3. In the child, `execv()` back into
+   `python -m tractor._child` — same as `trio_proc` does.
+4. The fork is from a trio-free context → trio+fork
+   hazards avoided regardless of downstream behavior.
+
+The parent-side orchestration (`ipc_server.wait_for_peer`,
+`SpawnSpec`, `Portal` yield) would reuse
+`trio_proc`'s flow verbatim, with only the subproc-spawn
+mechanics swapped.
+
+## Symptom
+
+Running the prototype (`tractor.spawn._subint_fork.subint_fork_proc`,
+see git history prior to the stub revert) on py3.14:
+
+```
+Fatal Python error: _PyInterpreterState_DeleteExceptMain: not main interpreter
+Python runtime state: initialized
+
+Current thread 0x00007f6b71a456c0 [subint-fork-lau] (most recent call first):
+  File "<script>", line 2 in <module>
+<script>:2: DeprecationWarning: This process (pid=802985) is multi-threaded, use of fork() may lead to deadlocks in the child.
+```
+
+Key clues:
+
+- The **`DeprecationWarning`** fires in the parent (before
+  fork completes) — fork *is* executing, we get that far.
+- The **`Fatal Python error`** comes from the child — it
+  aborts during CPython's post-fork C initialization
+  before any user Python runs in the child.
+- The thread name `subint-fork-lau[nchpad]` is ours —
+  confirms the fork is being called from the launchpad
+  subint's driver thread.
+
+## CPython source walkthrough
+
+### Call site — `Modules/posixmodule.c:728-793`
+
+The post-fork-child hook CPython runs in the child process:
+
+```c
+void
+PyOS_AfterFork_Child(void)
+{
+    PyStatus status;
+    _PyRuntimeState *runtime = &_PyRuntime;
+
+    // re-creates runtime->interpreters.mutex (HEAD_UNLOCK)
+    status = _PyRuntimeState_ReInitThreads(runtime);
+    ...
+
+    PyThreadState *tstate = _PyThreadState_GET();
+    _Py_EnsureTstateNotNULL(tstate);
+
+    ...
+
+    // Ideally we could guarantee tstate is running main.   ← !!!
+    _PyInterpreterState_ReinitRunningMain(tstate);
+
+    status = _PyEval_ReInitThreads(tstate);
+    ...
+
+    status = _PyInterpreterState_DeleteExceptMain(runtime);
+    if (_PyStatus_EXCEPTION(status)) {
+        goto fatal_error;
+    }
+    ...
+
+fatal_error:
+    Py_ExitStatusException(status);
+}
+```
+
+The `// Ideally we could guarantee tstate is running
+main.` comment is a flashing warning sign — the CPython
+devs *know* this path is fragile when fork is called from
+a non-main subint, but they've chosen to abort rather than
+silently corrupt state. Arguably the right call.
+
+### The refusal — `Python/pystate.c:1035-1075`
+
+```c
+/*
+ * Delete all interpreter states except the main interpreter.  If there
+ * is a current interpreter state, it *must* be the main interpreter.
+ */
+PyStatus
+_PyInterpreterState_DeleteExceptMain(_PyRuntimeState *runtime)
+{
+    struct pyinterpreters *interpreters = &runtime->interpreters;
+
+    PyThreadState *tstate = _PyThreadState_Swap(runtime, NULL);
+    if (tstate != NULL && tstate->interp != interpreters->main) {
+        return _PyStatus_ERR("not main interpreter");       ← our error
+    }
+
+    HEAD_LOCK(runtime);
+    PyInterpreterState *interp = interpreters->head;
+    interpreters->head = NULL;
+    while (interp != NULL) {
+        if (interp == interpreters->main) {
+            interpreters->main->next = NULL;
+            interpreters->head = interp;
+            interp = interp->next;
+            continue;
+        }
+
+        // XXX Won't this fail since PyInterpreterState_Clear() requires
+        // the "current" tstate to be set?
+        PyInterpreterState_Clear(interp);  // XXX must activate?
+        zapthreads(interp);
+        ...
+    }
+    ...
+}
+```
+
+The comment in the docstring (`If there is a current
+interpreter state, it *must* be the main interpreter.`) is
+the formal API contract. The `XXX` comments further in
+suggest the CPython team is already aware this function
+has latent issues even in the happy path.
+
+## Chain summary
+
+1. Our launchpad subint's driver OS-thread calls
+   `os.fork()`.
+2. `fork()` succeeds. Child wakes up with:
+   - The parent's full memory image (including all
+     subints).
+   - Only the *calling* thread alive (the driver thread).
+   - `_PyThreadState_GET()` on that thread returns the
+     **launchpad subint's tstate**, *not* main's.
+3. CPython runs `PyOS_AfterFork_Child()`.
+4. It reaches `_PyInterpreterState_DeleteExceptMain()`.
+5. Gate check fails: `tstate->interp != interpreters->main`.
+6. `PyStatus_ERR("not main interpreter")` → `fatal_error`
+   goto → `Py_ExitStatusException()` → child aborts.
+
+Parent-side consequence: `os.fork()` in the subint
+bootstrap returned successfully with the child's PID, but
+the child died before connecting back. Our parent's
+`ipc_server.wait_for_peer(uid)` would hang forever — the
+child never gets to `_actor_child_main`.
+
+## Definitive answer to "Open Question 1"
+
+From the (now-stub) `subint_fork_proc` docstring:
+
+> Does CPython allow `os.fork()` from a non-main
+> sub-interpreter under the legacy config?
+
+**No.** Not in a usable-by-user-code sense. The fork
+syscall is not blocked, but the child cannot survive
+CPython's post-fork initialization. This is enforced, not
+accidental, and the CPython devs have acknowledged the
+fragility in-source.
+
+## What we'd need from CPython to unblock
+
+Any one of these, from least-to-most invasive:
+
+1. **A pre-fork hook mechanism** that lets user code (or
+   tractor itself via `os.register_at_fork(before=...)`)
+   swap the current tstate to main before fork runs. The
+   swap would need to work across the subint→main
+   boundary, which is the actual hard part —
+   `_PyThreadState_Swap()` exists but is internal.
+
+2. **A `_PyInterpreterState_DeleteExceptFor(tstate->interp)`
+   variant** that cleans up all *other* subints while
+   preserving the calling subint's state. Lets the child
+   continue executing in the subint after fork; a
+   subsequent `execv()` clears everything at the OS
+   level anyway.
+
+3. **A cleaner error** than `Fatal Python error` aborting
+   the child. Even without fixing the underlying
+   capability, a raised Python-level exception in the
+   parent's `fork()` call (rather than a silent child
+   abort) would at least make the failure mode
+   debuggable.
+
+## Upstream-report draft (for CPython issue tracker)
+
+### Title
+
+> `os.fork()` from a non-main sub-interpreter aborts the
+> child with a fatal error in `PyOS_AfterFork_Child`; can
+> we at least make it a clean `RuntimeError` in the
+> parent?
+
+### Body
+
+> **Version**: Python 3.14.x
+>
+> **Summary**: Calling `os.fork()` from a thread currently
+> executing inside a sub-interpreter causes the forked
+> child process to abort during CPython's post-fork
+> cleanup, with the following output in the child:
+>
+> ```
+> Fatal Python error: _PyInterpreterState_DeleteExceptMain: not main interpreter
+> ```
+>
+> From the **parent's** point of view the fork succeeded
+> (returned a valid child PID). The failure is completely
+> opaque to parent-side Python code — unless the parent
+> does `os.waitpid()` it won't even notice the child
+> died.
+>
+> **Root cause** (as I understand it from reading sources):
+> `Modules/posixmodule.c::PyOS_AfterFork_Child()` calls
+> `_PyInterpreterState_DeleteExceptMain()` with a
+> precondition that `_PyThreadState_GET()->interp` be the
+> main interpreter. When `fork()` is called from a thread
+> executing inside a subinterpreter, the child wakes up
+> with its tstate still pointing at the subint, and the
+> gate in `Python/pystate.c:1044-1047` fails.
+>
+> A comment in the source
+> (`Modules/posixmodule.c:753` — `// Ideally we could
+> guarantee tstate is running main.`) suggests this is a
+> known-fragile path rather than an intentional
+> invariant.
+>
+> **Use case**: I was experimenting with using a
+> sub-interpreter as a "fork launchpad" — have a subint
+> that has never imported `trio`, call `os.fork()` from
+> that subint's thread, and in the child `execv()` back
+> into a fresh Python interpreter process. The goal was
+> to sidestep known issues with `trio` + `fork()`
+> interaction (see
+> [python-trio/trio#1614](https://github.com/python-trio/trio/issues/1614))
+> by guaranteeing the forking context had never been
+> "contaminated" by trio's imports or globals. This
+> approach would allow `trio`-using applications to
+> combine `fork`-based subprocess spawning with
+> per-worker `trio.run()` runtimes — a fairly common
+> pattern that currently requires workarounds.
+>
+> **Request**:
+>
+> Ideally: make fork-from-subint work (e.g., by swapping
+> the caller's tstate to main in the pre-fork hook), or
+> provide a `_PyInterpreterState_DeleteExceptFor(interp)`
+> variant that permits the caller's subint to survive
+> post-fork so user code can subsequently `execv()`.
+>
+> Minimally: convert the fatal child-side abort into a
+> clean `RuntimeError` (or similar) raised in the
+> parent's `fork()` call. Even if the capability isn't
+> expanded, the failure mode should be debuggable by
+> user-code in the parent — right now it's a silent
+> child death with an error message buried in the
+> child's stderr that parent code can't programmatically
+> see.
+>
+> **Related**: PEP 684 (per-interpreter GIL), PEP 734
+> (`concurrent.interpreters` public API). The private
+> `_interpreters` module is what I used to create the
+> launchpad — behavior is the same whether using
+> `_interpreters.create('legacy')` or
+> `concurrent.interpreters.create()` (the latter was not
+> tested but the gate is identical).
+>
+> Happy to contribute a minimal reproducer + test case if
+> this is something the team wants to pursue.
+
+## References
+
+- `Modules/posixmodule.c:728` —
+  [`PyOS_AfterFork_Child`](https://github.com/python/cpython/blob/main/Modules/posixmodule.c#L728)
+- `Python/pystate.c:1040` —
+  [`_PyInterpreterState_DeleteExceptMain`](https://github.com/python/cpython/blob/main/Python/pystate.c#L1040)
+- PEP 684 (per-interpreter GIL):
+  <https://peps.python.org/pep-0684/>
+- PEP 734 (`concurrent.interpreters` public API):
+  <https://peps.python.org/pep-0734/>
+- [python-trio/trio#1614](https://github.com/python-trio/trio/issues/1614)
+  — the original motivation for the launchpad idea.
+- tractor issue #379 — "Our own thoughts, ideas for
+  `fork()`-workaround/hacks..." section where this was
+  first sketched.
+- `tractor.spawn._subint_fork` — in-tree stub preserving
+  the attempted impl's shape in git history.

ai/conc-anal/subint_fork_from_main_thread_smoketest.py

@@ -0,0 +1,375 @@
+#!/usr/bin/env python3
+'''
+Standalone CPython-level feasibility check for the "main-interp
+worker-thread forkserver + subint-hosted trio" architecture
+proposed as a workaround to the CPython-level refusal
+documented in
+`ai/conc-anal/subint_fork_blocked_by_cpython_post_fork_issue.md`.
+
+Purpose
+-------
+Deliberately NOT a `tractor` test. Zero `tractor` imports.
+Uses `_interpreters` (private stdlib) + `os.fork()` directly so
+the signal is unambiguous — pass/fail here is a property of
+CPython alone, independent of our runtime.
+
+Run each scenario in isolation; the child's fate is observable
+only via `os.waitpid()` of the parent and the scenario's own
+status prints.
+
+Scenarios (pick one with `--scenario <name>`)
+---------------------------------------------
+
+- `control_subint_thread_fork` — the KNOWN-BROKEN case we
+  documented in `subint_fork_blocked_by_cpython_post_fork_issue.md`:
+  drive a subint from a thread, call `os.fork()` inside its
+  `_interpreters.exec()`, watch the child abort. **Included as
+  a control** — if this scenario DOESN'T abort the child, our
+  analysis is wrong and we should re-check everything.
+
+- `main_thread_fork` — baseline sanity. Call `os.fork()` from
+  the process's main thread. Must always succeed; if this
+  fails something much bigger is broken.
+
+- `worker_thread_fork` — the architectural assertion. Spawn a
+  regular `threading.Thread` (attached to main interp, NOT a
+  subint), have IT call `os.fork()`. Child should survive
+  post-fork cleanup.
+
+- `full_architecture` — end-to-end: main-interp worker thread
+  forks. In the child, fork-thread (still main-interp) creates
+  a subint, drives a second worker thread inside it that runs
+  a trivial `trio.run()`. Validates the "root runtime lives in
+  a subint in the child" piece of the proposed arch.
+
+All scenarios print a self-contained pass/fail banner. Exit
+code 0 on expected outcome (which for `control_*` means "child
+aborted", not "child succeeded"!).
+
+Requires Python 3.14+.
+
+Usage
+-----
+::
+
+    python subint_fork_from_main_thread_smoketest.py \\
+        --scenario main_thread_fork
+
+    python subint_fork_from_main_thread_smoketest.py \\
+        --scenario full_architecture
+
+'''
+from __future__ import annotations
+import argparse
+import os
+import sys
+import threading
+import time
+
+
+# Hard-require py3.14 for the public `concurrent.interpreters`
+# API (we still drop to `_interpreters` internally, same as
+# `tractor.spawn._subint`).
+try:
+    from concurrent import interpreters as _public_interpreters  # noqa: F401
+    import _interpreters  # type: ignore
+except ImportError:
+    print(
+        'FAIL (setup): requires Python 3.14+ '
+        '(missing `concurrent.interpreters`)',
+        file=sys.stderr,
+    )
+    sys.exit(2)
+
+
+# The actual primitives this script exercises live in
+# `tractor.spawn._subint_forkserver` — we re-import them here
+# rather than inlining so the module and the validation stay
+# in sync. (Early versions of this file had them inline for
+# the "zero tractor imports" isolation guarantee; now that
+# CPython-level feasibility is confirmed, the validated
+# primitives have moved into tractor proper.)
+from tractor.spawn._main_thread_forkserver import (
+    fork_from_worker_thread,
+    wait_child,
+)
+from tractor.spawn._subint_forkserver import (
+    run_subint_in_worker_thread,
+)
+
+
+# ----------------------------------------------------------------
+# small observability helpers (test-harness only)
+# ----------------------------------------------------------------
+
+
+def _banner(title: str) -> None:
+    line = '=' * 60
+    print(f'\n{line}\n{title}\n{line}', flush=True)
+
+
+def _report(
+    label: str,
+    *,
+    ok: bool,
+    status_str: str,
+    expect_exit_ok: bool,
+) -> None:
+    verdict: str = 'PASS' if ok else 'FAIL'
+    expected_str: str = (
+        'normal exit (rc=0)'
+        if expect_exit_ok
+        else 'abnormal death (signal or nonzero exit)'
+    )
+    print(
+        f'[{verdict}] {label}: '
+        f'expected {expected_str}; observed {status_str}',
+        flush=True,
+    )
+
+
+# ----------------------------------------------------------------
+# scenario: `control_subint_thread_fork` (known-broken)
+# ----------------------------------------------------------------
+
+
+def scenario_control_subint_thread_fork() -> int:
+    _banner(
+        '[control] fork from INSIDE a subint (expected: child aborts)'
+    )
+    interp_id = _interpreters.create('legacy')
+    print(f'  created subint {interp_id}', flush=True)
+
+    # Shared flag: child writes a sentinel file we can detect from
+    # the parent. If the child manages to write this, CPython's
+    # post-fork refusal is NOT happening → analysis is wrong.
+    sentinel = '/tmp/subint_fork_smoketest_control_child_ran'
+    try:
+        os.unlink(sentinel)
+    except FileNotFoundError:
+        pass
+
+    bootstrap = (
+        'import os\n'
+        'pid = os.fork()\n'
+        'if pid == 0:\n'
+        # child — if CPython's refusal fires this code never runs
+        f'    with open({sentinel!r}, "w") as f:\n'
+        '        f.write("ran")\n'
+        '    os._exit(0)\n'
+        'else:\n'
+        # parent side (inside the launchpad subint) — stash the
+        # forked PID on a shareable dict so we can waitpid()
+        # from the outer main interp. We can't just return it;
+        # _interpreters.exec() returns nothing useful.
+        '    import builtins\n'
+        '    builtins._forked_child_pid = pid\n'
+    )
+
+    # NOTE, we can't easily pull state back from the subint.
+    # For the CONTROL scenario we just time-bound the fork +
+    # check the sentinel. If sentinel exists → child ran →
+    # analysis wrong. If not → child aborted → analysis
+    # confirmed.
+    done = threading.Event()
+
+    def _drive() -> None:
+        try:
+            _interpreters.exec(interp_id, bootstrap)
+        except Exception as err:
+            print(
+                f'  subint bootstrap raised (expected on some '
+                f'CPython versions): {type(err).__name__}: {err}',
+                flush=True,
+            )
+        finally:
+            done.set()
+
+    t = threading.Thread(
+        target=_drive,
+        name='control-subint-fork-launchpad',
+        daemon=True,
+    )
+    t.start()
+    done.wait(timeout=5.0)
+    t.join(timeout=2.0)
+
+    # Give the (possibly-aborted) child a moment to die.
+    time.sleep(0.5)
+
+    sentinel_present = os.path.exists(sentinel)
+    verdict = (
+        # "PASS" for our analysis means sentinel NOT present.
+        'PASS' if not sentinel_present else 'FAIL (UNEXPECTED)'
+    )
+    print(
+        f'[{verdict}] control: sentinel present={sentinel_present} '
+        f'(analysis predicts False — child should abort before '
+        f'writing)',
+        flush=True,
+    )
+    if sentinel_present:
+        os.unlink(sentinel)
+
+    try:
+        _interpreters.destroy(interp_id)
+    except _interpreters.InterpreterError:
+        pass
+
+    return 0 if not sentinel_present else 1
+
+
+# ----------------------------------------------------------------
+# scenario: `main_thread_fork` (baseline sanity)
+# ----------------------------------------------------------------
+
+
+def scenario_main_thread_fork() -> int:
+    _banner(
+        '[baseline] fork from MAIN thread (expected: child exits normally)'
+    )
+
+    pid = os.fork()
+    if pid == 0:
+        os._exit(0)
+
+    return 0 if _wait_child(
+        pid,
+        label='main_thread_fork',
+        expect_exit_ok=True,
+    ) else 1
+
+
+# ----------------------------------------------------------------
+# scenario: `worker_thread_fork` (architectural assertion)
+# ----------------------------------------------------------------
+
+
+def _run_worker_thread_fork_scenario(
+    label: str,
+    *,
+    child_target=None,
+) -> int:
+    '''
+    Thin wrapper: delegate the actual fork to the
+    `tractor.spawn._subint_forkserver` primitive, then wait
+    on the child and render a pass/fail banner.
+
+    '''
+    try:
+        pid: int = fork_from_worker_thread(
+            child_target=child_target,
+            thread_name=f'worker-fork-thread[{label}]',
+        )
+    except RuntimeError as err:
+        print(f'[FAIL] {label}: {err}', flush=True)
+        return 1
+    print(f'  forked child pid={pid}', flush=True)
+    ok, status_str = wait_child(pid, expect_exit_ok=True)
+    _report(
+        label,
+        ok=ok,
+        status_str=status_str,
+        expect_exit_ok=True,
+    )
+    return 0 if ok else 1
+
+
+def scenario_worker_thread_fork() -> int:
+    _banner(
+        '[arch] fork from MAIN-INTERP WORKER thread '
+        '(expected: child exits normally — this is the one '
+        'that matters)'
+    )
+    return _run_worker_thread_fork_scenario(
+        'worker_thread_fork',
+    )
+
+
+# ----------------------------------------------------------------
+# scenario: `full_architecture`
+# ----------------------------------------------------------------
+
+
+_CHILD_TRIO_BOOTSTRAP: str = (
+    'import trio\n'
+    'async def _main():\n'
+    '    await trio.sleep(0.05)\n'
+    '    return 42\n'
+    'result = trio.run(_main)\n'
+    'assert result == 42, f"trio.run returned {result}"\n'
+    'print("  CHILD subint: trio.run OK, result=42", '
+    'flush=True)\n'
+)
+
+
+def _child_trio_in_subint() -> int:
+    '''
+    CHILD-side `child_target`: drive a trivial `trio.run()`
+    inside a fresh legacy-config subint on a worker thread,
+    using the `tractor.spawn._subint_forkserver.run_subint_in_worker_thread`
+    primitive. Returns 0 on success.
+
+    '''
+    try:
+        run_subint_in_worker_thread(
+            _CHILD_TRIO_BOOTSTRAP,
+            thread_name='child-subint-trio-thread',
+        )
+    except RuntimeError as err:
+        print(
+            f'  CHILD: run_subint_in_worker_thread timed out / thread '
+            f'never returned: {err}',
+            flush=True,
+        )
+        return 3
+    except BaseException as err:
+        print(
+            f'  CHILD: subint bootstrap raised: '
+            f'{type(err).__name__}: {err}',
+            flush=True,
+        )
+        return 4
+    return 0
+
+
+def scenario_full_architecture() -> int:
+    _banner(
+        '[arch-full] worker-thread fork + child runs trio in a '
+        'subint (end-to-end proposed arch)'
+    )
+    return _run_worker_thread_fork_scenario(
+        'full_architecture',
+        child_target=_child_trio_in_subint,
+    )
+
+
+# ----------------------------------------------------------------
+# main
+# ----------------------------------------------------------------
+
+
+SCENARIOS: dict[str, Callable[[], int]] = {
+    'control_subint_thread_fork': scenario_control_subint_thread_fork,
+    'main_thread_fork': scenario_main_thread_fork,
+    'worker_thread_fork': scenario_worker_thread_fork,
+    'full_architecture': scenario_full_architecture,
+}
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+    ap.add_argument(
+        '--scenario',
+        choices=sorted(SCENARIOS.keys()),
+        required=True,
+    )
+    args = ap.parse_args()
+    return SCENARIOS[args.scenario]()
+
+
+if __name__ == '__main__':
+    sys.exit(main())

ai/conc-anal/subint_forkserver_orphan_sigint_hang_issue.md

@@ -0,0 +1,385 @@
+# `subint_forkserver` backend: orphaned-subactor SIGINT wedged in `epoll_wait`
+
+Follow-up to the Phase C `subint_forkserver` spawn-backend
+PR (see `tractor.spawn._subint_forkserver`, issue #379).
+Surfaced by the xfail'd
+`tests/spawn/test_subint_forkserver.py::test_orphaned_subactor_sigint_cleanup_DRAFT`.
+
+Related-but-distinct from
+`subint_cancel_delivery_hang_issue.md` (orphaned-channel
+park AFTER subint teardown) and
+`subint_sigint_starvation_issue.md` (GIL-starvation,
+SIGINT never delivered): here the SIGINT IS delivered,
+trio's handler IS installed, but trio's event loop never
+wakes — so the KBI-at-checkpoint → `_trio_main` catch path
+(which is the runtime's *intentional* OS-cancel design)
+never fires.
+
+## TL;DR
+
+When a `subint_forkserver`-spawned subactor is orphaned
+(parent `SIGKILL`'d, no IPC cancel path available) and then
+externally `SIGINT`'d, the subactor hangs in
+`trio/_core/_io_epoll.py::get_events` (epoll_wait)
+indefinitely — even though:
+
+1. `threading.current_thread() is threading.main_thread()`
+   post-fork (CPython 3.14 re-designates correctly).
+2. Trio's SIGINT handler IS installed in the subactor
+   (`signal.getsignal(SIGINT)` returns
+   `<function KIManager.install.<locals>.handler at 0x...>`).
+3. The kernel does deliver SIGINT — the signal arrives at
+   the only thread in the process (the fork-inherited
+   worker which IS now "main" per Python).
+
+Yet `epoll_wait` does not return. Trio's wakeup-fd mechanism
+— the machinery that turns SIGINT into an epoll-wake — is
+somehow not firing the wakeup. Until that's fixed, the
+intentional "KBI-as-OS-cancel" path in
+`tractor/spawn/_entry.py::_trio_main:164` is unreachable
+for forkserver-spawned subactors whose parent dies.
+
+## Symptom
+
+Test: `tests/spawn/test_subint_forkserver.py::test_orphaned_subactor_sigint_cleanup_DRAFT`
+(currently marked `@pytest.mark.xfail(strict=True)`).
+
+1. Harness subprocess brings up a tractor root actor +
+   one `run_in_actor(_sleep_forever)` subactor via
+   `try_set_start_method('subint_forkserver')`.
+2. Harness prints `CHILD_PID` (subactor) and
+   `PARENT_READY` (root actor) markers to stdout.
+3. Test `os.kill(parent_pid, SIGKILL)` + `proc.wait()`
+   to fully reap the root-actor harness.
+4. Child (now reparented to pid 1) is still alive.
+5. Test `os.kill(child_pid, SIGINT)` and polls
+   `os.kill(child_pid, 0)` for up to 10s.
+6. **Observed**: the child is still alive at deadline —
+   SIGINT did not unwedge the trio loop.
+
+## What the "intentional" cancel path IS
+
+`tractor/spawn/_entry.py::_trio_main:157-186` —
+
+```python
+try:
+    if infect_asyncio:
+        actor._infected_aio = True
+        run_as_asyncio_guest(trio_main)
+    else:
+        trio.run(trio_main)
+
+except KeyboardInterrupt:
+    logmeth = log.cancel
+    exit_status: str = (
+        'Actor received KBI (aka an OS-cancel)\n'
+        ...
+    )
+```
+
+The "KBI == OS-cancel" mapping IS the runtime's
+deliberate, documented design. An OS-level SIGINT should
+flow as: kernel → trio handler → KBI at trio checkpoint
+→ unwinds `async_main` → surfaces at `_trio_main`'s
+`except KeyboardInterrupt:` → `log.cancel` + clean `rc=0`.
+
+**So fixing this hang is not "add a new SIGINT behavior" —
+it's "make the existing designed behavior actually fire in
+this backend config".** That's why option (B) ("fix root
+cause") is aligned with existing design intent, not a
+scope expansion.
+
+## Evidence
+
+### Positive control: standalone fork-from-worker + `trio.run(sleep_forever)` + SIGINT WORKS
+
+```python
+import os, signal, time, trio
+from tractor.spawn._subint_forkserver import (
+    fork_from_worker_thread, wait_child,
+)
+
+def child_target() -> int:
+    async def _main():
+        try:
+            await trio.sleep_forever()
+        except KeyboardInterrupt:
+            print('CHILD: caught KBI — trio SIGINT works!')
+            return
+    trio.run(_main)
+    return 0
+
+pid = fork_from_worker_thread(child_target, thread_name='trio-sigint-test')
+time.sleep(1.0)
+os.kill(pid, signal.SIGINT)
+wait_child(pid)
+```
+
+Result: `CHILD: caught KBI — trio SIGINT works!` + clean
+exit. So the fork-child + trio signal plumbing IS healthy
+in isolation. The hang appears only with the full tractor
+subactor runtime on top.
+
+### Negative test: full tractor subactor + orphan-SIGINT
+
+Equivalent to the xfail test. Traceback dump via
+`faulthandler.register(SIGUSR1, all_threads=True)` at the
+stuck moment:
+
+```
+Current thread 0x00007... [subint-forkserv] (most recent call first):
+  File ".../trio/_core/_io_epoll.py", line 245 in get_events
+  File ".../trio/_core/_run.py", line 2415 in run
+  File "tractor/spawn/_entry.py", line 162 in _trio_main
+  File "tractor/_child.py", line 72 in _actor_child_main
+  File "tractor/spawn/_subint_forkserver.py", line 650 in _child_target
+  File "tractor/spawn/_subint_forkserver.py", line 308 in _worker
+  File ".../threading.py", line 1024 in run
+```
+
+### Thread + signal-mask inventory of the stuck subactor
+
+Single thread (`tid == pid`, comm `'subint-forkserv'`,
+which IS `threading.main_thread()` post-fork):
+
+```
+SigBlk:  0000000000000000  # nothing blocked
+SigIgn:  0000000001001000  # SIGPIPE etc (Python defaults)
+SigCgt:  0000000108000202  # bit 1 = SIGINT caught
+```
+
+Bit 1 set in `SigCgt` → SIGINT handler IS installed. So
+trio's handler IS in place at the kernel level — not a
+"handler missing" situation.
+
+### Handler identity
+
+Inside the subactor's RPC body, `signal.getsignal(SIGINT)`
+returns `<function KIManager.install.<locals>.handler at
+0x...>` — trio's own `KIManager` handler. tractor's only
+SIGINT touches are `signal.getsignal()` *reads* (to stash
+into `debug.DebugStatus._trio_handler`); nothing writes
+over trio's handler outside the debug-REPL shielding path
+(`devx/debug/_tty_lock.py::shield_sigint`) which isn't
+engaged here (no debug_mode).
+
+## Ruled out
+
+- **GIL starvation / signal-pipe-full** (class A,
+  `subint_sigint_starvation_issue.md`): subactor runs on
+  its own GIL (separate OS process), not sharing with the
+  parent → no cross-process GIL contention. And `strace`-
+  equivalent in the signal mask shows SIGINT IS caught,
+  not queued.
+- **Orphaned channel park** (`subint_cancel_delivery_hang_issue.md`):
+  different failure mode — that one has trio iterating
+  normally and getting wedged on an orphaned
+  `chan.recv()` AFTER teardown. Here trio's event loop
+  itself never wakes.
+- **Tractor explicitly catching + swallowing KBI**:
+  greppable — the one `except KeyboardInterrupt:` in the
+  runtime is the INTENTIONAL cancel-path catch at
+  `_trio_main:164`. `async_main` uses `except Exception`
+  (not BaseException), so KBI should propagate through
+  cleanly if it ever fires.
+- **Missing `signal.set_wakeup_fd` (main-thread
+  restriction)**: post-fork, the fork-worker thread IS
+  `threading.main_thread()`, so trio's main-thread check
+  passes and its wakeup-fd install should succeed.
+
+## Root cause hypothesis (unverified)
+
+The SIGINT handler fires but trio's wakeup-fd write does
+not wake `epoll_wait`. Candidate causes, ranked by
+plausibility:
+
+1. **Wakeup-fd lifecycle race around tractor IPC setup.**
+   `async_main` spins up an IPC server + `process_messages`
+   loops early. Somewhere in that path the wakeup-fd that
+   trio registered with its epoll instance may be
+   closed/replaced/clobbered, so subsequent SIGINT writes
+   land on an fd that's no longer in the epoll set.
+   Evidence needed: compare
+   `signal.set_wakeup_fd(-1)` return value inside a
+   post-tractor-bringup RPC body vs. a pre-bringup
+   equivalent. If they differ, that's it.
+2. **Shielded cancel scope around `process_messages`.**
+   The RPC message loop is likely wrapped in a trio cancel
+   scope; if that scope is `shield=True` at any outer
+   layer, KBI scheduled at a checkpoint could be absorbed
+   by the shield and never bubble out to `_trio_main`.
+3. **Pre-fork wakeup-fd inheritance.** trio in the PARENT
+   process registered a wakeup-fd with its own epoll. The
+   child inherits the fd number but not the parent's
+   epoll instance — if tractor/trio re-uses the parent's
+   stale fd number anywhere, writes would go to a no-op
+   fd. (This is the least likely — `trio.run()` on the
+   child calls `KIManager.install` which should install a
+   fresh wakeup-fd from scratch.)
+
+## Cross-backend scope question
+
+**Untested**: does the same orphan-SIGINT hang reproduce
+against the `trio_proc` backend (stock subprocess + exec)?
+If yes → pre-existing tractor bug, independent of
+`subint_forkserver`. If no → something specific to the
+fork-from-worker path (e.g. inherited fds, mid-epoll-setup
+interference).
+
+**Quick repro for trio_proc**:
+
+```python
+# save as /tmp/trio_proc_orphan_sigint_repro.py
+import os, sys, signal, time, glob
+import subprocess as sp
+
+SCRIPT = '''
+import os, sys, trio, tractor
+async def _sleep_forever():
+    print(f"CHILD_PID={os.getpid()}", flush=True)
+    await trio.sleep_forever()
+
+async def _main():
+    async with (
+        tractor.open_root_actor(registry_addrs=[("127.0.0.1", 12350)]),
+        tractor.open_nursery() as an,
+    ):
+        await an.run_in_actor(_sleep_forever, name="sf-child")
+        print(f"PARENT_READY={os.getpid()}", flush=True)
+        await trio.sleep_forever()
+
+trio.run(_main)
+'''
+
+proc = sp.Popen(
+    [sys.executable, '-c', SCRIPT],
+    stdout=sp.PIPE, stderr=sp.STDOUT,
+)
+# parse CHILD_PID + PARENT_READY off proc.stdout ...
+# SIGKILL parent, SIGINT child, poll.
+```
+
+If that hangs too, open a broader issue; if not, this is
+`subint_forkserver`-specific (likely fd-inheritance-related).
+
+## Why this is ours to fix (not CPython's)
+
+- Signal IS delivered (`SigCgt` bitmask confirms).
+- Handler IS installed (trio's `KIManager`).
+- Thread identity is correct post-fork.
+- `_trio_main` already has the intentional KBI→clean-exit
+  path waiting to fire.
+
+Every CPython-level precondition is met. Something in
+tractor's runtime or trio's integration with it is
+breaking the SIGINT→wakeup→event-loop-wake pipeline.
+
+## Possible fix directions
+
+1. **Audit the wakeup-fd across tractor's IPC bringup.**
+   Add a trio startup hook that captures
+   `signal.set_wakeup_fd(-1)` at `_trio_main` entry,
+   after `async_main` enters, and periodically — assert
+   it's unchanged. If it moves, track down the writer.
+2. **Explicit `signal.set_wakeup_fd` reset after IPC
+   setup.** Brute force: re-install a fresh wakeup-fd
+   mid-bringup. Band-aid, but fast to try.
+3. **Ensure no `shield=True` cancel scope envelopes the
+   RPC-message-loop / IPC-server task.** If one does,
+   KBI-at-checkpoint never escapes.
+4. **Once fixed, the `child_sigint='trio'` mode on
+   `subint_forkserver_proc`** becomes effectively a no-op
+   or a doc-only mode — trio's natural handler already
+   does the right thing. Might end up removing the flag
+   entirely if there's no behavioral difference between
+   modes.
+
+## Current workaround
+
+None; `child_sigint` defaults to `'ipc'` (IPC cancel is
+the only reliable cancel path today), and the xfail test
+documents the gap. Operators hitting orphan-SIGINT get a
+hung process that needs `SIGKILL`.
+
+## Reproducer
+
+Inline, standalone (no pytest):
+
+```python
+# save as /tmp/orphan_sigint_repro.py  (py3.14+)
+import os, sys, signal, time, glob, trio
+import tractor
+from tractor.spawn._subint_forkserver import (
+    fork_from_worker_thread,
+)
+
+async def _sleep_forever():
+    print(f'SUBACTOR[{os.getpid()}]', flush=True)
+    await trio.sleep_forever()
+
+async def _main():
+    async with (
+        tractor.open_root_actor(
+            registry_addrs=[('127.0.0.1', 12349)],
+        ),
+        tractor.open_nursery() as an,
+    ):
+        await an.run_in_actor(_sleep_forever, name='sf-child')
+        await trio.sleep_forever()
+
+def child_target() -> int:
+    from tractor.spawn._spawn import try_set_start_method
+    try_set_start_method('subint_forkserver')
+    trio.run(_main)
+    return 0
+
+pid = fork_from_worker_thread(child_target, thread_name='repro')
+time.sleep(3.0)
+
+# find the subactor pid via /proc
+children = []
+for path in glob.glob(f'/proc/{pid}/task/*/children'):
+    with open(path) as f:
+        children.extend(int(x) for x in f.read().split() if x)
+subactor_pid = children[0]
+
+# SIGKILL root → orphan the subactor
+os.kill(pid, signal.SIGKILL)
+os.waitpid(pid, 0)
+time.sleep(0.3)
+
+# SIGINT the orphan — should cause clean trio exit
+os.kill(subactor_pid, signal.SIGINT)
+
+# poll for exit
+for _ in range(100):
+    try:
+        os.kill(subactor_pid, 0)
+        time.sleep(0.1)
+    except ProcessLookupError:
+        print('HARNESS: subactor exited cleanly ✔')
+        sys.exit(0)
+os.kill(subactor_pid, signal.SIGKILL)
+print('HARNESS: subactor hung — reproduced')
+sys.exit(1)
+```
+
+Expected (current): `HARNESS: subactor hung — reproduced`.
+
+After fix: `HARNESS: subactor exited cleanly ✔`.
+
+## References
+
+- `tractor/spawn/_entry.py::_trio_main:157-186` — the
+  intentional KBI→clean-exit path this bug makes
+  unreachable.
+- `tractor/spawn/_subint_forkserver` — the backend whose
+  orphan cancel-robustness this blocks.
+- `tests/spawn/test_subint_forkserver.py::test_orphaned_subactor_sigint_cleanup_DRAFT`
+  — the xfail'd reproducer in the test suite.
+- `ai/conc-anal/subint_cancel_delivery_hang_issue.md` —
+  sibling "orphaned channel park" hang (different class).
+- `ai/conc-anal/subint_sigint_starvation_issue.md` —
+  sibling "GIL starvation SIGINT drop" hang (different
+  class).
+- tractor issue #379 — subint backend tracking.

ai/conc-anal/subint_forkserver_test_cancellation_leak_issue.md

@@ -0,0 +1,851 @@
+# `subint_forkserver` backend: `test_cancellation.py` multi-level cancel cascade hang
+
+> **Tracked at:** [#449](https://github.com/goodboy/tractor/issues/449)
+
+Follow-up tracker: surfaced while wiring the new
+`subint_forkserver` spawn backend into the full tractor
+test matrix (step 2 of the post-backend-lands plan).
+See also
+`ai/conc-anal/subint_forkserver_orphan_sigint_hang_issue.md`
+— sibling tracker for a different forkserver-teardown
+class which probably shares the same fundamental root
+cause (fork-FD-inheritance across nested spawns).
+
+## TL;DR
+
+`tests/test_cancellation.py::test_nested_multierrors[subint_forkserver]`
+hangs indefinitely under our new backend. The hang is
+**inside the graceful IPC cancel cascade** — every actor
+in the multi-level tree parks in `epoll_wait` waiting
+for IPC messages that never arrive. Not a hard-kill /
+tree-reap issue (we don't reach the hard-kill fallback
+path at all).
+
+Working hypothesis (unverified): **`os.fork()` from a
+subactor inherits the root parent's IPC listener socket
+FDs**. When a first-level subactor forkserver-spawns a
+grandchild, that grandchild inherits both its direct
+spawner's FDs AND the root's FDs — IPC message routing
+becomes ambiguous (or silently sends to the wrong
+channel), so the cancel cascade can't reach its target.
+
+## Corrected diagnosis vs. earlier draft
+
+An earlier version of this doc claimed the root cause
+was **"forkserver teardown doesn't tree-kill
+descendants"** (SIGKILL only reaches the direct child,
+grandchildren survive and hold TCP `:1616`). That
+diagnosis was **wrong**, caused by conflating two
+observations:
+
+1. *5-zombie leak holding :1616* — happened in my own
+   workflow when I aborted a bg pytest task with
+   `pkill` (SIGTERM/SIGKILL, not SIGINT). The abrupt
+   kill skipped the graceful `ActorNursery.__aexit__`
+   cancel cascade entirely, orphaning descendants to
+   init. **This was my cleanup bug, not a forkserver
+   teardown bug.** Codified the fix (SIGINT-first +
+   bounded wait before SIGKILL) in
+   `feedback_sc_graceful_cancel_first.md` +
+   `.claude/skills/run-tests/SKILL.md`.
+2. *`test_nested_multierrors` hangs indefinitely* —
+   the real, separate, forkserver-specific bug
+   captured by this doc.
+
+The two symptoms are unrelated. The tree-kill / setpgrp
+fix direction proposed earlier would not help (1) (SC-
+graceful-cleanup is the right answer there) and would
+not help (2) (the hang is in the cancel cascade, not
+in the hard-kill fallback).
+
+## Symptom
+
+Reproducer (py3.14, clean env):
+
+```sh
+# preflight: ensure clean env
+ss -tlnp 2>/dev/null | grep ':1616' && echo 'FOUL — cleanup first!' || echo 'clean'
+
+./py314/bin/python -m pytest --spawn-backend=subint_forkserver \
+  'tests/test_cancellation.py::test_nested_multierrors[subint_forkserver]' \
+  --timeout=30 --timeout-method=thread --tb=short -v
+```
+
+Expected: `pytest-timeout` fires at 30s with a thread-
+dump banner, but the process itself **remains alive
+after timeout** and doesn't unwedge on subsequent
+SIGINT. Requires SIGKILL to reap.
+
+## Evidence (tree structure at hang point)
+
+All 5 processes are kernel-level `S` (sleeping) in
+`do_epoll_wait` (trio's event loop waiting on I/O):
+
+```
+PID     PPID    THREADS  NAME             ROLE
+333986  1       2        subint-forkserv  pytest main (the test body)
+333993  333986  3        subint-forkserv  "child 1" spawner subactor
+  334003 333993 1        subint-forkserv  grandchild errorer under child-1
+  334014 333993 1        subint-forkserv  grandchild errorer under child-1
+333999  333986  1        subint-forkserv  "child 2" spawner subactor (NO grandchildren!)
+```
+
+### Asymmetric tree depth
+
+The test's `spawn_and_error(breadth=2, depth=3)` should
+have BOTH direct children spawning 2 grandchildren
+each, going 3 levels deep. Reality:
+
+- Child 1 (333993, 3 threads) DID spawn its two
+  grandchildren as expected — fully booted trio
+  runtime.
+- Child 2 (333999, 1 thread) did NOT spawn any
+  grandchildren — clearly never completed its
+  nursery's first `run_in_actor`. Its 1-thread state
+  suggests the runtime never fully booted (no trio
+  worker threads for `waitpid`/IPC).
+
+This asymmetry is the key clue: the two direct
+children started identically but diverged. Probably a
+race around fork-inherited state (listener FDs,
+subactor-nursery channel state) that happens to land
+differently depending on spawn ordering.
+
+### Parent-side state
+
+Thread-dump of pytest main (333986) at the hang:
+
+- Main trio thread — parked in
+  `trio._core._io_epoll.get_events` (epoll_wait on
+  its event loop). Waiting for IPC from children.
+- Two trio-cache worker threads — each parked in
+  `outcome.capture(sync_fn)` calling
+  `os.waitpid(child_pid, 0)`. These are our
+  `_ForkedProc.wait()` off-loads. They're waiting for
+  the direct children to exit — but children are
+  stuck in their own epoll_wait waiting for IPC from
+  the parent.
+
+**It's a deadlock, not a leak:** the parent is
+correctly running `soft_kill(proc, _ForkedProc.wait,
+portal)` (graceful IPC cancel via
+`Portal.cancel_actor()`), but the children never
+acknowledge the cancel message (or the message never
+reaches them through the tangled post-fork IPC).
+
+## What's NOT the cause (ruled out)
+
+- **`_ForkedProc.kill()` only SIGKILLs direct pid /
+  missing tree-kill**: doesn't apply — we never reach
+  the hard-kill path. The deadlock is in the graceful
+  cancel cascade.
+- **Port `:1616` contention**: ruled out after the
+  `reg_addr` fixture-wiring fix; each test session
+  gets a unique port now.
+- **GIL starvation / SIGINT pipe filling** (class-A,
+  `subint_sigint_starvation_issue.md`): doesn't apply
+  — each subactor is its own OS process with its own
+  GIL (not legacy-config subint).
+- **Child-side `_trio_main` absorbing KBI**: grep
+  confirmed; `_trio_main` only catches KBI at the
+  `trio.run()` callsite, which is reached only if the
+  trio loop exits normally. The children here never
+  exit trio.run() — they're wedged inside.
+
+## Hypothesis: FD inheritance across nested forks
+
+`subint_forkserver_proc` calls
+`fork_from_worker_thread()` which ultimately does
+`os.fork()` from a dedicated worker thread. Standard
+Linux/POSIX fork semantics: **the child inherits ALL
+open FDs from the parent**, including listener
+sockets, epoll fds, trio wakeup pipes, and the
+parent's IPC channel sockets.
+
+At root-actor fork-spawn time, the root's IPC server
+listener FDs are open in the parent. Those get
+inherited by child 1. Child 1 then forkserver-spawns
+its OWN subactor (grandchild). The grandchild
+inherits FDs from child 1 — but child 1's address
+space still contains **the root's IPC listener FDs
+too** (inherited at first fork). So the grandchild
+has THREE sets of FDs:
+
+1. Its own (created after becoming a subactor).
+2. Its direct parent child-1's.
+3. The ROOT's (grandparent's) — inherited transitively.
+
+IPC message routing may be ambiguous in this tangled
+state. Or a listener socket that the root thinks it
+owns is actually open in multiple processes, and
+messages sent to it go to an arbitrary one. That
+would exactly match the observed "graceful cancel
+never propagates".
+
+This hypothesis predicts the bug **scales with fork
+depth**: single-level forkserver spawn
+(`test_subint_forkserver_spawn_basic`) works
+perfectly, but any test that spawns a second level
+deadlocks. Matches observations so far.
+
+## Fix directions (to validate)
+
+### 1. `close_fds=True` equivalent in `fork_from_worker_thread()`
+
+`subprocess.Popen` / `trio.lowlevel.open_process` have
+`close_fds=True` by default on POSIX — they
+enumerate open FDs in the child post-fork and close
+everything except stdio + any explicitly-passed FDs.
+Our raw `os.fork()` doesn't. Adding the equivalent to
+our `_worker` prelude would isolate each fork
+generation's FD set.
+
+Implementation sketch in
+`tractor.spawn._subint_forkserver.fork_from_worker_thread._worker`:
+
+```python
+def _worker() -> None:
+    pid: int = os.fork()
+    if pid == 0:
+        # CHILD: close inherited FDs except stdio + the
+        # pid-pipe we just opened.
+        keep: set[int] = {0, 1, 2, rfd, wfd}
+        import resource
+        soft, _ = resource.getrlimit(resource.RLIMIT_NOFILE)
+        os.closerange(3, soft)  # blunt; or enumerate /proc/self/fd
+        # ... then child_target() as before
+```
+
+Problem: overly aggressive — closes FDs the
+grandchild might legitimately need (e.g. its parent's
+IPC channel for the spawn-spec handshake, if we rely
+on that). Needs thought about which FDs are
+"inheritable and safe" vs. "inherited by accident".
+
+### 2. Cloexec on tractor's own FDs
+
+Set `FD_CLOEXEC` on tractor-created sockets (listener
+sockets, IPC channel sockets, pipes). This flag
+causes automatic close on `execve`, but since we
+`fork()` without `exec()`, this alone doesn't help.
+BUT — combined with a child-side explicit close-
+non-cloexec loop, it gives us a way to mark "my
+private FDs" vs. "safe to inherit". Most robust, but
+requires tractor-wide audit.
+
+### 3. Explicit FD cleanup in `_ForkedProc`/`_child_target`
+
+Have `subint_forkserver_proc`'s `_child_target`
+closure explicitly close the parent-side IPC listener
+FDs before calling `_actor_child_main`. Requires
+being able to enumerate "the parent's listener FDs
+that the child shouldn't keep" — plausible via
+`Actor.ipc_server`'s socket objects.
+
+### 4. Use `os.posix_spawn` with explicit `file_actions`
+
+Instead of raw `os.fork()`, use `os.posix_spawn()`
+which supports explicit file-action specifications
+(close this FD, dup2 that FD). Cleaner semantics, but
+probably incompatible with our "no exec" requirement
+(subint_forkserver is a fork-without-exec design).
+
+**Likely correct answer: (3) — targeted FD cleanup
+via `actor.ipc_server` handle.** (1) is too blunt,
+(2) is too wide-ranging, (4) changes the spawn
+mechanism.
+
+## Reproducer (standalone, no pytest)
+
+```python
+# save as /tmp/forkserver_nested_hang_repro.py  (py3.14+)
+import trio, tractor
+
+async def assert_err():
+    assert 0
+
+async def spawn_and_error(breadth: int = 2, depth: int = 1):
+    async with tractor.open_nursery() as n:
+        for i in range(breadth):
+            if depth > 0:
+                await n.run_in_actor(
+                    spawn_and_error,
+                    breadth=breadth,
+                    depth=depth - 1,
+                    name=f'spawner_{i}_{depth}',
+                )
+            else:
+                await n.run_in_actor(
+                    assert_err,
+                    name=f'errorer_{i}',
+                )
+
+async def _main():
+    async with tractor.open_nursery() as n:
+        for i in range(2):
+            await n.run_in_actor(
+                spawn_and_error,
+                name=f'top_{i}',
+                breadth=2,
+                depth=1,
+            )
+
+if __name__ == '__main__':
+    from tractor.spawn._spawn import try_set_start_method
+    try_set_start_method('subint_forkserver')
+    with trio.fail_after(20):
+        trio.run(_main)
+```
+
+Expected (current): hangs on `trio.fail_after(20)`
+— children never ack the error-propagation cancel
+cascade. Pattern: top 2 direct children, 4
+grandchildren, 1 errorer deadlocks while trying to
+unwind through its parent chain.
+
+After fix: `trio.TooSlowError`-free completion; the
+root's `open_nursery` receives the
+`BaseExceptionGroup` containing the `AssertionError`
+from the errorer and unwinds cleanly.
+
+## Update — 2026-04-23: partial fix landed, deeper layer surfaced
+
+Three improvements landed as separate commits in the
+`subint_forkserver_backend` branch (see `git log`):
+
+1. **`_close_inherited_fds()` in fork-child prelude**
+   (`tractor/spawn/_subint_forkserver.py`). POSIX
+   close-fds-equivalent enumeration via
+   `/proc/self/fd` (or `RLIMIT_NOFILE` fallback), keep
+   only stdio. This is fix-direction (1) from the list
+   above — went with the blunt form rather than the
+   targeted enum-via-`actor.ipc_server` form, turns
+   out the aggressive close is safe because every
+   inheritable resource the fresh child needs
+   (IPC-channel socket, etc.) is opened AFTER the
+   fork anyway.
+2. **`_ForkedProc.wait()` via `os.pidfd_open()` +
+   `trio.lowlevel.wait_readable()`** — matches the
+   `trio.Process.wait` / `mp.Process.sentinel` pattern
+   used by `trio_proc` and `proc_waiter`. Gives us
+   fully trio-cancellable child-wait (prior impl
+   blocked a cache thread on a sync `os.waitpid` that
+   was NOT trio-cancellable due to
+   `abandon_on_cancel=False`).
+3. **`_parent_chan_cs` wiring** in
+   `tractor/runtime/_runtime.py`: capture the shielded
+   `loop_cs` for the parent-channel `process_messages`
+   task in `async_main`; explicitly cancel it in
+   `Actor.cancel()` teardown. This breaks the shield
+   during teardown so the parent-chan loop exits when
+   cancel is issued, instead of parking on a parent-
+   socket EOF that might never arrive under fork
+   semantics.
+
+**Concrete wins from (1):** the sibling
+`subint_forkserver_orphan_sigint_hang_issue.md` class
+is **now fixed** — `test_orphaned_subactor_sigint_cleanup_DRAFT`
+went from strict-xfail to pass. The xfail mark was
+removed; the test remains as a regression guard.
+
+**test_nested_multierrors STILL hangs** though.
+
+### Updated diagnosis (narrowed)
+
+DIAGDEBUG instrumentation of `process_messages` ENTER/
+EXIT pairs + `_parent_chan_cs.cancel()` call sites
+showed (captured during a 20s-timeout repro):
+
+- 80 `process_messages` ENTERs, 75 EXITs → 5 stuck.
+- **All 40 `shield=True` ENTERs matched EXIT** — every
+  shielded parent-chan loop exits cleanly. The
+  `_parent_chan_cs` wiring works as intended.
+- **The 5 stuck loops are all `shield=False`** — peer-
+  channel handlers (inbound connections handled by
+  `handle_stream_from_peer` in stream_handler_tn).
+- After our `_parent_chan_cs.cancel()` fires, NEW
+  shielded process_messages loops start (on the
+  session reg_addr port — probably discovery-layer
+  reconnection attempts). These don't block teardown
+  (they all exit) but indicate the cancel cascade has
+  more moving parts than expected.
+
+### Remaining unknown
+
+Why don't the 5 peer-channel loops exit when
+`service_tn.cancel_scope.cancel()` fires? They're in
+`stream_handler_tn` which IS `service_tn` in the
+current configuration (`open_ipc_server(parent_tn=
+service_tn, stream_handler_tn=service_tn)`). A
+standard nursery-scope-cancel should propagate through
+them — no shield, no special handler. Something
+specific to the fork-spawned configuration keeps them
+alive.
+
+Candidate follow-up experiments:
+
+- Dump the trio task tree at the hang point (via
+  `stackscope` or direct trio introspection) to see
+  what each stuck loop is awaiting. `chan.__anext__`
+  on a socket recv? An inner lock? A shielded sub-task?
+- Compare peer-channel handler lifecycle under
+  `trio_proc` vs `subint_forkserver` with equivalent
+  logging to spot the divergence.
+- Investigate whether the peer handler is caught in
+  the `except trio.Cancelled:` path at
+  `tractor/ipc/_server.py:448` that re-raises — but
+  re-raise means it should still exit. Unless
+  something higher up swallows it.
+
+### Attempted fix (DID NOT work) — hypothesis (3)
+
+Tried: in `_serve_ipc_eps` finally, after closing
+listeners, also iterate `server._peers` and
+sync-close each peer channel's underlying stream
+socket fd:
+
+```python
+for _uid, _chans in list(server._peers.items()):
+    for _chan in _chans:
+        try:
+            _stream = _chan._transport.stream if _chan._transport else None
+            if _stream is not None:
+                _stream.socket.close()  # sync fd close
+        except (AttributeError, OSError):
+            pass
+```
+
+Theory: closing the socket fd from outside the stuck
+recv task would make the recv see EBADF /
+ClosedResourceError and unblock.
+
+Result: `test_nested_multierrors[subint_forkserver]`
+still hangs identically. Either:
+- The sync `socket.close()` doesn't propagate into
+  trio's in-flight `recv_some()` the way I expected
+  (trio may hold an internal reference that keeps the
+  fd open even after an external close), or
+- The stuck recv isn't even the root blocker and the
+  peer handlers never reach the finally for some
+  reason I haven't understood yet.
+
+Either way, the sync-close hypothesis is **ruled
+out**. Reverted the experiment, restored the skip-
+mark on the test.
+
+### Aside: `-s` flag does NOT change `test_nested_multierrors` behavior
+
+Tested explicitly: both with and without `-s`, the
+test hangs identically. So the capture-pipe-fill
+hypothesis is **ruled out** for this test.
+
+The earlier `test_context_stream_semantics.py` `-s`
+observation was most likely caused by a competing
+pytest run in my session (confirmed via process list
+— my leftover pytest was alive at that time and
+could have been holding state on the default
+registry port).
+
+## Update — 2026-04-23 (late): cancel delivery ruled in, nursery-wait ruled BLOCKER
+
+**New diagnostic run** instrumented
+`handle_stream_from_peer` at ENTER / `except
+trio.Cancelled:` / finally, plus `Actor.cancel()`
+just before `self._parent_chan_cs.cancel()`. Result:
+
+- **40 `handle_stream_from_peer` ENTERs**.
+- **0 `except trio.Cancelled:` hits** — cancel
+  never fires on any peer-handler.
+- **35 finally hits** — those handlers exit via
+  peer-initiated EOF (normal return), NOT cancel.
+- **5 handlers never reach finally** — stuck forever.
+- **`Actor.cancel()` fired in 12 PIDs** — but the
+  PIDs with peer handlers that DIDN'T fire
+  Actor.cancel are exactly **root + 2 direct
+  spawners**. These 3 actors have peer handlers
+  (for their own subactors) that stay stuck because
+  **`Actor.cancel()` at these levels never runs**.
+
+### The actual deadlock shape
+
+`Actor.cancel()` lives in
+`open_root_actor.__aexit__` / `async_main` teardown.
+That only runs when the enclosing `async with
+tractor.open_nursery()` exits. The nursery's
+`__aexit__` calls the backend `*_proc` spawn target's
+teardown, which does `soft_kill() →
+_ForkedProc.wait()` on its child PID. That wait is
+trio-cancellable via pidfd now (good) — but nothing
+CANCELS it because the outer scope only cancels when
+`Actor.cancel()` runs, which only runs when the
+nursery completes, which waits on the child.
+
+It's a **multi-level mutual wait**:
+
+```
+root              blocks on spawner.wait()
+  spawner         blocks on grandchild.wait()
+    grandchild    blocks on errorer.wait()
+      errorer     Actor.cancel() ran, but process
+                  may not have fully exited yet
+                  (something in root_tn holding on?)
+```
+
+Each level waits for the level below. The bottom
+level (errorer) reaches Actor.cancel(), but its
+process may not fully exit — meaning its pidfd
+doesn't go readable, meaning the grandchild's
+waitpid doesn't return, meaning the grandchild's
+nursery doesn't unwind, etc. all the way up.
+
+### Refined question
+
+**Why does an errorer process not exit after its
+`Actor.cancel()` completes?**
+
+Possibilities:
+1. `_parent_chan_cs.cancel()` fires (shielded
+   parent-chan loop unshielded), but the task is
+   stuck INSIDE the shielded loop's recv in a way
+   that cancel still can't break.
+2. After `Actor.cancel()` returns, `async_main`
+   still has other tasks in `root_tn` waiting for
+   something that never arrives (e.g. outbound
+   IPC reply delivery).
+3. The `os._exit(rc)` in `_worker` (at
+   `_subint_forkserver.py`) doesn't run because
+   `_child_target` never returns.
+
+Next-session candidate probes (in priority order):
+
+1. **Instrument `_worker`'s fork-child branch** to
+   confirm whether `child_target()` returns (and
+   thus `os._exit(rc)` is reached) for errorer
+   PIDs. If yes → process should die; if no →
+   trace back into `_actor_child_main` /
+   `_trio_main` / `async_main` to find the stuck
+   spot.
+2. **Instrument `async_main`'s final unwind** to
+   see which await in the teardown doesn't
+   complete.
+3. **Compare under `trio_proc` backend** at the
+   same `_worker`-equivalent level to see where
+   the flows diverge.
+
+### Rule-out: NOT a stuck peer-chan recv
+
+Earlier hypothesis was that the 5 stuck peer-chan
+loops were blocked on a socket recv that cancel
+couldn't interrupt. This pass revealed the real
+cause: cancel **never reaches those tasks** because
+their owning actor's `Actor.cancel()` never runs.
+The recvs are fine — they're just parked because
+nothing is telling them to stop.
+
+## Update — 2026-04-23 (very late): leaves exit, middle actors stuck in `trio.run`
+
+Yet another instrumentation pass — this time
+printing at:
+
+- `_worker` child branch: `pre child_target()` /
+  `child_target RETURNED rc=N` / `about to
+  os._exit(rc)` 
+- `_trio_main`: `about to trio.run` /
+  `trio.run RETURNED NORMALLY` / `FINALLY`
+
+**Fresh-run results** (`test_nested_multierrors[
+subint_forkserver]`, depth=1/breadth=2, 1 root + 14
+forked = 15 actors total):
+
+- **9 processes completed the full flow** —
+  `trio.run RETURNED NORMALLY` → `child_target
+  RETURNED rc=0` → `about to os._exit(0)`. These
+  are the LEAVES of the tree (errorer actors) plus
+  their direct parents (depth-0 spawners). They
+  actually exit their processes.
+- **5 processes are stuck INSIDE `trio.run(trio_main)`**
+  — they hit "about to trio.run" but NEVER see
+  "trio.run RETURNED NORMALLY". These are root +
+  top-level spawners + one intermediate.
+
+**What this means:** `async_main` itself is the
+deadlock holder, not the peer-channel loops.
+Specifically, the outer `async with root_tn:` in
+`async_main` never exits for the 5 stuck actors.
+Their `trio.run` never returns → `_trio_main`
+catch/finally never runs → `_worker` never reaches
+`os._exit(rc)` → the PROCESS never dies → its
+parent's `_ForkedProc.wait()` blocks → parent's
+nursery hangs → parent's `async_main` hangs → ...
+
+### The new precise question
+
+**What task in the 5 stuck actors' `async_main`
+never completes?** Candidates:
+
+1. The shielded parent-chan `process_messages`
+   task in `root_tn` — but we explicitly cancel it
+   via `_parent_chan_cs.cancel()` in `Actor.cancel()`.
+   However, `Actor.cancel()` only runs during
+   `open_root_actor.__aexit__`, which itself runs
+   only after `async_main`'s outer unwind — which
+   doesn't happen. So the shield isn't broken.
+
+2. `await actor_nursery._join_procs.wait()` or
+   similar in the inline backend `*_proc` flow.
+
+3. `_ForkedProc.wait()` on a grandchild that
+   actually DID exit — but the pidfd_open watch
+   didn't fire for some reason (race between
+   pidfd_open and the child exiting?).
+
+The most specific next probe: **add DIAG around
+`_ForkedProc.wait()` enter/exit** to see whether
+the pidfd-based wait returns for every grandchild
+exit. If a stuck parent's `_ForkedProc.wait()`
+NEVER returns despite its child exiting, the
+pidfd mechanism has a race bug under nested
+forkserver.
+
+Alternative probe: instrument `async_main`'s outer
+nursery exits to find which nursery's `__aexit__`
+is stuck, drilling down from `trio.run` to the
+specific `async with` that never completes.
+
+### Cascade summary (updated tree view)
+
+```
+ROOT (pytest)                       STUCK in trio.run
+├── top_0 (spawner, d=1)            STUCK in trio.run
+│   ├── spawner_0_d1_0 (d=0)        exited (os._exit 0)
+│   │   ├── errorer_0_0             exited (os._exit 0)
+│   │   └── errorer_0_1             exited (os._exit 0)
+│   └── spawner_0_d1_1 (d=0)        exited (os._exit 0)
+│       ├── errorer_0_2             exited (os._exit 0)
+│       └── errorer_0_3             exited (os._exit 0)
+└── top_1 (spawner, d=1)            STUCK in trio.run
+    ├── spawner_1_d1_0 (d=0)        STUCK in trio.run (sibling race?)
+    │   ├── errorer_1_0             exited
+    │   └── errorer_1_1             exited
+    └── spawner_1_d1_1 (d=0)        STUCK in trio.run
+        ├── errorer_1_2             exited
+        └── errorer_1_3             exited
+```
+
+Grandchildren (d=0 spawners) exit OR stick —
+asymmetric. Not purely depth-determined. Some race
+condition in nursery teardown when multiple
+siblings error simultaneously.
+
+## Update — 2026-04-23 (late, probe iteration 3): hang pinpointed to `wait_for_no_more_peers()`
+
+Further DIAGDEBUG at every milestone in `async_main`
+(runtime UP / EXITED service_tn / EXITED root_tn /
+FINALLY ENTER / RETURNING) plus `_ForkedProc.wait`
+ENTER/RETURNED per-pidfd. Result:
+
+**Every stuck actor reaches `async_main: FINALLY
+ENTER` but NOT `async_main: RETURNING`.**
+
+That isolates the hang to a specific await in
+`async_main`'s finally block at
+`tractor/runtime/_runtime.py:1837+`. The suspect:
+
+```python
+# Ensure all peers (actors connected to us as clients) are finished
+if ipc_server := actor.ipc_server and ipc_server.has_peers(check_chans=True):
+    ...
+    await ipc_server.wait_for_no_more_peers()  # ← UNBOUNDED, blocks forever
+```
+
+`_no_more_peers` is an `Event` set only when
+`server._peers` empties (see
+`ipc/_server.py:526-530`). If ANY peer-handler is
+stuck (the 5 unclosed loops from the earlier pass),
+it keeps its channel in `server._peers`, so the
+event never fires, so the wait hangs.
+
+### Applied fix (partial, landed as defensive-in-depth)
+
+`tractor/runtime/_runtime.py:1981` —
+`wait_for_no_more_peers()` call now wrapped in
+`trio.move_on_after(3.0)` + a warning log when the
+timeout fires. Commented with the full rationale.
+
+**Verified:** with this fix, ALL 15 actors reach
+`async_main: RETURNING` cleanly (up from 10/15
+reaching end before).
+
+**Unfortunately:** the test still hangs past 45s
+total — meaning there's YET ANOTHER unbounded wait
+downstream of `async_main`. The bounded
+`wait_for_no_more_peers` unblocks one level, but
+the cascade has another level above it.
+
+### Candidates for the remaining hang
+
+1. `open_root_actor`'s own finally / post-
+   `async_main` flow in `_root.py` — specifically
+   `await actor.cancel(None)` which has its own
+   internal waits.
+2. The `trio.run()` itself doesn't return even
+   after the root task completes because trio's
+   nursery still has background tasks running.
+3. Maybe `_serve_ipc_eps`'s finally has an await
+   that blocks when peers aren't clearing.
+
+### Current stance
+
+- Defensive `wait_for_no_more_peers` bound landed
+  (good hygiene regardless). Revealing a real
+  deadlock-avoidance gap in tractor's cleanup.
+- Test still hangs → skip-mark restored on
+  `test_nested_multierrors[subint_forkserver]`.
+- The full chain of unbounded waits needs another
+  session of drilling, probably at
+  `open_root_actor` / `actor.cancel` level.
+
+### Summary of this investigation's wins
+
+1. **FD hygiene fix** (`_close_inherited_fds`) —
+   correct, closed orphan-SIGINT sibling issue.
+2. **pidfd-based `_ForkedProc.wait`** — cancellable,
+   matches trio_proc pattern.
+3. **`_parent_chan_cs` wiring** —
+   `Actor.cancel()` now breaks the shielded parent-
+   chan `process_messages` loop.
+4. **`wait_for_no_more_peers` bounded** —
+   prevents the actor-level finally hang.
+5. **Ruled-out hypotheses:** tree-kill missing
+   (wrong), stuck socket recv (wrong).
+6. **Pinpointed remaining unknown:** at least one
+   more unbounded wait in the teardown cascade
+   above `async_main`. Concrete candidates
+   enumerated above.
+
+## Update — 2026-04-23 (VERY late): pytest capture pipe IS the final gate
+
+After landing fixes 1-4 and instrumenting every
+layer down to `tractor_test`'s `trio.run(_main)`:
+
+**Empirical result: with `pytest -s` the test PASSES
+in 6.20s.** Without `-s` (default `--capture=fd`) it
+hangs forever.
+
+DIAG timeline for the root pytest PID (with `-s`
+implied from later verification):
+
+```
+tractor_test: about to trio.run(_main)
+open_root_actor: async_main task started, yielding to test body
+_main: about to await wrapped test fn
+_main: wrapped RETURNED cleanly        ← test body completed!
+open_root_actor: about to actor.cancel(None)
+Actor.cancel ENTER req_chan=False
+Actor.cancel RETURN
+open_root_actor: actor.cancel RETURNED
+open_root_actor: outer FINALLY
+open_root_actor: finally END (returning from ctxmgr)
+tractor_test: trio.run FINALLY (returned or raised)  ← trio.run fully returned!
+```
+
+`trio.run()` fully returns. The test body itself
+completes successfully (pytest.raises absorbed the
+expected `BaseExceptionGroup`). What blocks is
+**pytest's own stdout/stderr capture** — under
+`--capture=fd` default, pytest replaces the parent
+process's fd 1,2 with pipe write-ends it's reading
+from. Fork children inherit those pipe fds
+(because `_close_inherited_fds` correctly preserves
+stdio). High-volume subactor error-log tracebacks
+(7+ actors each logging multiple
+`RemoteActorError`/`ExceptionGroup` tracebacks on
+the error-propagation cascade) fill the 64KB Linux
+pipe buffer. Subactor writes block. Subactor can't
+progress. Process doesn't exit. Parent's
+`_ForkedProc.wait` (now pidfd-based and
+cancellable, but nothing's cancelling here since
+the test body already completed) keeps the pipe
+reader alive... but pytest isn't draining its end
+fast enough because test-teardown/fixture-cleanup
+is in progress.
+
+**Actually** the exact mechanism is slightly
+different: pytest's capture fixture MIGHT be
+actively reading, but faster-than-writer subactors
+overflow its internal buffer. Or pytest might be
+blocked itself on the finalization step.
+
+Either way, `-s` conclusively fixes it.
+
+### Why I ruled this out earlier (and shouldn't have)
+
+Earlier in this investigation I tested
+`test_nested_multierrors` with/without `-s` and
+both hung. That's because AT THAT TIME, fixes 1-4
+weren't all in place yet. The test was hanging at
+multiple deeper levels long before reaching the
+"generate lots of error-log output" phase. Once
+the cascade actually tore down cleanly, enough
+output was produced to hit the capture-pipe limit.
+
+**Classic order-of-operations mistake in
+debugging:** ruling something out too early based
+on a test that was actually failing for a
+different reason.
+
+### Fix direction (next session)
+
+Redirect subactor stdout/stderr to `/dev/null` (or
+a session-scoped log file) in the fork-child
+prelude, right after `_close_inherited_fds()`. This
+severs the inherited pytest-capture pipes and lets
+subactor output flow elsewhere. Under normal
+production use (non-pytest), stdout/stderr would
+be the TTY — we'd want to keep that. So the
+redirect should be conditional or opt-in via the
+`child_sigint`/proc_kwargs flag family.
+
+Alternative: document as a gotcha and recommend
+`pytest -s` for any tests using the
+`subint_forkserver` backend with multi-level actor
+trees. Simpler, user-visible, no code change.
+
+### Current state
+
+- Skip-mark on `test_nested_multierrors[subint_forkserver]`
+  restored with reason pointing here.
+- Test confirmed passing with `-s` after all 4
+  cascade fixes applied.
+- The 4 cascade fixes are NOT wasted — they're
+  correct hardening regardless of the capture-pipe
+  issue, AND without them we'd never reach the
+  "actually produces enough output to fill the
+  pipe" state.
+
+## Stopgap (landed)
+
+`test_nested_multierrors` skip-marked under
+`subint_forkserver` via
+`@pytest.mark.skipon_spawn_backend('subint_forkserver',
+reason='...')`, cross-referenced to this doc. Mark
+should be dropped once the peer-channel-loop exit
+issue is fixed.
+
+## References
+
+- `tractor/spawn/_subint_forkserver.py::fork_from_worker_thread`
+  — the primitive whose post-fork FD hygiene is
+  probably the culprit.
+- `tractor/spawn/_subint_forkserver.py::subint_forkserver_proc`
+  — the backend function that orchestrates the
+  graceful cancel path hitting this bug.
+- `tractor/spawn/_subint_forkserver.py::_ForkedProc`
+  — the `trio.Process`-compatible shim; NOT the
+  failing component (confirmed via thread-dump).
+- `tests/test_cancellation.py::test_nested_multierrors`
+  — the test that surfaced the hang.
+- `ai/conc-anal/subint_forkserver_orphan_sigint_hang_issue.md`
+  — sibling hang class; probably same underlying
+  fork-FD-inheritance root cause.
+- tractor issue #379 — subint backend tracking.

ai/conc-anal/subint_forkserver_thread_constraints_on_pep684_issue.md

@@ -0,0 +1,186 @@
+# Revisit `subint_forkserver` thread-cache constraints once msgspec PEP 684 support lands
+
+> **Tracked at:** [#450](https://github.com/goodboy/tractor/issues/450)
+
+Follow-up tracker for cleanup work gated on the msgspec
+PEP 684 adoption upstream ([jcrist/msgspec#563](https://github.com/jcrist/msgspec/issues/563)).
+
+Context — why this exists
+-------------------------
+
+The `tractor.spawn._subint_forkserver` submodule currently
+carries two "non-trio" thread-hygiene constraints whose
+necessity is tangled with issues that *should* dissolve
+under PEP 684 isolated-mode subinterpreters:
+
+1. `fork_from_worker_thread()` / `run_subint_in_worker_thread()`
+   internally allocate a **dedicated `threading.Thread`**
+   rather than using `trio.to_thread.run_sync()`.
+2. The test helper is named
+   `run_fork_in_non_trio_thread()` — the
+   `non_trio` qualifier is load-bearing today.
+
+This doc catalogs *why* those constraints exist, which of
+them isolated-mode would fix, and what the
+audit-and-cleanup path looks like once msgspec #563 is
+resolved.
+
+The three reasons the constraints exist
+---------------------------------------
+
+### 1. GIL-starvation class → fixed by PEP 684 isolated mode
+
+The class-A hang documented in
+`subint_sigint_starvation_issue.md` is entirely about
+legacy-config subints **sharing the main GIL**. Once
+msgspec #563 lands and tractor flips
+`tractor.spawn._subint` to
+`concurrent.interpreters.create()` (isolated config), each
+subint gets its own GIL. Abandoned subint threads can't
+contend for main's GIL → can't starve the main trio loop
+→ signal-wakeup-pipe drains normally → no SIGINT-drop.
+
+This class of hazard **dissolves entirely**. The
+non-trio-thread requirement for *this reason* disappears.
+
+### 2. Destroy race / tstate-recycling → orthogonal; unclear
+
+The `subint_proc` dedicated-thread fix (commit `26fb8206`)
+addressed a different issue: `_interpreters.destroy(interp_id)`
+was blocking on a trio-cache worker that had run an
+earlier `interp.exec()` for that subint. Working
+hypothesis at the time was "the cached thread retains the
+subint's tstate".
+
+But tstate-handling is **not specific to GIL mode** —
+`_PyXI_Enter` / `_PyXI_Exit` (the C-level machinery both
+configs use to enter/leave a subint from a thread) should
+restore the caller's tstate regardless of GIL config. So
+isolated mode **doesn't obviously fix this**. It might be:
+
+- A py3.13 bug fixed in later versions — we saw the race
+  first on 3.13 and never re-tested on 3.14 after moving
+  to dedicated threads.
+- A genuine CPython quirk around cached threads that
+  exec'd into a subint, persisting across GIL modes.
+- Something else we misdiagnosed — the empirical fix
+  (dedicated thread) worked but the analysis may have
+  been incomplete.
+
+Only way to know: once we're on isolated mode, empirically
+retry `trio.to_thread.run_sync(interp.exec, ...)` and see
+if `destroy()` still blocks. If it does, keep the
+dedicated thread; if not, one constraint relaxed.
+
+### 3. Fork-from-main-interp-tstate (the constraint in this module's helper names)
+
+The fork-from-main-interp-tstate invariant — CPython's
+`PyOS_AfterFork_Child` →
+`_PyInterpreterState_DeleteExceptMain` gate documented in
+`subint_fork_blocked_by_cpython_post_fork_issue.md` — is
+about the calling thread's **current** tstate at the
+moment `os.fork()` runs. If trio's cache threads never
+enter subints at all, their tstate is plain main-interp,
+and fork from them would be fine.
+
+The reason the smoke test +
+`run_fork_in_non_trio_thread` test helper
+currently use a dedicated `threading.Thread` is narrow:
+**we don't want to risk a trio cache thread that has
+previously been used as a subint driver being the one that
+picks up the fork job**. If cached tstate doesn't get
+cleared (back to reason #2), the fork's child-side
+post-init would see the wrong interp and abort.
+
+In an isolated-mode world where msgspec works:
+
+- `subint_proc` would use the public
+  `concurrent.interpreters.create()` + `Interpreter.exec()`
+  / `Interpreter.close()` — which *should* handle tstate
+  cleanly (they're the "blessed" API).
+- If so, trio's cache threads are safe to fork from
+  regardless of whether they've previously driven subints.
+- → the `non_trio` qualifier in
+  `run_fork_in_non_trio_thread` becomes
+  *overcautious* rather than load-bearing, and the
+  dedicated-thread primitives in `_subint_forkserver.py`
+  can likely be replaced with straight
+  `trio.to_thread.run_sync()` wrappers.
+
+TL;DR
+-----
+
+| constraint | fixed by isolated mode? |
+|---|---|
+| GIL-starvation (class A) | **yes** |
+| destroy race on cached worker | unclear — empirical test on py3.14 + isolated API required |
+| fork-from-main-tstate requirement on worker | **probably yes, conditional on the destroy-race question above** |
+
+If #2 also resolves on py3.14+ with isolated mode,
+tractor could drop the `non_trio` qualifier from the fork
+helper's name and just use `trio.to_thread.run_sync(...)`
+for everything. But **we shouldn't do that preemptively**
+— the current cautious design is cheap (one dedicated
+thread per fork / per subint-exec) and correct.
+
+Audit plan when msgspec #563 lands
+----------------------------------
+
+Assuming msgspec grows `Py_mod_multiple_interpreters`
+support:
+
+1. **Flip `tractor.spawn._subint` to isolated mode.** Drop
+   the `_interpreters.create('legacy')` call in favor of
+   the public API (`concurrent.interpreters.create()` +
+   `Interpreter.exec()` / `Interpreter.close()`). Run the
+   three `ai/conc-anal/subint_*_issue.md` reproducers —
+   class-A (`test_stale_entry_is_deleted` etc.) should
+   pass without the `skipon_spawn_backend('subint')` marks
+   (revisit the marker inventory).
+
+2. **Empirical destroy-race retest.** In `subint_proc`,
+   swap the dedicated `threading.Thread` back to
+   `trio.to_thread.run_sync(Interpreter.exec, ...,
+   abandon_on_cancel=False)` and run the full subint test
+   suite. If `Interpreter.close()` (or the backing
+   destroy) blocks the same way as the legacy version
+   did, revert and keep the dedicated thread.
+
+3. **If #2 clean**, audit `_subint_forkserver.py`:
+   - Rename `run_fork_in_non_trio_thread` → drop the
+     `_non_trio_` qualifier (e.g. `run_fork_in_thread`) or
+     inline the two-line `trio.to_thread.run_sync` call at
+     the call sites and drop the helper entirely.
+   - Consider whether `fork_from_worker_thread` +
+     `run_subint_in_worker_thread` still warrant being
+     separate module-level primitives or whether they
+     collapse into a compound
+     `trio.to_thread.run_sync`-driven pattern inside the
+     (future) `subint_forkserver_proc` backend.
+
+4. **Doc fallout.** `subint_sigint_starvation_issue.md`
+   and `subint_cancel_delivery_hang_issue.md` both cite
+   the legacy-GIL-sharing architecture as the root cause.
+   Close them with commit-refs to the isolated-mode
+   migration. This doc itself should get a closing
+   post-mortem section noting which of #1/#2/#3 actually
+   resolved vs persisted.
+
+References
+----------
+
+- `tractor.spawn._subint_forkserver` — the in-tree module
+  whose constraints this doc catalogs.
+- `ai/conc-anal/subint_sigint_starvation_issue.md` — the
+  GIL-starvation class.
+- `ai/conc-anal/subint_cancel_delivery_hang_issue.md` —
+  sibling Ctrl-C-able hang class.
+- `ai/conc-anal/subint_fork_blocked_by_cpython_post_fork_issue.md`
+  — why fork-from-subint is blocked (this drives the
+  forkserver-via-non-subint-thread workaround).
+- `ai/conc-anal/subint_fork_from_main_thread_smoketest.py`
+  — empirical validation for the workaround.
+- [PEP 684 — per-interpreter GIL](https://peps.python.org/pep-0684/)
+- [PEP 734 — `concurrent.interpreters` public API](https://peps.python.org/pep-0734/)
+- [jcrist/msgspec#563 — PEP 684 support tracker](https://github.com/jcrist/msgspec/issues/563)
+- tractor issue #379 — subint backend tracking.

ai/conc-anal/subint_sigint_starvation_issue.md

@@ -0,0 +1,350 @@
+# `subint` backend: abandoned-subint thread can wedge main trio event loop (Ctrl-C unresponsive)
+
+Follow-up to the Phase B subint spawn-backend PR (see
+`tractor.spawn._subint`, issue #379). The hard-kill escape
+hatch we landed (`_HARD_KILL_TIMEOUT`, bounded shields,
+`daemon=True` driver-thread abandonment) handles *most*
+stuck-subint scenarios cleanly, but there's one class of
+hang that can't be fully escaped from within tractor: a
+still-running abandoned sub-interpreter can starve the
+**parent's** trio event loop to the point where **SIGINT is
+effectively dropped by the kernel ↔ Python boundary** —
+making the pytest process un-Ctrl-C-able.
+
+## Symptom
+
+Running `test_stale_entry_is_deleted[subint]` under
+`--spawn-backend=subint`:
+
+1. Test spawns a subactor (`transport_fails_actor`) which
+   kills its own IPC server and then
+   `trio.sleep_forever()`.
+2. Parent tries `Portal.cancel_actor()` → channel
+   disconnected → fast return.
+3. Nursery teardown triggers our `subint_proc` cancel path.
+   Portal-cancel fails (dead channel),
+   `_HARD_KILL_TIMEOUT` fires, driver thread is abandoned
+   (`daemon=True`), `_interpreters.destroy(interp_id)`
+   raises `InterpreterError` (because the subint is still
+   running).
+4. Test appears to hang indefinitely at the *outer*
+   `async with tractor.open_nursery() as an:` exit.
+5. `Ctrl-C` at the terminal does nothing. The pytest
+   process is un-interruptable.
+
+## Evidence
+
+### `strace` on the hung pytest process
+
+```
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(37, "\2", 1) = -1 EAGAIN (Resource temporarily unavailable)
+rt_sigreturn({mask=[WINCH]}) = 140585542325792
+```
+
+Translated:
+
+- Kernel delivers `SIGINT` to pytest.
+- CPython's C-level signal handler fires and tries to
+  write the signal number byte (`0x02` = SIGINT) to fd 37
+  — the **Python signal-wakeup fd** (set via
+  `signal.set_wakeup_fd()`, which trio uses to wake its
+  event loop on signals).
+- Write returns `EAGAIN` — **the pipe is full**. Nothing
+  is draining it.
+- `rt_sigreturn` with the signal masked off — signal is
+  "handled" from the kernel's perspective but the actual
+  Python-level handler (and therefore trio's
+  `KeyboardInterrupt` delivery) never runs.
+
+### Stack dump (via `tractor.devx.dump_on_hang`)
+
+At 20s into the hang, only the **main thread** is visible:
+
+```
+Thread 0x...7fdca0191780 [python] (most recent call first):
+  File ".../trio/_core/_io_epoll.py", line 245 in get_events
+  File ".../trio/_core/_run.py", line 2415 in run
+  File ".../tests/discovery/test_registrar.py", line 575 in test_stale_entry_is_deleted
+  ...
+```
+
+No driver thread shows up. The abandoned-legacy-subint
+thread still exists from the OS's POV (it's still running
+inside `_interpreters.exec()` driving the subint's
+`trio.run()` on `trio.sleep_forever()`) but the **main
+interp's faulthandler can't see threads currently executing
+inside a sub-interpreter's tstate**. Concretely: the thread
+is alive, holding state we can't introspect from here.
+
+## Root cause analysis
+
+The most consistent explanation for both observations:
+
+1. **Legacy-config subinterpreters share the main GIL.**
+   PEP 734's public `concurrent.interpreters.create()`
+   defaults to `'isolated'` (per-interp GIL), but tractor
+   uses `_interpreters.create('legacy')` as a workaround
+   for C extensions that don't yet support PEP 684
+   (notably `msgspec`, see
+   [jcrist/msgspec#563](https://github.com/jcrist/msgspec/issues/563)).
+   Legacy-mode subints share process-global state
+   including the GIL.
+
+2. **Our abandoned subint thread never exits.** After our
+   hard-kill timeout, `driver_thread.join()` is abandoned
+   via `abandon_on_cancel=True` and the thread is
+   `daemon=True` so proc-exit won't block on it — but the
+   thread *itself* is still alive inside
+   `_interpreters.exec()`, driving a `trio.run()` that
+   will never return (the subint actor is in
+   `trio.sleep_forever()`).
+
+3. **`_interpreters.destroy()` cannot force-stop a running
+   subint.** It raises `InterpreterError` on any
+   still-running subinterpreter; there is no public
+   CPython API to force-destroy one.
+
+4. **Shared-GIL + non-terminating subint thread → main
+   trio loop starvation.** Under enough load (the subint's
+   trio event loop iterating in the background, IPC-layer
+   tasks still in the subint, etc.) the main trio event
+   loop can fail to iterate frequently enough to drain its
+   wakeup pipe. Once that pipe fills, `SIGINT` writes from
+   the C signal handler return `EAGAIN` and signals are
+   silently dropped — exactly what `strace` shows.
+
+The shielded
+`await actor_nursery._join_procs.wait()` at the top of
+`subint_proc` (inherited unchanged from the `trio_proc`
+pattern) is structurally involved too: if main trio *does*
+get a schedule slice, it'd find the `subint_proc` task
+parked on `_join_procs` under shield — which traps whatever
+`Cancelled` arrives. But that's a second-order effect; the
+signal-pipe-full condition is the primary "Ctrl-C doesn't
+work" cause.
+
+## Why we can't fix this from inside tractor
+
+- **No force-destroy API.** CPython provides neither a
+  `_interpreters.force_destroy()` nor a thread-
+  cancellation primitive (`pthread_cancel` is actively
+  discouraged and unavailable on Windows). A subint stuck
+  in pure-Python loops (or worse, C code that doesn't poll
+  for signals) is structurally unreachable from outside.
+- **Shared GIL is the root scheduling issue.** As long as
+  we're forced into legacy-mode subints for `msgspec`
+  compatibility, the abandoned-thread scenario is
+  fundamentally a process-global GIL-starvation window.
+- **`signal.set_wakeup_fd()` is process-global.** Even if
+  we wanted to put our own drainer on the wakeup pipe,
+  only one party owns it at a time.
+
+## Current workaround
+
+- **Fixture-side SIGINT loop on the `daemon` subproc** (in
+  this test's `daemon: subprocess.Popen` fixture in
+  `tests/conftest.py`). The daemon dying closes its end of
+  the registry IPC, which unblocks a pending recv in main
+  trio's IPC-server task, which lets the event loop
+  iterate, which drains the wakeup pipe, which finally
+  delivers the test-harness SIGINT.
+- **Module-level skip on py3.13**
+  (`pytest.importorskip('concurrent.interpreters')`) — the
+  private `_interpreters` C module exists on 3.13 but the
+  multi-trio-task interaction hangs silently there
+  independently of this issue.
+
+## Path forward
+
+1. **Primary**: upstream `msgspec` PEP 684 adoption
+   ([jcrist/msgspec#563](https://github.com/jcrist/msgspec/issues/563)).
+   Unlocks `concurrent.interpreters.create()` isolated
+   mode → per-interp GIL → abandoned subint threads no
+   longer starve the parent's main trio loop. At that
+   point we can flip `_subint.py` back to the public API
+   (`create()` / `Interpreter.exec()` / `Interpreter.close()`)
+   and drop the private `_interpreters` path.
+
+2. **Secondary**: watch CPython for a public
+   force-destroy primitive. If something like
+   `Interpreter.close(force=True)` lands, we can use it as
+   a hard-kill final stage and actually tear down
+   abandoned subints.
+
+3. **Harness-level**: document the fixture-side SIGINT
+   loop pattern as the "known workaround" for subint-
+   backend tests that can leave background state holding
+   the main event loop hostage.
+
+## References
+
+- PEP 734 (`concurrent.interpreters`):
+  <https://peps.python.org/pep-0734/>
+- PEP 684 (per-interpreter GIL):
+  <https://peps.python.org/pep-0684/>
+- `msgspec` PEP 684 tracker:
+  <https://github.com/jcrist/msgspec/issues/563>
+- CPython `_interpretersmodule.c` source:
+  <https://github.com/python/cpython/blob/main/Modules/_interpretersmodule.c>
+- `tractor.spawn._subint` module docstring (in-tree
+  explanation of the legacy-mode choice and its
+  tradeoffs).
+
+## Reproducer
+
+```
+./py314/bin/python -m pytest \
+  tests/discovery/test_registrar.py::test_stale_entry_is_deleted \
+  --spawn-backend=subint \
+  --tb=short --no-header -v
+```
+
+Hangs indefinitely without the fixture-side SIGINT loop;
+with the loop, the test completes (albeit with the
+abandoned-thread warning in logs).
+
+## Additional known-hanging tests (same class)
+
+All three tests below exhibit the same
+signal-wakeup-fd-starvation fingerprint (`write() → EAGAIN`
+on the wakeup pipe after enough SIGINT attempts) and
+share the same structural cause — abandoned legacy-subint
+driver threads contending with the main interpreter for
+the shared GIL until the main trio loop can no longer
+drain its wakeup pipe fast enough to deliver signals.
+
+They're listed separately because each exposes the class
+under a different load pattern worth documenting.
+
+### `tests/discovery/test_registrar.py::test_stale_entry_is_deleted[subint]`
+
+Original exemplar — see the **Symptom** and **Evidence**
+sections above. One abandoned subint
+(`transport_fails_actor`, stuck in `trio.sleep_forever()`
+after self-cancelling its IPC server) is sufficient to
+tip main into starvation once the harness's `daemon`
+fixture subproc keeps its half of the registry IPC alive.
+
+### `tests/test_cancellation.py::test_cancel_while_childs_child_in_sync_sleep[subint-False]`
+
+Cancel a grandchild that's in sync Python sleep from 2
+nurseries up. The test's own docstring declares the
+dependency: "its parent should issue a 'zombie reaper' to
+hard kill it after sufficient timeout" — which for
+`trio`/`mp_*` is an OS-level `SIGKILL` of the grandchild
+subproc. **Under `subint` there's no equivalent** (no
+public CPython API to force-destroy a running
+sub-interpreter), so the grandchild's sync-sleeping
+`trio.run()` persists inside its abandoned driver thread
+indefinitely. The nested actor-tree (parent → child →
+grandchild, all subints) means a single cancel triggers
+multiple concurrent hard-kill abandonments, each leaving
+a live driver thread.
+
+This test often only manifests the starvation under
+**full-suite runs** rather than solo execution —
+earlier-in-session subint tests also leave abandoned
+driver threads behind, and the combined population is
+what actually tips main trio into starvation. Solo runs
+may stay Ctrl-C-able with fewer abandoned threads in the
+mix.
+
+### `tests/test_cancellation.py::test_multierror_fast_nursery[subint-25-0.5]`
+
+Nursery-error-path throughput stress-test parametrized
+for **25 concurrent subactors**. When the multierror
+fires and the nursery cancels, every subactor goes
+through our `subint_proc` teardown. The bounded
+hard-kills run in parallel (all `subint_proc` tasks are
+sibling trio tasks), so the timeout budget is ~3s total
+rather than 3s × 25. After that, **25 abandoned
+`daemon=True` driver threads are simultaneously alive** —
+an extreme pressure multiplier on the same mechanism.
+
+The `strace` fingerprint is striking under this load: six
+or more **successful** `write(16, "\2", 1) = 1` calls
+(main trio getting brief GIL slices, each long enough to
+drain exactly one wakeup-pipe byte) before finally
+saturating with `EAGAIN`:
+
+```
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(16, "\2", 1)                      = 1
+rt_sigreturn({mask=[WINCH]})            = 140141623162400
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(16, "\2", 1)                      = 1
+rt_sigreturn({mask=[WINCH]})            = 140141623162400
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(16, "\2", 1)                      = 1
+rt_sigreturn({mask=[WINCH]})            = 140141623162400
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(16, "\2", 1)                      = 1
+rt_sigreturn({mask=[WINCH]})            = 140141623162400
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(16, "\2", 1)                      = 1
+rt_sigreturn({mask=[WINCH]})            = 140141623162400
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(16, "\2", 1)                      = 1
+rt_sigreturn({mask=[WINCH]})            = 140141623162400
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(16, "\2", 1)                      = -1 EAGAIN (Resource temporarily unavailable)
+rt_sigreturn({mask=[WINCH]})            = 140141623162400
+```
+
+Those successful writes indicate CPython's
+`sys.getswitchinterval()`-based GIL round-robin *is*
+giving main brief slices — just never long enough to run
+the Python-level signal handler through to the point
+where trio converts the delivered SIGINT into a
+`Cancelled` on the appropriate scope. Once the
+accumulated write rate outpaces main's drain rate, the
+pipe saturates and subsequent signals are silently
+dropped.
+
+The `pstree` below (pid `530060` = hung `pytest`) shows
+the subint-driver thread population at the moment of
+capture. Even with fewer than the full 25 shown (pstree
+truncates thread names to `subint-driver[<interp_id>` —
+interpreters `3` and `4` visible across 16 thread
+entries), the GIL-contender count is more than enough to
+explain the starvation:
+
+```
+>>> pstree -snapt 530060
+systemd,1 --switched-root --system --deserialize=40
+  └─login,1545 --
+      └─bash,1872
+          └─sway,2012
+              └─alacritty,70471 -e xonsh
+                  └─xonsh,70487 .../bin/xonsh
+                      └─uv,70955 run xonsh
+                          └─xonsh,70959 .../py314/bin/xonsh
+                              └─python,530060 .../py314/bin/pytest -v tests/test_cancellation.py --spawn-backend=subint
+                                  ├─{subint-driver[3},531857
+                                  ├─{subint-driver[3},531860
+                                  ├─{subint-driver[3},531862
+                                  ├─{subint-driver[3},531866
+                                  ├─{subint-driver[3},531877
+                                  ├─{subint-driver[3},531882
+                                  ├─{subint-driver[3},531884
+                                  ├─{subint-driver[3},531945
+                                  ├─{subint-driver[3},531950
+                                  ├─{subint-driver[3},531952
+                                  ├─{subint-driver[4},531956
+                                  ├─{subint-driver[4},531959
+                                  ├─{subint-driver[4},531961
+                                  ├─{subint-driver[4},531965
+                                  ├─{subint-driver[4},531968
+                                  └─{subint-driver[4},531979
+```
+
+(`pstree` uses `{...}` to denote threads rather than
+processes — these are all the **driver OS-threads** our
+`subint_proc` creates with name
+`f'subint-driver[{interp_id}]'`. Every one of them is
+still alive, executing `_interpreters.exec()` inside a
+sub-interpreter our hard-kill has abandoned. At 16+
+abandoned driver threads competing for the main GIL, the
+main-interpreter trio loop gets starved and signal
+delivery stalls.)

ai/conc-anal/test_register_duplicate_name_daemon_connect_race_issue.md

@@ -0,0 +1,273 @@
+# `test_register_duplicate_name` racy connect-failure on `daemon` fixture readiness
+
+## Symptom
+
+`tests/test_multi_program.py::test_register_duplicate_name`
+fails intermittently under BOTH transports + ALL spawn
+backends with connect-refused errors:
+
+```
+# under --tpt-proto=uds
+FAILED tests/test_multi_program.py::test_register_duplicate_name
+- ConnectionRefusedError: [Errno 111] Connection refused
+( ^^^ this exc was collapsed from a group ^^^ )
+
+# under --tpt-proto=tcp
+FAILED tests/test_multi_program.py::test_register_duplicate_name
+- OSError: all attempts to connect to 127.0.0.1:36003 failed
+( ^^^ this exc was collapsed from a group ^^^ )
+```
+
+Distinct from the cancel-cascade `TooSlowError` flake
+class — see
+`cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`.
+This is a **connect-time race** before the daemon is
+fully ready to `accept()`, not a teardown-cascade
+slowness.
+
+## Root cause: blind `time.sleep()` in `daemon` fixture
+
+`tests/conftest.py::daemon` boots a sub-py-process via
+`subprocess.Popen([python, '-c', 'tractor.run_daemon(...)'])`,
+then **blindly sleeps** a fixed delay before yielding
+`proc` to the test:
+
+```python
+# excerpt from tests/conftest.py::daemon
+proc = subprocess.Popen([
+    sys.executable, '-c', code,
+])
+
+bg_daemon_spawn_delay: float = _PROC_SPAWN_WAIT  # 0.6
+if tpt_proto == 'uds':
+    bg_daemon_spawn_delay += 1.6
+if _non_linux and ci_env:
+    bg_daemon_spawn_delay += 1
+
+# XXX, allow time for the sub-py-proc to boot up.
+# !TODO, see ping-polling ideas above!
+time.sleep(bg_daemon_spawn_delay)
+
+assert not proc.returncode
+yield proc
+```
+
+Inherent fragility: the delay is "long enough on dev
+boxes most of the time" but has no actual
+synchronization with the daemon's `bind()` + `listen()`
+completion. Under any of:
+
+- Loaded box (CI parallelism, big rebuild in
+  background, low-cpu-freq)
+- Cold first-run (`importlib` cache miss, JIT warmup)
+- Higher-than-expected `tractor` import cost
+- Filesystem latency (UDS sockfile create, slow
+  tmpfs)
+
+...the sleep finishes BEFORE the daemon has bound its
+listen socket → first test client call to
+`tractor.find_actor()` / `wait_for_actor()` /
+`open_nursery(registry_addrs=[reg_addr])`'s implicit
+connect → `ConnectionRefusedError` (TCP) or
+`FileNotFoundError`/`ConnectionRefusedError` (UDS).
+
+## Reproducer
+
+Easiest: run the suite under load.
+
+```bash
+# create CPU pressure on another core in parallel
+stress-ng --cpu 2 --timeout 600s &
+
+./py313/bin/python -m pytest \
+  tests/test_multi_program.py::test_register_duplicate_name \
+  --spawn-backend=main_thread_forkserver \
+  --tpt-proto=tcp -v
+```
+
+Reproduces ~30-50% of the time on a dev laptop. On a
+quiet idle box, may need 5-10 runs to hit.
+
+## Why the existing `_PROC_SPAWN_WAIT` tuning is
+inadequate
+
+Recent `bg_daemon_spawn_delay` rename
+(de-monotonic-grow fix) just-shipped removed the
+*accumulation* bug where each invocation made the
+NEXT test's wait longer too. Net effect: every
+invocation now uses the SAME `0.6 + 1.6` (UDS) or
+`0.6` (TCP) sleep, no growth. Good — but does
+NOTHING for the underlying race. Each individual
+test still relies on a blind sleep that may or may
+not be sufficient.
+
+Bumping the constant higher pushes flake rate down
+but never to zero AND adds dead time to every
+non-flaking run. Not a fix, just a knob.
+
+## Side effects
+
+- **Inter-test cascade**: a single failure can cascade
+  via leaked subprocesses (the `daemon` fixture's
+  cleanup may not fully tear down a daemon that never
+  reached "ready"). The `_reap_orphaned_subactors`
+  session-end + `_track_orphaned_uds_per_test`
+  per-test fixtures handle most of this now, but the
+  affected test itself still fails.
+- **Worsens under fork-spawn backends**: the daemon
+  has more init work
+  (`_main_thread_forkserver`-coordinator-thread
+  startup, etc.) so the sleep has to cover MORE.
+
+## Fix design — replace blind sleep with active poll
+
+The right primitive is **poll the daemon's bind
+address until it accepts a connection or we time
+out**, with the timeout being a hard ceiling rather
+than a baseline. Two implementation paths:
+
+### Path A — TCP/UDS connect-poll loop
+
+Try `socket.connect(reg_addr)` in a tight loop with
+short backoff (~50ms), succeed on the first non-error
+return, fail-loud on a hard cap (e.g. 10s). Same
+primitive works for both transports because both use
+`socket.connect()` semantics.
+
+Rough shape:
+
+```python
+def _wait_for_daemon_ready(
+    reg_addr,
+    tpt_proto: str,
+    timeout: float = 10.0,
+    poll_interval: float = 0.05,
+) -> None:
+    deadline = time.monotonic() + timeout
+    while True:
+        if tpt_proto == 'tcp':
+            sock = socket.socket(socket.AF_INET)
+            target = reg_addr  # (host, port)
+        else:  # uds
+            sock = socket.socket(socket.AF_UNIX)
+            target = os.path.join(*reg_addr)
+        try:
+            sock.settimeout(poll_interval)
+            sock.connect(target)
+        except (
+            ConnectionRefusedError,
+            FileNotFoundError,
+            socket.timeout,
+        ) as exc:
+            if time.monotonic() >= deadline:
+                raise TimeoutError(
+                    f'Daemon never accepted on {target!r} '
+                    f'within {timeout}s'
+                ) from exc
+            time.sleep(poll_interval)
+        else:
+            sock.close()
+            return
+```
+
+Pros: trivial primitive, no tractor-runtime
+dependency, works pre-yield in the fixture body,
+fail-fast on truly-broken daemon.
+Cons: doesn't actually do an IPC handshake, just
+proves listen-side is up. A daemon that bound but
+hasn't initialized its registrar table yet would
+still race.
+
+### Path B — `tractor.find_actor()` poll
+
+Use the actual discovery API the test would call:
+
+```python
+async def _wait_for_daemon_ready_via_discovery(
+    reg_addr,
+    timeout: float = 10.0,
+    poll_interval: float = 0.05,
+):
+    deadline = trio.current_time() + timeout
+    async with tractor.open_root_actor(
+        registry_addrs=[reg_addr],
+        # ephemeral root just for the probe
+    ):
+        while True:
+            try:
+                async with tractor.find_actor(
+                    'registrar',  # daemon's own name
+                    registry_addrs=[reg_addr],
+                ) as portal:
+                    if portal is not None:
+                        return
+            except Exception:
+                pass
+            if trio.current_time() >= deadline:
+                raise TimeoutError(...)
+            await trio.sleep(poll_interval)
+```
+
+Pros: actually proves the discovery path works,
+handles the "bound but not ready" case naturally.
+Cons: requires booting an ephemeral root actor JUST
+for the probe (overhead), more code, and runs in trio
+which complicates the sync-fixture context. Need a
+`trio.run()` wrapper.
+
+### Recommended: Path A with optional handshake check
+
+Path A is much simpler + handles 95% of the bug
+class. If "bound-but-not-ready" turns out to still
+race (it shouldn't — `tractor.run_daemon` doesn't
+return from `bind()` until the registrar is
+fully populated), escalate to Path B as a focused
+follow-up.
+
+## Workarounds (until fix lands)
+
+1. **Bump `_PROC_SPAWN_WAIT`** higher (current: 0.6).
+   2.0–3.0 hides most flakes at the cost of adding
+   dead time to every test. Not a fix but reduces
+   blast radius while the proper poll lands.
+2. **`pytest-rerunfailures`** with `reruns=1` on the
+   `daemon` fixture's tests specifically. Hides the
+   flake but doesn't address it.
+3. **Mark known-affected tests as `xfail(strict=False)`**
+   under `--ci`. Lets CI go green at the cost of
+   silently hiding regressions.
+
+(Recommend skipping all three — implement the active
+poll instead.)
+
+## Investigation next steps
+
+1. Implement Path A as a `_wait_for_daemon_ready()`
+   helper in `tests/conftest.py`. Replace the
+   `time.sleep(bg_daemon_spawn_delay)` call with it.
+2. Drop the `_PROC_SPAWN_WAIT` constant entirely
+   (active poll obsoletes blind sleep).
+3. Run the suite 5-10 times to validate flake rate
+   drops to 0.
+4. If flakes persist, profile whether the daemon
+   process exits with non-zero before the poll's
+   deadline hits — that'd be a different bug
+   (daemon startup crash) that the blind sleep was
+   masking.
+5. Cross-check `tests/test_multi_program.py::test_*`
+   — multiple tests use the `daemon` fixture; all
+   should benefit from the same poll primitive.
+
+## Related
+
+- `tests/conftest.py::daemon` — the fixture under
+  fix
+- `tests/conftest.py::_PROC_SPAWN_WAIT` — the
+  constant to drop
+- `cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`
+  — distinct flake class (cancel-cascade
+  `TooSlowError` at teardown, not connect-time race)
+- `trio_wakeup_socketpair_busy_loop_under_fork_issue.md`
+  — different bug entirely; this race was masked
+  pre-WakeupSocketpair-patch by the busy-loop
+  hangs.

ai/conc-anal/trio_033_cancel_cascade_slowdown_depth3_issue.md

@@ -0,0 +1,102 @@
+# `trio` 0.29 -> 0.33 slows the depth=3 cancel-cascade
+
+## Symptom
+
+After locking to `trio==0.33.0` (commit `c7741bba`, was
+`0.29.0`), this test reliably trips its `fail_after`
+deadline on the **`trio`** backend:
+
+```
+FAILED tests/test_cancellation.py::test_nested_multierrors[start_method=trio-depth=3]
+  - AssertionError: assert False
+    where False = isinstance(
+      Cancelled(source='deadline', source_task=None, reason=None),
+      tractor.RemoteActorError,
+    )
+```
+
+A `fail_after_w_trace` hang-snapshot is captured for the
+test each run (deadline-injected `Cancelled` wrapped into
+the actor-nursery `BaseExceptionGroup`).
+
+## Root cause (immediate)
+
+The test budgets `fail_after(6)` for the `trio` backend.
+That 6s was chosen (commit `32955db0`, while `trio==0.29`)
+with the assertion that trio finishes "well under" 6s.
+The `trio` 0.29 -> 0.33 bump slowed the depth=3 cascade
+past that budget, so the 6s deadline now fires mid-cascade.
+
+trio 0.33 added **cancel-reason tracking** — every
+`Cancelled` now carries `(source=, reason=, source_task=)`.
+The injected exc is `Cancelled(source='deadline')`, i.e.
+trio itself naming our `fail_after(6)` scope as the cancel
+origin. When that `Cancelled` collapses one branch of the
+nursery BEG, the test's `isinstance(subexc,
+RemoteActorError)` assertion fails. The healthy outcome is
+`BEG = [RemoteActorError, RemoteActorError]`; the
+`Cancelled` is purely an artifact of the deadline cutting
+the cascade short.
+
+## Measurements (standalone, this machine)
+
+```
+depth=1  trio   ~3.15s   PASS  (keeps 6s budget)
+depth=3  trio   ~6.8-8.2s  FAIL @ 6s  (now bumped to 12s)
+```
+
+depth=1 still fits comfortably; only depth=3 (deeper
+recursive spawn-and-error tree => more actors to reap)
+exceeds the old budget. The ~2s/depth-level cost looks
+like serialized per-actor reap / `terminate_after` waits.
+
+## Mitigation applied
+
+`test_nested_multierrors` now splits the `trio` budget:
+
+```python
+case ('trio', 1):
+    timeout = 6
+case ('trio', 3):
+    timeout = 12   # was 6; see this doc
+```
+
+This stops the deadline from firing so the cascade
+completes naturally to `[RAE, RAE]`.
+
+## Also affected — same root cause, different test
+
+`test_echoserver_detailed_mechanics[trio-raise_error=KeyboardInterrupt]`
+(`tests/test_infected_asyncio.py`) tripped the *same*
+slowdown via its much tighter `trio` budget of `1s`. The
+single-aio-subactor teardown now takes ~1s, so the `1s`
+`fail_after` raced the deadline (PASS at 0.99s / FAIL at
+1.03s across back-to-back standalone runs). On a deadline-
+fire the injected `Cancelled(source='deadline')` wraps the
+mid-stream `KeyboardInterrupt` into a `BaseExceptionGroup`,
+which is NOT a `KeyboardInterrupt` so the bare
+`pytest.raises(KeyboardInterrupt)` fails. (The sibling
+`raise_error=Exception` variant only "passes" by accident:
+an `ExceptionGroup` *is-a* `Exception`, so its
+`pytest.raises(Exception)` still matches even when wrapped.)
+
+Mitigation: bump that `trio` budget `1 -> 4s` (matching the
+forking-spawner case). Without a deadline-fire the KBI
+propagates bare and the assertion passes.
+
+## Open follow-up (the actual regression)
+
+The budget bump is a band-aid — the underlying question is
+**why** the depth=3 `trio` cancel-cascade went from <6s to
+~7-8s across `trio` 0.29 -> 0.33. Candidate avenues:
+
+- which scope owns the per-actor `terminate_after` wait,
+  and are the tree's reaps concurrent or serialized?
+- did trio 0.33's abort/reschedule or cancel-reason
+  bookkeeping change checkpoint timing on the cancel path?
+
+If/when the cascade speeds back up under-budget, depth=3
+will start completing well under 12s — at which point the
+budget can be tightened back toward 6s as a regression
+tripwire. Related (different backend, same cascade class):
+`cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`.

ai/conc-anal/trio_wakeup_socketpair_busy_loop_under_fork_issue.md

@@ -0,0 +1,221 @@
+# trio `WakeupSocketpair.drain()` busy-loop in forked child (peer-closed missed-EOF)
+
+## Reproducer
+
+```bash
+./py313/bin/python -m pytest \
+  tests/test_multi_program.py::test_register_duplicate_name \
+  --tpt-proto=tcp \
+  --spawn-backend=main_thread_forkserver \
+  -v --capture=sys
+```
+
+Subactor pegs a CPU core indefinitely; parent test
+hangs waiting for the subactor.
+
+## Empirical evidence (caught alive)
+
+```
+$ sudo strace -p <subactor-pid>
+recvfrom(6, "", 65536, 0, NULL, NULL)   = 0
+recvfrom(6, "", 65536, 0, NULL, NULL)   = 0
+recvfrom(6, "", 65536, 0, NULL, NULL)   = 0
+... (no `epoll_wait`, no other syscalls, just this back-to-back)
+```
+
+Pattern: tight C-level `recvfrom` loop returning 0
+each call. No `epoll_wait` between iterations →
+**not trio's task scheduler**. Pure synchronous C
+loop.
+
+```
+$ sudo readlink /proc/<subactor-pid>/fd/6
+socket:[<inode>]
+
+$ sudo lsof -p <subactor-pid> | grep ' 6u'
+<cmd> <pid> goodboy 6u unix 0xffff... 0t0 <inode> type=STREAM (CONNECTED)
+```
+
+fd=6 is an **AF_UNIX socket** in CONNECTED state.
+Even though the test uses `--tpt-proto=tcp`, this fd
+is NOT a tractor IPC channel — it's an internal
+trio socketpair.
+
+## Root-cause: `WakeupSocketpair.drain()`
+
+`/site-packages/trio/_core/_wakeup_socketpair.py`:
+
+```python
+class WakeupSocketpair:
+    def __init__(self) -> None:
+        self.wakeup_sock, self.write_sock = socket.socketpair()
+        self.wakeup_sock.setblocking(False)
+        self.write_sock.setblocking(False)
+        ...
+
+    def drain(self) -> None:
+        try:
+            while True:
+                self.wakeup_sock.recv(2**16)
+        except BlockingIOError:
+            pass
+```
+
+`socket.socketpair()` on Linux defaults to AF_UNIX
+SOCK_STREAM. Both ends non-blocking. Normal flow:
+
+1. Signal/wake event → `write_sock.send(b'\x00')`
+   queues a byte.
+2. `wakeup_sock` becomes readable → trio's epoll
+   triggers.
+3. Trio calls `drain()` to flush the buffer.
+4. drain loops on `wakeup_sock.recv(64KB)`.
+5. Eventually buffer empty → non-blocking socket
+   raises `BlockingIOError` → except → break.
+
+**Bug surface — peer-closed missed-EOF**:
+
+Non-blocking socket semantics:
+- buffer has data → `recv` returns N>0 bytes (loop continues)
+- buffer empty → `recv` raises `BlockingIOError`
+- **peer FIN'd → `recv` returns 0 bytes (NEITHER exception NOR
+  break — infinite tight loop)**
+
+`drain()` does not handle the `b''` return-value
+(EOF) case. If `write_sock` has been closed (or the
+process holding it is gone), every iteration returns
+0 → infinite loop → 100% CPU on a single core.
+
+## Why this triggers under `main_thread_forkserver`
+
+Under `os.fork()` from the forkserver-worker thread:
+
+1. Parent has a `WakeupSocketpair` instance with
+   `wakeup_sock=fdN`, `write_sock=fdM`. Both fds
+   open in parent.
+2. Fork → child inherits BOTH fds (kernel-level fd
+   table dup).
+3. `_close_inherited_fds()` runs in child →
+   closes everything except stdio. `wakeup_sock` and
+   `write_sock` of the parent's `WakeupSocketpair`
+   ARE closed in child.
+4. Child's trio (running fresh) creates its OWN
+   `WakeupSocketpair` → NEW fd numbers (e.g. fd 6, 7).
+5. **In `infect_asyncio` mode** the asyncio loop is
+   the host; trio runs as guest via
+   `start_guest_run`. trio still creates its
+   `WakeupSocketpair` in the I/O manager but its
+   role is different.
+
+The race window: somewhere between (3) and (5), if a
+`WakeupSocketpair` Python object reference inherited
+via COW (from parent's pre-fork heap) survives long
+enough that `drain()` is called on it AFTER its fds
+were closed but BEFORE the child's NEW socketpair
+takes over the recycled fd numbers — the recycled fd
+will be one of the child's NEW socketpair ends, whose
+peer might be FIN-flagged (e.g. parent-process
+peer-end is closed).
+
+Or simpler: the `wait_for_actor`/`find_actor` discovery
+flow in `test_register_duplicate_name` triggers an
+unusual code path where a stale `WakeupSocketpair`
+gets `drain()`-called on a fd whose peer has already
+closed.
+
+## Why `drain()` shouldn't loop indefinitely on EOF
+(upstream trio bug)
+
+Even WITHOUT fork, `drain()` should treat `b''` as
+EOF and break. The current code is correct for the
+"buffer drained on a healthy socketpair" scenario but
+incorrect for the "peer is gone" scenario. It's a
+defensive-programming gap in trio.
+
+A one-line patch upstream:
+
+```python
+def drain(self) -> None:
+    try:
+        while True:
+            data = self.wakeup_sock.recv(2**16)
+            if not data:
+                break  # peer-closed; nothing more to drain
+    except BlockingIOError:
+        pass
+```
+
+## Workarounds (until the underlying issue lands)
+
+1. **Skip-mark on the fork backend**:
+   `tests/test_multi_program.py` →
+   `pytest.mark.skipon_spawn_backend('main_thread_forkserver',
+   reason='trio WakeupSocketpair.drain busy-loop, see ai/conc-anal/trio_wakeup_socketpair_busy_loop_under_fork_issue.md')`.
+
+2. **Defensive monkey-patch in tractor's
+   forkserver-child prelude** — wrap
+   `WakeupSocketpair.drain` to handle `b''`:
+
+   ```python
+   # in `_actor_child_main` or `_close_inherited_fds`'s
+   # post-fork prelude:
+   from trio._core._wakeup_socketpair import WakeupSocketpair
+   _orig_drain = WakeupSocketpair.drain
+   def _safe_drain(self):
+       try:
+           while True:
+               data = self.wakeup_sock.recv(2**16)
+               if not data:
+                   return  # peer closed
+       except BlockingIOError:
+           pass
+   WakeupSocketpair.drain = _safe_drain
+   ```
+
+   Tracks upstream — remove once trio fixes.
+
+3. **Upstream the fix**: 1-line PR to `python-trio/trio`
+   adding `if not data: break` to `drain()`.
+
+## Investigation next steps
+
+1. **Confirm via py-spy**: when caught alive, detach
+   strace first then
+   `sudo py-spy dump --pid <subactor> --locals`. The
+   busy thread should show `drain` from `WakeupSocketpair`
+   in the call chain.
+2. **Identify which write-end peer is closed**: from
+   the inode of fd 6, look up the matching peer
+   inode via `ss -xp` and see whose process it
+   was/is.
+3. **Verify the missed-EOF hypothesis**: hand-craft a
+   minimal `WakeupSocketpair` repro:
+
+   ```python
+   from trio._core._wakeup_socketpair import WakeupSocketpair
+   ws = WakeupSocketpair()
+   ws.write_sock.close()  # simulate peer-gone
+   ws.drain()             # should hang forever
+   ```
+
+## Sibling bug
+
+`tests/test_infected_asyncio.py::test_aio_simple_error`
+hangs under the same backend with a DIFFERENT
+fingerprint (Mode-A deadlock, both parties in
+`epoll_wait`, no busy-loop). Distinct root cause —
+see `infected_asyncio_under_main_thread_forkserver_hang_issue.md`.
+
+Both share the broader theme: **trio internal-state
+initialization isn't fully fork-safe under
+`main_thread_forkserver`** for the more exotic
+dispatch paths.
+
+## See also
+
+- [#379](https://github.com/goodboy/tractor/issues/379) — subint umbrella
+- python-trio/trio#1614 — trio + fork hazards
+- `trio._core._wakeup_socketpair.WakeupSocketpair`
+  source (the smoking gun)
+- `ai/conc-anal/fork_thread_semantics_execution_vs_memory.md`
+- `ai/conc-anal/infected_asyncio_under_main_thread_forkserver_hang_issue.md`

ai/prompt-io/claude/20260406T172848Z_02b2ef1_prompt_io.md

@@ -0,0 +1,54 @@
+---
+model: claude-opus-4-6
+service: claude
+session: (ad-hoc, not tracked via conf.toml)
+timestamp: 2026-04-06T17:28:48Z
+git_ref: 02b2ef1
+scope: tests
+substantive: true
+raw_file: 20260406T172848Z_02b2ef1_prompt_io.raw.md
+---
+
+## Prompt
+
+User asked to extend `tests/test_resource_cache.py` with a test
+that reproduces the edge case fixed in commit `02b2ef18` (per-key
+locking+user tracking in `maybe_open_context()`). The bug was
+originally triggered in piker's `brokerd.kraken` backend where the
+same `acm_func` was called with different kwargs, and the old
+global `_Cache.users` counter caused:
+
+- teardown skipped for one `ctx_key` bc another key's users kept
+  the global count > 0
+- re-entry hitting `assert not resources.get(ctx_key)` during the
+  teardown window
+
+User requested a test that would fail under the old code and pass
+with the fix.
+
+## Response summary
+
+Designed and implemented `test_per_ctx_key_resource_lifecycle`
+which verifies per-`ctx_key` resource isolation by:
+
+1. Holding resource `'a'` open in a bg task
+2. Opening+closing resource `'b'` (same `acm_func`, different
+   kwargs) while `'a'` is still alive
+3. Re-opening `'b'` and asserting cache MISS — proving `'b'` was
+   torn down independently despite `'a'` keeping its own user
+   count > 0
+
+With the old global counter, phase 3 would produce a stale cache
+HIT (leaked resource) or crash on the assert.
+
+Also added a trivial `acm_with_resource(resource_id)` ACM helper
+at module level.
+
+## Files changed
+
+- `tests/test_resource_cache.py` — add `acm_with_resource` ACM +
+  `test_per_ctx_key_resource_lifecycle` test fn
+
+## Human edits
+
+None — committed as generated (pending user review).

ai/prompt-io/claude/20260406T193125Z_85f9c5d_prompt_io.md

@@ -0,0 +1,57 @@
+---
+model: claude-opus-4-6
+service: claude
+session: (ad-hoc, not tracked via conf.toml)
+timestamp: 2026-04-06T19:31:25Z
+git_ref: 85f9c5d
+scope: tests
+substantive: true
+raw_file: 20260406T193125Z_85f9c5d_prompt_io.raw.md
+---
+
+## Prompt
+
+User asked to reproduce the exact `assert not resources.get(ctx_key)`
+crash originally seen in piker's `brokerd.kraken` backend via
+`open_cached_client('kraken')`. Key constraints from user:
+
+- In piker, kwargs were the **same** (empty) so all callers
+  share one `ctx_key = (fid, ())`
+- The root issue is `_Cache.locks` being indexed by `fid`
+  rather than `ctx_key`, plus the race window between
+  `values.pop()` and `resources.pop()` in `_Cache.run_ctx`
+  (the acm `__aexit__` has checkpoints in between)
+- Mark the test `@pytest.mark.xfail` so it can be committed
+  against the unpatched code and later adjusted once the fix
+  from `9e49eddd` is applied
+
+User pointed to piker's `open_cached_client('kraken')` usage
+as the real-world pattern to model.
+
+## Response summary
+
+Added `test_moc_reentry_during_teardown` which deterministically
+reproduces the teardown race:
+
+1. A `cached_client()` acm (no params, like
+   `kraken.api.get_client()`) signals via `in_aexit` event
+   when its `__aexit__` starts, then sleeps to hold the
+   window open
+2. `use_and_exit` task enters+exits the cached resource
+3. `reenter_during_teardown` waits on `in_aexit` then
+   re-enters — landing exactly in the window where
+   `values` is popped but `resources` still exists
+4. The old `assert not resources.get(ctx_key)` fires
+5. `@pytest.mark.xfail(raises=AssertionError)` catches it
+
+Test confirmed: `XFAIL` with the exact traceback at
+`_mngrs.py:327`.
+
+## Files changed
+
+- `tests/test_resource_cache.py` — add
+  `test_moc_reentry_during_teardown` xfail test fn
+
+## Human edits
+
+None — committed as generated (pending user review).

ai/prompt-io/claude/20260406T222648Z_f086222_prompt_io.md

@@ -0,0 +1,52 @@
+---
+model: claude-opus-4-6
+service: claude
+session: (ad-hoc, not tracked via conf.toml)
+timestamp: 2026-04-06T22:26:48Z
+git_ref: f086222
+scope: code
+substantive: true
+raw_file: 20260406T222648Z_f086222_prompt_io.raw.md
+---
+
+## Prompt
+
+User applied the per-key locking patch (`f086222d`),
+removed the `@pytest.mark.xfail` from
+`test_moc_reentry_during_teardown`, and found the
+test STILL fails — now with `RuntimeError` instead
+of `AssertionError`. Asked to diagnose why the fix
+doesn't actually resolve this race.
+
+## Response summary
+
+Traced the exact scheduling sequence across three
+concurrent tasks to show that the per-`ctx_key`
+locking change doesn't close the fundamental gap:
+
+- `maybe_open_context`'s finally pops the lock and
+  sets `no_more_users` in the **exiting caller's
+  task**
+- But the actual resource cleanup (`values.pop`,
+  acm `__aexit__`, `resources.pop`) runs in the
+  **`run_ctx` task** inside `service_tn`
+- A re-entering task creates a fresh lock (old one
+  popped), acquires immediately, and hits stale
+  `resources[ctx_key]` while `run_ctx` is still in
+  `__aexit__`
+
+Identified three possible fix strategies:
+1. Let `run_ctx` own lock release/pop after
+   `resources.pop()`
+2. Add a "teardown complete" event that new callers
+   wait on
+3. Move `resources.pop()` into `run_ctx`'s inner
+   finally (before acm `__aexit__`)
+
+## Files changed
+
+No code changes — analysis only.
+
+## Human edits
+
+N/A — diagnostic output, no code generated.

ai/prompt-io/claude/20260406T222648Z_f086222_prompt_io.raw.md

@@ -0,0 +1,32 @@
+---
+model: claude-opus-4-6
+service: claude
+timestamp: 2026-04-06T22:26:48Z
+git_ref: f086222
+diff_cmd: git diff f086222~1..f086222
+---
+
+Here's the problem. The per-key locking doesn't fix this race because the **lock lifetime is decoupled from `run_ctx`'s lifetime**. Trace through what happens:
+
+**`maybe_open_context` finally** (lines 468-495):
+1. `users[ctx_key] -= 1` → 0
+2. `no_more_users.set()` → wakes `run_ctx` (but it doesn't run yet, just becomes ready)
+3. `_Cache.locks.pop(ctx_key)` → **lock is gone**
+4. `maybe_open_context` exits
+
+**`run_ctx`** now gets scheduled (lines 237-241):
+5. Inner finally: `values.pop(ctx_key)` → values gone
+6. `mng.__aexit__()` runs → `in_aexit.set()`, `await trio.sleep(10)` → **CHECKPOINT**
+
+**`reenter_during_teardown`** wakes:
+7. Enters `maybe_open_context` → no lock exists for `ctx_key` → creates **fresh** lock, acquires immediately
+8. `values[ctx_key]` → `KeyError`
+9. `resources.get(ctx_key)` → **still exists!** (step 6 hasn't reached `resources.pop()` in `run_ctx`'s outer finally yet)
+10. `raise RuntimeError('Caching resources ALREADY exist?!')`
+
+The core issue: `no_more_users.set()` (step 2) and `locks.pop()` (step 3) happen in the **exiting caller's task**, but the actual resource cleanup (`values.pop`, acm `__aexit__`, `resources.pop`) happens in the **`run_ctx` task** inside `service_tn`. There's no synchronization between "lock removed, new callers welcome" and "run_ctx has actually finished tearing down". The per-`ctx_key` lock change just made the lock more granular — it didn't close this gap.
+
+The fix needs to ensure a new caller can't acquire a lock for `ctx_key` until `run_ctx` has fully exited (including `resources.pop()`). Either:
+- **don't pop the lock in `maybe_open_context`** — let `run_ctx` release/pop it after `resources.pop()`
+- **wait on a "teardown complete" event** in the cache-miss path when stale `resources` exist
+- **pop `resources` before the acm `__aexit__`** (move `resources.pop()` into the inner finally alongside `values.pop()`)

ai/prompt-io/claude/20260413T192116Z_f851f28_prompt_io.md

@@ -0,0 +1,74 @@
+---
+model: claude-opus-4-6
+service: claude
+session: (ad-hoc, not tracked via conf.toml)
+timestamp: 2026-04-13T19:21:16Z
+git_ref: f851f28
+scope: code
+substantive: true
+---
+
+## Prompt
+
+User provided a detailed implementation plan for
+a new `test_tpt_bind_addrs.py` test suite covering
+`open_root_actor(tpt_bind_addrs=...)` — the three
+runtime code paths in `_root.py:385-450`:
+
+1. Non-registrar, no explicit bind -> random addrs
+2. Registrar, no explicit bind -> registry_addrs
+3. Explicit bind given -> `wrap_address()` + merge
+
+Plan specified 6 test functions (~10 parametrized
+variants), predicted a type-mixing bug at line 446,
+and asked for an in-flight fix if confirmed.
+
+## Response summary
+
+Created `tests/discovery/test_tpt_bind_addrs.py`
+with 9 collected test variants across 6 functions:
+
+- `test_registrar_root_tpt_bind_addrs` (3 variants:
+  `bind-eq-reg`, `bind-subset-reg`,
+  `bind-disjoint-reg`)
+- `test_non_registrar_root_tpt_bind_addrs`
+  (2 variants: `bind-same-bindspace`,
+  `bind-disjoint`)
+- `test_non_registrar_default_random_bind`
+  (baseline, no explicit bind)
+- `test_tpt_bind_addrs_as_maddr_str`
+  (multiaddr string input)
+- `test_registrar_merge_binds_union`
+  (registrar + disjoint bind -> union)
+- `test_open_nursery_forwards_tpt_bind_addrs`
+  (`open_nursery(**kwargs)` forwarding)
+
+Confirmed and fixed the predicted bug at
+`_root.py:446`: the registrar merge path mixed
+`Address` objects (`tpt_bind_addrs`) with raw tuples
+(`uw_reg_addrs`) inside `set()`, preventing
+deduplication and causing double-bind `OSError`.
+
+Fix: wrap `uw_reg_addrs` before the set union:
+```python
+# before (broken)
+tpt_bind_addrs = list(set(
+    tpt_bind_addrs + uw_reg_addrs
+))
+# after (fixed)
+tpt_bind_addrs = list(set(
+    tpt_bind_addrs
+    + [wrap_address(a) for a in uw_reg_addrs]
+))
+```
+
+All 9 tests pass after the fix.
+
+## Files changed
+
+- `tests/discovery/test_tpt_bind_addrs.py` (new)
+- `tractor/_root.py:446` (bug fix, 1 line)
+
+## Human edits
+
+N/A — pending review.

ai/prompt-io/claude/20260413T205048Z_269d939c_prompt_io.md

@@ -0,0 +1,50 @@
+---
+model: claude-opus-4-6
+service: claude
+session: 76154e65-d8e1-4b5f-9275-0ea45ba7e98a
+timestamp: 2026-04-13T20:50:48Z
+git_ref: 269d939c
+scope: code
+substantive: true
+raw_file: 20260413T205048Z_269d939c_prompt_io.raw.md
+---
+
+## Prompt
+
+Implement a `parse_endpoints()` API in
+`tractor.discovery._multiaddr` that lets downstream
+projects declare per-actor transport bind addresses
+as a service table of actor-name -> multiaddr
+strings (loaded from config, e.g. TOML `[network]`
+section). Add type aliases `EndpointsTable` and
+`ParsedEndpoints`, plus 7 unit tests covering TCP,
+UDS, tuples, mixed input, unsupported protocols, and
+edge cases.
+
+A detailed implementation plan was provided
+specifying insertion points, type signatures, test
+names, and verification commands.
+
+## Response summary
+
+Add `parse_endpoints()` function with two supporting
+type aliases to `_multiaddr.py`. The function
+iterates a `dict[str, list[str|tuple]]` service
+table and delegates each entry to the existing
+`wrap_address()` helper, which already handles maddr
+strings, raw tuples, and pre-wrapped `Address`
+objects. Seven pure unit tests (no trio runtime)
+validate all input variants and edge cases. All 22
+multiaddr tests pass.
+
+## Files changed
+
+- `tractor/discovery/_multiaddr.py` — add
+  `EndpointsTable`, `ParsedEndpoints` type aliases
+  and `parse_endpoints()` function after line 133
+- `tests/discovery/test_multiaddr.py` — add
+  `parse_endpoints` import and 7 new test functions
+
+## Human edits
+
+None — committed as generated.

ai/prompt-io/claude/20260413T205048Z_269d939c_prompt_io.raw.md

@@ -0,0 +1,32 @@
+---
+model: claude-opus-4-6
+service: claude
+timestamp: 2026-04-13T20:50:48Z
+git_ref: 269d939c
+diff_cmd: git diff 269d939c~1..269d939c
+---
+
+## Implementation output
+
+### `tractor/discovery/_multiaddr.py`
+
+> `git diff 269d939c~1..269d939c -- tractor/discovery/_multiaddr.py`
+
+Type aliases `EndpointsTable` and `ParsedEndpoints`
+plus `parse_endpoints()` helper that wraps each
+entry via `wrap_address()`.
+
+### `tests/discovery/test_multiaddr.py`
+
+> `git diff 269d939c~1..269d939c -- tests/discovery/test_multiaddr.py`
+
+Add import of `parse_endpoints` to existing import
+block, then 7 new test functions.
+
+### Test run output
+
+```
+22 passed, 1 warning in 0.05s
+```
+
+All 22 tests pass (15 existing + 7 new).

ai/prompt-io/claude/20260414T163300Z_befedc49_prompt_io.md

@@ -0,0 +1,38 @@
+---
+model: claude-opus-4-6
+service: claude
+session: multiaddr-support-rename-prefer
+timestamp: 2026-04-14T16:33:00Z
+git_ref: befedc49
+scope: code
+substantive: true
+raw_file: 20260414T163300Z_befedc49_prompt_io.raw.md
+---
+
+## Prompt
+
+Create a helper function that determines the best transport given
+actor locality (distributed vs same host). Use PID/hostname
+comparison for locality detection, apply at registry addr selection
+only (not spawn-time).
+
+## Response summary
+
+New `prefer_addr()` + `_is_local_addr()` helpers
+in `_api.py` using `socket.getaddrinfo()` and
+`ipaddress` for PID/hostname locality detection.
+Preference: UDS > local TCP > remote TCP.
+Integrated into `query_actor()` and
+`wait_for_actor()`. Also changed
+`Registrar.find_actor()` to return full addr list
+so callers can apply preference.
+
+## Files changed
+
+- `tractor/discovery/_discovery.py` → `_api.py`
+  — renamed + added `prefer_addr()`,
+  `_is_local_addr()`; updated `query_actor()` and
+  `wait_for_actor()` call sites
+- `tractor/discovery/_registry.py`
+  — `Registrar.find_actor()` returns
+  `list[UnwrappedAddress]|None`

ai/prompt-io/claude/20260414T163300Z_befedc49_prompt_io.raw.md

@@ -0,0 +1,62 @@
+---
+model: claude-opus-4-6
+service: claude
+timestamp: 2026-04-14T16:33:00Z
+git_ref: befedc49
+diff_cmd: git diff befedc49~1..befedc49
+---
+
+### `tractor/discovery/_api.py`
+
+> `git diff befedc49~1..befedc49 -- tractor/discovery/_api.py`
+
+Add `_is_local_addr()` and `prefer_addr()` transport
+preference helpers.
+
+#### `_is_local_addr(addr: Address) -> bool`
+
+Determines whether an `Address` is reachable on the
+local host:
+
+- `UDSAddress`: always returns `True`
+  (filesystem-bound, inherently local)
+- `TCPAddress`: checks if `._host` is a loopback IP
+  via `ipaddress.ip_address().is_loopback`, then
+  falls back to comparing against the machine's own
+  interface IPs via
+  `socket.getaddrinfo(socket.gethostname(), None)`
+
+#### `prefer_addr(addrs: list[UnwrappedAddress]) -> UnwrappedAddress`
+
+Selects the "best" transport address from a
+multihomed actor's address list. Wraps each
+candidate via `wrap_address()` to get typed
+`Address` objects, then classifies into three tiers:
+
+1. **UDS** (same-host guaranteed, lowest overhead)
+2. **TCP loopback / same-host IP** (local network)
+3. **TCP remote** (only option for distributed)
+
+Within each tier, the last-registered (latest) entry
+is preferred. Falls back to `addrs[-1]` if no
+heuristic matches.
+
+### `tractor/discovery/_registry.py`
+
+> `git diff befedc49~1..befedc49 -- tractor/discovery/_registry.py`
+
+`Registrar.find_actor()` return type broadened from
+single addr to `list[UnwrappedAddress]|None` — full
+addr list lets callers apply transport preference.
+
+#### Integration
+
+`query_actor()` and `wait_for_actor()` now call
+`prefer_addr(addrs)` instead of `addrs[-1]`.
+
+### Verification
+
+All discovery tests pass (13/13 non-daemon).
+`test_local.py` and `test_multi_program.py` also
+pass (daemon fixture teardown failures are
+pre-existing and unrelated).

ai/prompt-io/claude/20260417T034918Z_9703210_prompt_io.md

@@ -0,0 +1,101 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: subints-spawner-design-kickoff
+timestamp: 2026-04-17T03:49:18Z
+git_ref: 9703210
+scope: docs
+substantive: true
+raw_file: 20260417T034918Z_9703210_prompt_io.raw.md
+---
+
+## Prompt
+
+Drive the "first big boi, from GH issue" task seeded by
+`ai/prompt-io/prompts/subints_spawner.md`: design, plan
+and implement sub-interpreter (subint) spawn-backend
+support per issue #379, including (1) modularizing
+`tractor.spawn._spawn` into per-backend submods, (2) a new
+`._subint` backend, and (3) harness parametrization via the
+existing `--spawn-backend` / `start_method` pytest fixture
+in `tractor._testing.pytest`.
+
+Follow-up clarifications from the user (this turn):
+1. Pin `<3.15` on this dev branch and feature-gate subint
+   tests — chose option (a).
+2. Split Phase A (modularization) into its own PR first.
+3. Defer the `fork()`-via-subint hack to a follow-up.
+4. Harness flag is `pytest --spawn-backend <key>` CLI →
+   `start_method` fixture (prompt file updated to match).
+
+## Response summary
+
+Produced a three-phase plan and a concrete Phase A (pure
+modularization) file-split plan for user review; no code
+written yet — the green-light to start Phase A was given
+in this same turn conditional on logging this prompt-io
+entry first.
+
+Phases:
+- **A — modularize** `tractor/spawn/_spawn.py` (847 LOC):
+  keep generic machinery in `_spawn.py`, extract
+  `trio_proc` → `spawn/_trio.py`, `mp_proc` →
+  `spawn/_mp.py`. No pin bump.
+- **B — `_subint` backend**: bump `pyproject.toml`
+  `requires-python` upper to `<3.15`; add `'subint'` to
+  `SpawnMethodKey`; reuse existing UDS transport; shm
+  escape-hatch deferred.
+- **C — harness**: drive the valid-backend tuple in
+  `tractor/_testing/pytest.py:345-349` from
+  `typing.get_args(SpawnMethodKey)`; skip subint tests on
+  Python < 3.14.
+
+Key findings surfaced to the user:
+- `pyproject.toml:12` currently pins `<3.14`; PEP 734
+  `concurrent.interpreters` only ships in 3.14 — the
+  load-bearing constraint.
+- `_testing/pytest.py:345-349` hardcodes valid backends
+  as a string tuple (`'mp_spawn'`, `'mp_forkserver'`,
+  `'trio'`) — should be `get_args(SpawnMethodKey)`.
+- `_testing/pytest.py:228` already imports
+  `try_set_start_method` from `tractor.spawn._spawn` —
+  keeping the `_spawn.py` path as the "core" module
+  avoids breaking external refs during Phase A.
+
+Phase A commit breakdown (each green via `/run-tests`):
+1. Drive `_testing/pytest.py` backend-tuple from
+   `get_args(SpawnMethodKey)` — prep.
+2. Extract `trio_proc` → `spawn/_trio.py`; `_methods`
+   registry imports it.
+3. Extract `mp_proc` → `spawn/_mp.py`; `_methods` imports
+   it.
+4. Tidy `spawn/__init__.py` docstring for the new layout.
+
+Workflow: Phase A runs in a new worktree via `/open-wkt
+spawn_modularize` (branch `wkt/spawn_modularize`) and
+lands as its own PR before Phase B/C returns to the
+current `claude_bun_opus4.7_subint_spawner_backend`
+branch.
+
+## Files changed
+
+None this turn — design/planning only. The user updated
+`ai/prompt-io/prompts/subints_spawner.md` themselves to
+complete the truncated sentence on line 32 (harness-flag
+reference).
+
+Upcoming (Phase A, next turn):
+- `tractor/spawn/_spawn.py` — trimmed to "core"
+- `tractor/spawn/_trio.py` — new; holds `trio_proc()`
+- `tractor/spawn/_mp.py` — new; holds `mp_proc()`
+- `tractor/spawn/__init__.py` — docstring refresh
+- `tractor/_testing/pytest.py` — backend tuple from
+  `get_args(SpawnMethodKey)`
+
+## Human edits
+
+None — committed as generated. User completed the
+truncated sentence on line 32 of
+`ai/prompt-io/prompts/subints_spawner.md` themselves
+*before* this prompt-io log was written; that edit was
+the user's authoring, not an edit to AI output.

ai/prompt-io/claude/20260417T034918Z_9703210_prompt_io.raw.md

@@ -0,0 +1,117 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-04-17T03:49:18Z
+git_ref: 9703210
+diff_cmd: git diff HEAD~1..HEAD
+---
+
+No code was produced in this turn — this is a design/planning
+exchange for subint spawner support per issue #379. Captured
+verbatim below are the two substantive AI responses, which
+together fix the phased plan (A: modularize, B: subint, C:
+harness) and the concrete Phase A file split before any
+implementation begins.
+
+## Turn 1 — initial triage + gating questions
+
+> Read: issue #379, current `spawn/_spawn.py` (847 lines),
+> and pyproject pins.
+>
+> ## Task summary
+> Design/plan/implement subint backend per #379, plus
+> modularize `spawn/_spawn.py` into per-backend submods, plus
+> harness flag for test parametrization.
+>
+> ## Key finding
+> `pyproject.toml:12` pins `requires-python = ">=3.12, <3.14"`
+> — but `concurrent.interpreters` / PEP 734 **only lands in
+> 3.14**. This is the load-bearing design question before
+> coding.
+>
+> ## Proposed phasing (incremental commits)
+> - **Phase A — modularize** `_spawn.py`: extract `trio_proc`
+>   → `spawn/_trio.py`, `mp_proc` → `spawn/_mp.py`, keep
+>   generic helpers (`hard_kill`/`soft_kill`/`new_proc`
+>   dispatcher/`SpawnMethodKey`) in a slim core. Tests green
+>   at each step.
+> - **Phase B — `_subint` backend**: extend `SpawnMethodKey`
+>   with `'subint'`; reuse UDS transport by default; shm is
+>   escape-hatch follow-up.
+> - **Phase C — harness**: add backend-parametrize flag, skip
+>   subint when Python < 3.14.
+>
+> ## Gating questions before I start
+> 1. **Python pin**: bump `<3.15` and feature-gate subint
+>    tests (a), require 3.14 outright (b), or backport shim
+>    (c)? I'd recommend (a).
+> 2. **PR strategy**: one branch, commits per phase (current
+>    `claude_bun_opus4.7_subint_spawner_backend`)? Or split
+>    Phase A as its own PR first?
+> 3. **`fork()`-via-subint hack** from the issue's "Our own
+>    thoughts" section — v1 or follow-up? I'd defer to
+>    follow-up.
+> 4. **Prompt file line 32 is truncated** — what's the
+>    existing harness flag name you had in mind ("using the
+>    existing ___")?
+>
+> Which of these are already decided vs. open?
+
+## User answers (for the raw record)
+
+1. bump `<3.15`, feature-gate — option (a).
+2. split Phase A as its own PR first.
+3. defer `fork()`-via-subint hack.
+4. harness flag is `--spawn-backend` CLI → `start_method`
+   fixture, per `tractor._testing._pytest`. Prompt file
+   updated accordingly.
+
+## Turn 2 — concrete Phase A plan
+
+> Good — prompt file now ends cleanly; harness flag
+> confirmed as `--spawn-backend` CLI → `start_method`
+> fixture (via `_testing/pytest.py:193,355`). Also noted
+> `pytest.py:345-349` hardcodes valid backends as a string
+> tuple — `typing.get_args(SpawnMethodKey)` should drive
+> that list.
+>
+> ## Phase A — concrete plan (separate PR)
+>
+> **File split** in `tractor/spawn/`:
+> - `_spawn.py` stays as "core": keeps `SpawnMethodKey`,
+>   `_spawn_method`, `proc_waiter`, `try_set_start_method`,
+>   `exhaust_portal`, `cancel_on_completion`, `hard_kill`,
+>   `soft_kill`, `new_proc` dispatcher, `_methods`
+>   registry. Kept at this path so `_testing/pytest.py:228`
+>   and other external imports don't break.
+> - `_trio.py` ← `trio_proc()` (lines 448–671, ~224 lines)
+> - `_mp.py` ← `mp_proc()` (lines 672–842, ~171 lines)
+> - `_methods` dict imports the two backend fns from the
+>   new modules.
+>
+> **Commits** (each green via `/run-tests`):
+> 1. Drive `_testing/pytest.py` backend-tuple from
+>    `get_args(SpawnMethodKey)` — tiny prep.
+> 2. Extract `trio_proc` → `spawn/_trio.py`; `_methods`
+>    imports it.
+> 3. Extract `mp_proc` → `spawn/_mp.py`; `_methods`
+>    imports it.
+> 4. Tidy `spawn/__init__.py` docstring to describe new
+>    layout.
+>
+> No pyproject pin bump in Phase A (that's Phase B).
+>
+> **Workflow**: I'd run this in a new worktree via
+> `/open-wkt spawn_modularize` (branch
+> `wkt/spawn_modularize`), then open a PR before returning
+> to the current `claude_bun_opus4.7_subint_spawner_backend`
+> branch for Phase B/C.
+>
+> Green-light to `/open-wkt` and start Phase A?
+
+## User final response
+
+> all this first then yes, green light.
+
+— log this `/prompt-io` entry first, then proceed with
+Phase A in a worktree.

ai/prompt-io/claude/20260417T035800Z_61a73ba_prompt_io.md

@@ -0,0 +1,86 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: subints-spawner-phase-a-impl
+timestamp: 2026-04-17T03:58:05Z
+git_ref: 61a73ba
+scope: code
+substantive: true
+raw_file: 20260417T035800Z_61a73ba_prompt_io.raw.md
+---
+
+## Prompt
+
+Follow-up from the design session logged in
+`20260417T034918Z_9703210_prompt_io.md`: the user
+greenlit Phase A after `/prompt-io` tracking, so
+execute the Phase A "modularize `spawn._spawn`" plan
+end-to-end in a new worktree — four logical steps
+(pytest harness prep, `trio_proc` extraction,
+`mp_proc` extraction, docstring refresh), each green
+via `/run-tests`.
+
+User directives during execution:
+- **Option 3** for the test cadence ("continue A.2–A.4
+  first, then run the full suite once at the end of
+  Phase A").
+- **One commit** for the whole phase ("can't we just
+  commit the whole patch in one commit?") instead of
+  the 3/4-commit split I initially proposed.
+- **Don't pre-draft** commit messages — wait for the
+  user to invoke `/commit-msg` (captured as feedback
+  memory `feedback_no_auto_draft_commit_msgs.md`).
+
+## Response summary
+
+Produced the cohesive Phase A modularization patch,
+landed as commit `61a73bae` (subject: `Mv
+trio_proc`/`mp_proc` to per-backend submods`). Five
+files changed, +565 / -418 lines.
+
+Key pieces of the patch (generated by claude,
+reviewed by the human before commit):
+- `tractor/spawn/_trio.py` — **new**; receives
+  `trio_proc()` verbatim from `_spawn.py`; imports
+  cross-backend helpers back from `._spawn`.
+- `tractor/spawn/_mp.py` — **new**; receives
+  `mp_proc()` verbatim; uses `from . import _spawn`
+  for late-binding access to the mutable `_ctx` /
+  `_spawn_method` globals (design decision made
+  during impl, not the original plan).
+- `tractor/spawn/_spawn.py` — shrunk 847 → 448 LOC;
+  import pruning; bottom-of-module late imports for
+  `trio_proc` / `mp_proc` with a one-line comment
+  explaining the circular-dep reason.
+- `tractor/spawn/__init__.py` — docstring refresh
+  describing the new layout.
+- `tractor/_testing/pytest.py` — the valid-backend
+  set now comes from `typing.get_args(SpawnMethodKey)`
+  so future additions (`'subint'`) don't need harness
+  edits.
+
+## Files changed
+
+See `git diff 61a73ba~1..61a73ba --stat`:
+
+```
+ tractor/_testing/pytest.py |  12 +-
+ tractor/spawn/__init__.py  |  31 +++-
+ tractor/spawn/_mp.py       | 235 ++++++++++++++++++++++++
+ tractor/spawn/_spawn.py    | 413 +-------------------------------
+ tractor/spawn/_trio.py     | 292 ++++++++++++++++++++++++++++
+ 5 files changed, 565 insertions(+), 418 deletions(-)
+```
+
+Validation:
+- import probe + `_methods` wiring check — OK
+- spawn-relevant test subset — 37 passed, 1 skipped
+- full suite — 350 passed, 14 skipped, 7 xfailed, 1
+  xpassed
+
+## Human edits
+
+None — committed as generated by claude (no diff
+between `.claude/git_commit_msg_LATEST.md` and the
+committed body, as far as the assistant could
+observe).

ai/prompt-io/claude/20260417T035800Z_61a73ba_prompt_io.raw.md

@@ -0,0 +1,138 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-04-17T03:58:05Z
+git_ref: 61a73ba
+diff_cmd: git diff 61a73ba~1..61a73ba
+---
+
+Code generated in this turn was committed verbatim as
+`61a73bae` ("Mv `trio_proc`/`mp_proc` to per-backend
+submods"). Per diff-ref mode, per-file code is captured
+via the pointers below, each followed by a prose
+summary of what the AI generated. Non-code output
+(sanity-check results, design rationale) is included
+verbatim.
+
+## Per-file generated content
+
+### `tractor/spawn/_trio.py` (new, 292 lines)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/spawn/_trio.py`
+
+Pure lift-and-shift of `trio_proc()` out of
+`tractor/spawn/_spawn.py` (previously lines 448–670).
+Added AGPL header + module docstring describing the
+backend; imports include local `from ._spawn import
+cancel_on_completion, hard_kill, soft_kill` which
+creates the bottom-of-module late-import pattern in
+the core file to avoid a cycle. All call sites,
+log-format strings, and body logic are byte-identical
+to the originals — no semantic change.
+
+### `tractor/spawn/_mp.py` (new, 235 lines)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/spawn/_mp.py`
+
+Pure lift-and-shift of `mp_proc()` out of
+`tractor/spawn/_spawn.py` (previously lines 672–842).
+Same AGPL header convention. Key difference from
+`_trio.py`: uses `from . import _spawn` (module
+import, not from-import) for `_ctx` and
+`_spawn_method` references — these are mutated at
+runtime by `try_set_start_method()`, so late binding
+via `_spawn._ctx` / `_spawn._spawn_method` is required
+for correctness. Also imports `cancel_on_completion`,
+`soft_kill`, `proc_waiter` from `._spawn`.
+
+### `tractor/spawn/_spawn.py` (modified, 847 → 448 LOC)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/spawn/_spawn.py`
+
+- removed `trio_proc()` body (moved to `_trio.py`)
+- removed `mp_proc()` body (moved to `_mp.py`)
+- pruned imports now unused in core: `sys`,
+  `is_root_process`, `current_actor`,
+  `is_main_process`, `_mp_main`, `ActorFailure`,
+  `pretty_struct`, `_pformat`
+- added bottom-of-file late imports
+  `from ._trio import trio_proc` and
+  `from ._mp import mp_proc` with a one-line
+  comment explaining why (circular dep)
+- `_methods` dict unchanged structurally; still binds
+  `'trio' → trio_proc`, `'mp_spawn' → mp_proc`,
+  `'mp_forkserver' → mp_proc`
+
+### `tractor/spawn/__init__.py` (modified)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/spawn/__init__.py`
+
+Docstring rewrite only — no code. New text describes
+the per-backend `Layout` with `- ._spawn` (core),
+`- ._trio` (default), `- ._mp` (two mp variants), and
+reiterates the "no eager import" NOTE.
+
+### `tractor/_testing/pytest.py` (modified)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/_testing/pytest.py`
+
+Two-line logical change (plus a comment):
+- `from typing import` grows `get_args`
+- `pytest_generate_tests()` replaces the hardcoded
+  `('mp_spawn','mp_forkserver','trio')` tuple with
+  `get_args(SpawnMethodKey)` via lazy import
+  `from tractor.spawn._spawn import SpawnMethodKey`
+  inside the function body (matching the project's
+  existing lazy-import convention for the spawn
+  module)
+
+## Non-code output (verbatim)
+
+### Design rationale for the file split
+
+From my Phase A plan turn (already captured in
+`20260417T034918Z_9703210_prompt_io.md`):
+- `_spawn.py` stays as the "core" rather than renamed
+  to `_core.py` so external imports
+  (`_testing/pytest.py:228` imports
+  `try_set_start_method` from `tractor.spawn._spawn`)
+  keep working without churn.
+- Per-backend extraction chosen over alternatives
+  (e.g. splitting generic helpers further) because
+  the immediate motivation is hosting a 3rd
+  `_subint.py` sibling cleanly in Phase B.
+
+### Sanity-check output (verbatim terminal excerpts)
+
+Post-extraction import probe:
+```
+extraction OK
+_methods: {'trio': 'tractor.spawn._trio.trio_proc',
+           'mp_spawn': 'tractor.spawn._mp.mp_proc',
+           'mp_forkserver': 'tractor.spawn._mp.mp_proc'}
+```
+
+Spawn-relevant test subset (`tests/test_local.py
+test_rpc.py test_spawning.py test_multi_program.py
+test_discovery.py`):
+```
+37 passed, 1 skipped, 14 warnings in 55.37s
+```
+
+Full suite:
+```
+350 passed, 14 skipped, 7 xfailed, 1 xpassed,
+151 warnings in 437.73s (0:07:17)
+```
+
+No regressions vs. `main`. One transient `-x`
+early-stop `ERROR` on
+`test_close_channel_explicit_remote_registrar[trio-True]`
+was flaky (passed solo, passed without `-x`), not
+caused by this refactor.
+
+### Commit message
+
+Also AI-drafted (via `/commit-msg`) — the 40-line
+message on commit `61a73bae` itself. Not reproduced
+here; see `git log -1 61a73bae`.

ai/prompt-io/claude/20260417T124437Z_5cd6df5_prompt_io.md

@@ -0,0 +1,97 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: subints-spawner-phase-b1-impl
+timestamp: 2026-04-17T12:44:37Z
+git_ref: 5cd6df5
+scope: code
+substantive: true
+raw_file: 20260417T124437Z_5cd6df5_prompt_io.raw.md
+---
+
+## Prompt
+
+Continuing the Phase B work from the design sessions
+logged in `20260417T034918Z_9703210_prompt_io.md` and
+the Phase A impl in `20260417T035800Z_61a73ba_...`.
+
+User direction at this step:
+- "ok now let's continue with the subints part of the
+  plan ya?" → kick off Phase B.
+- After I proposed a 4-sub-phase breakdown (B.1
+  scaffolding, B.2 min-viable spawn, B.3 lifecycle,
+  B.4 test enablement), user: "ok can we continue
+  with B" → approving the phasing and design
+  defaults (thread-per-subint, UDS default,
+  code-string bootstrap via `interp.exec()`).
+- User switched the worktree to
+  `subint_spawner_backend` (instead of opening a
+  fresh worktree as I'd proposed): "i already
+  switched branches in the wkt, you should work off
+  `subint_spawner_backend` now".
+
+Scope of this turn: **B.1 scaffolding only** —
+wire the `'subint'` name through the spawn-method
+registry + harness, add a feature-detected stub
+module, bump pyproject. No actual spawn flow.
+
+## Response summary
+
+Produced the Phase B.1 scaffolding patch, landed as
+commit `5cd6df58` (subject: `Add `'subint'` spawn
+backend scaffold (#379)`). Four files changed,
++124 / -2 lines.
+
+Key pieces (all generated by claude, reviewed by
+human before commit):
+- `tractor/spawn/_subint.py` — **new**; feature-
+  detects `concurrent.interpreters`; `subint_proc()`
+  stub raises `RuntimeError` on py<3.14 or
+  `NotImplementedError` with issue-#379 URL on
+  py≥3.14. Signature mirrors `trio_proc`/`mp_proc`
+  so B.2 can drop the impl in without touching
+  `_methods`.
+- `tractor/spawn/_spawn.py` — adds `'subint'` to
+  `SpawnMethodKey`, grows a `case 'subint'` arm in
+  `try_set_start_method()` with feature-gate, re-
+  imports `sys` for the gate-error msg, adds late
+  `from ._subint import subint_proc` import and
+  `_methods` entry.
+- `tractor/_testing/pytest.py` — converts the
+  gate-error into `pytest.UsageError` via a
+  `try/except` around `try_set_start_method()` so
+  `--spawn-backend=subint` on py<3.14 prints a
+  clean banner instead of a traceback.
+- `pyproject.toml` — pin `requires-python` `<3.14`
+  → `<3.15`, add `3.14` trove classifier.
+
+## Files changed
+
+See `git diff 5cd6df5~1..5cd6df5 --stat`:
+
+```
+ pyproject.toml             |   3 +-
+ tractor/_testing/pytest.py |   8 +++-
+ tractor/spawn/_spawn.py    |  15 ++++++
+ tractor/spawn/_subint.py   | 100 +++++++++++++++++++++++++
+ 4 files changed, 124 insertions(+), 2 deletions(-)
+```
+
+Validation on py3.13:
+- registry/gate probe — OK; `_has_subints = False`,
+  `subint_proc()` raises `RuntimeError` as expected.
+- `try_set_start_method('subint')` — raises cleanly.
+- `pytest --spawn-backend=subint` — exits with
+  `pytest.UsageError` banner.
+- Spawn-relevant test subset — 69 passed, 1 skipped.
+- Full suite on py3.13 deferred (scaffolding is
+  no-op on <3.14).
+- Full-suite on py3.14 pending user setting up the
+  venv.
+
+## Human edits
+
+None — committed as generated by claude. `uv.lock`
+was intentionally left unstaged by the user (pin-
+bump regenerated cp314 wheel entries but they were
+deferred to a follow-up).

ai/prompt-io/claude/20260417T124437Z_5cd6df5_prompt_io.raw.md

@@ -0,0 +1,168 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-04-17T12:44:37Z
+git_ref: 5cd6df5
+diff_cmd: git diff 5cd6df5~1..5cd6df5
+---
+
+Code generated in this turn was committed verbatim as
+`5cd6df58` ("Add `'subint'` spawn backend scaffold
+(#379)"). Per diff-ref mode, per-file code is captured
+via the pointers below, each followed by a prose
+summary. Non-code output (sanity-check results,
+design rationale) is included verbatim.
+
+## Per-file generated content
+
+### `tractor/spawn/_subint.py` (new, 100 lines)
+
+> `git diff 5cd6df5~1..5cd6df5 -- tractor/spawn/_subint.py`
+
+New scaffolding module for the PEP 734 subinterpreter
+backend. Contents:
+- AGPL header + module docstring (describes backend
+  intent, 3.14+ availability gate, and explicit
+  "SCAFFOLDING STUB" status pointing at issue #379).
+- Top-level `try/except ImportError` wrapping
+  `from concurrent import interpreters as
+  _interpreters` → sets module-global
+  `_has_subints: bool`. This lets the registry stay
+  introspectable on py<3.14 while spawn-time still
+  fails cleanly.
+- `subint_proc()` coroutine with signature matching
+  `trio_proc`/`mp_proc` exactly (same param names,
+  defaults, and `TaskStatus[Portal]` typing) —
+  intentional so Phase B.2 can drop the impl in
+  without touching `_methods` or changing call-site
+  binding.
+- Body raises `RuntimeError` on py<3.14 (with
+  `sys.version` printed) or `NotImplementedError`
+  with issue-#379 URL on py≥3.14.
+
+### `tractor/spawn/_spawn.py` (modified, +15 LOC)
+
+> `git diff 5cd6df5~1..5cd6df5 -- tractor/spawn/_spawn.py`
+
+- `import sys` re-added (pruned during Phase A, now
+  needed again for the py-version string in the
+  `'subint'` gate-error).
+- `SpawnMethodKey = Literal[...]` grows `'subint'` as
+  the 4th member, with inline comment `# py3.14+ via
+  `concurrent.interpreters` (PEP 734)`.
+- `try_set_start_method()` match-block grows a new
+  `case 'subint':` arm that imports
+  `from ._subint import _has_subints` lazily and
+  raises `RuntimeError` with a multi-line gate msg
+  if unavailable.
+- Bottom-of-module late-import section grows
+  `from ._subint import subint_proc` alongside the
+  existing `_trio` / `_mp` imports.
+- `_methods` dict grows `'subint': subint_proc`.
+
+### `tractor/_testing/pytest.py` (modified, +8 LOC)
+
+> `git diff 5cd6df5~1..5cd6df5 -- tractor/_testing/pytest.py`
+
+`pytest_configure()` wraps the
+`try_set_start_method(backend)` call in a
+`try/except RuntimeError` that re-raises as
+`pytest.UsageError(str(err))`. Rationale: the gate
+error on py<3.14 is legitimately a configuration
+problem, not a test failure, so pytest's UsageError
+path (exit code 4) gives a clean single-line banner
+instead of a traceback.
+
+### `pyproject.toml` (modified, +2 / -1)
+
+> `git diff 5cd6df5~1..5cd6df5 -- pyproject.toml`
+
+- `requires-python` pin relaxed `>=3.12, <3.14` →
+  `>=3.12, <3.15` to admit 3.14 as a valid target.
+- Added `"Programming Language :: Python :: 3.14"`
+  to the trove classifiers.
+
+## Non-code output (verbatim)
+
+### Design choices captured in the prior turn
+
+(Previously confirmed by the user on April 17 in this
+session — relevant excerpts captured here for
+provenance since they drove the shape of the impl):
+
+1. **Python pin**: `<3.15` + feature-gate the subint
+   backend at spawn time — user answered option (a)
+   from the design triage.
+2. **Deferred `fork()`-via-subint hack** from issue
+   #379's "Our own thoughts" section.
+3. **Phase B phasing**: user approved the B.1 / B.2 /
+   B.3 / B.4 breakdown — this commit is strictly B.1
+   (scaffolding only, no spawn-flow impl).
+4. **Option (B) worktree strategy**: new worktree
+   branched from `wkt/spawn_modularize`. *(Amended by
+   user at runtime: user switched the existing
+   `spawn_modularize` worktree to the
+   `subint_spawner_backend` branch instead.)*
+
+### Sanity-check output (verbatim terminal excerpts)
+
+Registry / feature-gate verification on py3.13:
+```
+SpawnMethodKey values: ('trio', 'mp_spawn',
+                       'mp_forkserver', 'subint')
+_methods keys: ['trio', 'mp_spawn',
+                'mp_forkserver', 'subint']
+_has_subints: False (py version: (3, 13) )
+[expected] RuntimeError: The 'subint' spawn backend
+requires Python 3.14+ (stdlib
+`concurrent.interpreters`, PEP 734).
+```
+
+`try_set_start_method('subint')` gate on py3.13:
+```
+[expected] RuntimeError: Spawn method 'subint'
+requires Python 3.14+ (stdlib
+`concurrent.interpreters`, PEP 734).
+```
+
+Pytest `--spawn-backend=subint` on py3.13 (the new
+UsageError wrapper kicking in):
+```
+ERROR: Spawn method 'subint' requires Python 3.14+
+(stdlib `concurrent.interpreters`, PEP 734).
+Current runtime: 3.13.11 (main, Dec  5 2025,
+16:06:33) [GCC 15.2.0]
+```
+
+Collection probe: `404 tests collected in 0.18s`
+(no import errors from the new module).
+
+Spawn-relevant test subset (`tests/test_local.py
+test_rpc.py test_spawning.py test_multi_program.py
+tests/discovery/`):
+```
+69 passed, 1 skipped, 10 warnings in 61.38s
+```
+
+Full suite was **not** run on py3.13 for this commit
+— the scaffolding is no-op on <3.14 and full-suite
+validation under py3.14 is pending that venv being
+set up by the user.
+
+### Commit message
+
+Also AI-drafted (via `/commit-msg`, with the prose
+rewrapped through `/home/goodboy/.claude/skills/pr-msg/
+scripts/rewrap.py --width 67`) — the 33-line message
+on commit `5cd6df58` itself. Not reproduced here; see
+`git log -1 5cd6df58`.
+
+### Known follow-ups flagged to user
+
+- **`uv.lock` deferred**: pin-bump regenerated cp314
+  wheel entries in `uv.lock`, but the user chose to
+  not stage `uv.lock` for this commit. Warned
+  explicitly.
+- **Phase B.2 needs py3.14 venv** — running the
+  actual subint impl requires it; user said they'd
+  set it up separately.

ai/prompt-io/claude/20260418T042526Z_26fb820_prompt_io.md

@@ -0,0 +1,117 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: subints-phase-b2-destroy-race-fix
+timestamp: 2026-04-18T04:25:26Z
+git_ref: 26fb820
+scope: code
+substantive: true
+raw_file: 20260418T042526Z_26fb820_prompt_io.raw.md
+---
+
+## Prompt
+
+Follow-up to Phase B.2 (`5cd6df58`) after the user
+observed intermittent mid-suite hangs when running
+the tractor test suite under `--spawn-backend=subint`
+on py3.14. The specific sequence of prompts over
+several turns:
+
+1. User pointed at the `test_context_stream_semantics.py`
+   suite as the first thing to make run clean under
+   `--spawn-backend=subint`.
+2. After a series of `timeout`-terminated runs that
+   gave no diagnostic info, user nudged me to stop
+   relying on `timeout` and get actual runtime
+   diagnostics ("the suite hangs indefinitely, so i
+   don't think this `timeout 30` is helping you at
+   all.."). Switched to
+   `faulthandler.dump_traceback_later(...)` and a
+   resource-tracker fixture to rule out leaks.
+3. Captured a stack pinning the hang on
+   `_interpreters.destroy(interp_id)` in the subint
+   teardown finally block.
+4. Proposed dedicated-OS-thread fix. User greenlit.
+5. Implemented + verified on-worktree; user needed
+   to be pointed at the *worktree*'s `./py313` venv
+   because bare `pytest` was picking up the main
+   repo's venv (running un-patched `_subint.py`) and
+   still hanging.
+
+Running theme over the whole exchange: this patch
+only closes the *destroy race*. The user and I also
+traced through the deeper cancellation story — SIGINT
+can't reach subints, legacy-mode shares the GIL,
+portal-cancel dies when the IPC channel is already
+broken — and agreed the next step is a bounded
+hard-kill in `subint_proc`'s teardown plus a
+dedicated cancellation test suite. Those land as
+separate commits.
+
+## Response summary
+
+Produced the `tractor/spawn/_subint.py` patch landed
+as commit `26fb8206` ("Fix subint destroy race via
+dedicated OS thread"). One file, +110/-84 LOC.
+
+Mechanism: swap `trio.to_thread.run_sync(_interpreters
+.exec, ...)` for a plain `threading.Thread(target=...
+, daemon=False)`. The trio thread cache recycles
+workers — so the OS thread that ran `_interpreters
+.exec()` remained alive in the cache holding a
+stale subint tstate, blocking
+`_interpreters.destroy()` in the finally indefinitely.
+A dedicated one-shot thread exits naturally after
+the sync target returns, releasing tstate and
+unblocking destroy.
+
+Coordination across the trio↔thread boundary:
+- `trio.lowlevel.current_trio_token()` captured at
+  `subint_proc` entry
+- driver thread signals `subint_exited.set()` back
+  to parent trio via `trio.from_thread.run_sync(...,
+  trio_token=token)` (synchronous from the thread's
+  POV; the call returns after trio has run `.set()`)
+- `trio.RunFinishedError` swallowed in that path for
+  the process-teardown case where parent trio already
+  exited
+- teardown `finally` off-loads the sync
+  `driver_thread.join()` via `to_thread.run_sync` (a
+  cache thread carries no subint tstate — safe)
+
+## Files changed
+
+See `git diff 26fb820~1..26fb820 --stat`:
+
+```
+ tractor/spawn/_subint.py | 194 +++++++++++++++++++------------
+ 1 file changed, 110 insertions(+), 84 deletions(-)
+```
+
+Validation:
+- `test_parent_cancels[chk_ctx_result_before_exit=True-
+  cancel_method=ctx-child_returns_early=False]`
+  (the specific test that was hanging for the user)
+  — passed in 1.06s.
+- Full `tests/test_context_stream_semantics.py` under
+  subint — 61 passed in 100.35s (clean-cache re-run:
+  100.82s).
+- Trio backend regression subset — 69 passed / 1
+  skipped / 89.19s — no regressions from this change.
+
+## Files changed
+
+Beyond the `_subint.py` patch, the raw log also
+records the cancellation-semantics research that
+spanned this conversation but did not ship as code
+in *this* commit. Preserving it inline under "Non-
+code output" because it directly informs the
+Phase B.3 hard-kill impl that will follow (and any
+upstream CPython bug reports we end up filing).
+
+## Human edits
+
+None — committed as generated. The commit message
+itself was also AI-drafted via `/commit-msg` and
+rewrapped via the project's `rewrap.py --width 67`
+tooling; user landed it without edits.

ai/prompt-io/claude/20260418T042526Z_26fb820_prompt_io.raw.md

@@ -0,0 +1,220 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-04-18T04:25:26Z
+git_ref: 26fb820
+diff_cmd: git diff 26fb820~1..26fb820
+---
+
+Code generated in this turn was committed as `26fb8206`
+("Fix subint destroy race via dedicated OS thread").
+Per diff-ref mode, per-file code is captured via the
+pointer below; the rest is verbatim non-code output
+— test-session diagnostics, CPython-internals
+reasoning, and the design synthesis that's worth
+keeping alongside the code since it informs the
+still-pending Phase B.3 hard-kill work.
+
+## Per-file generated content
+
+### `tractor/spawn/_subint.py` (modified, +110/-84 LOC)
+
+> `git diff 26fb820~1..26fb820 -- tractor/spawn/_subint.py`
+
+Rewrites the subint driver-thread strategy:
+- replaces `trio.to_thread.run_sync(_interpreters.exec, ...)`
+  with a plain `threading.Thread(target=_subint_target,
+  daemon=False)` so the OS thread truly exits after
+  `_interpreters.exec()` returns
+- captures a `trio.lowlevel.current_trio_token()` at
+  `subint_proc` entry; the driver thread signals
+  completion back via `trio.from_thread.run_sync(
+  subint_exited.set, trio_token=...)`
+- swallows `trio.RunFinishedError` in the signal path
+  for the case where the parent trio loop has already
+  exited (process teardown)
+- in the teardown `finally` off-loads the sync
+  `driver_thread.join()` call to `trio.to_thread.run_sync`
+  (a cache thread w/ no subint tstate — so no cache
+  conflict) to wait for the driver thread to fully
+  exit before calling `_interpreters.destroy()`
+
+## Non-code output (verbatim) — the CPython-internals research
+
+### What went wrong before this commit
+
+Under `--spawn-backend=subint` on py3.14, most single
+tests passed but longer runs hung intermittently. The
+position of the hang moved between runs (test #22 on
+one run, test #53 on another) suggesting a timing-
+dependent race rather than a deterministic bug.
+
+`faulthandler.dump_traceback_later()` eventually
+caught a stack with the main thread blocked in
+`_interpreters.destroy(interp_id)` at `_subint.py:293`.
+Only 2 threads were alive:
+- main thread waiting in `_interpreters.destroy()`
+- one idle trio thread-cache worker in
+  `trio._core._thread_cache._work`
+
+No subint was still running (`_interpreters.list_all()`
+showed only the main interp). A resource-tracker
+pytest fixture confirmed threads/subints did NOT
+accumulate across tests — this was not a leak but a
+specific "destroy blocks on cached thread w/ stale
+tstate" race.
+
+### Why the race exists
+
+`trio.to_thread.run_sync` uses a thread *cache* to
+avoid OS-thread creation overhead. When the sync
+callable returns, the OS thread is NOT terminated —
+it's parked in `_thread_cache._work` waiting for the
+next job. CPython's subinterpreter implementation
+attaches a **tstate** (thread-state object) to each
+OS thread that ever entered a subint via
+`_interpreters.exec()`. That tstate is released
+lazily — either when the thread picks up a new job
+(which re-attaches a new tstate, evicting the old
+one) or when the thread truly exits.
+
+`_interpreters.destroy(interp_id)` waits for *all*
+tstates associated w/ that subint to be released
+before it can proceed. If the cached worker is idle
+holding the stale tstate, destroy blocks indefinitely.
+Whether the race manifests depends on timing — if
+the cached thread happens to pick up another job
+quickly, destroy unblocks; if it sits idle, we hang.
+
+### Why a dedicated `threading.Thread` fixes it
+
+A plain `threading.Thread(target=_subint_target,
+daemon=False)` runs its target once and exits. When
+the target returns, OS-thread teardown (`_bootstrap_inner`
+→ `_bootstrap`) fires and CPython releases the
+tstate for that thread. `_interpreters.destroy()`
+then has no blocker.
+
+### Diagnostic tactics that actually helped
+
+1. `faulthandler.dump_traceback_later(n, repeat=False,
+   file=open(path, 'w'))` for captured stack dumps on
+   hang. Critically, pipe to a `file=` not stderr —
+   pytest captures stderr weirdly and the dump is
+   easy to miss.
+2. A resource-tracker autouse fixture printing
+   per-test `threading.active_count()` +
+   `len(_interpreters.list_all())` deltas → ruled out
+   leak-accumulation theories quickly.
+3. Running the hanging test *solo* vs in-suite —
+   when solo passes but in-suite hangs, you know
+   it's a cross-test state-transfer bug rather than
+   a test-internal bug.
+
+### Design synthesis — SIGINT + subints + SC
+
+The user and I walked through the cancellation
+semantics of PEP 684/734 subinterpreters in detail.
+Key findings we want to preserve:
+
+**Signal delivery in subints (stdlib limitation).**
+CPython's signal machinery only delivers signals
+(SIGINT included) to the *main thread of the main
+interpreter*. Subints cannot install signal handlers
+that will ever fire. This is an intentional design
+choice in PEP 684 and not expected to change. For
+tractor's subint actors, this means:
+
+- Ctrl-C never reaches a subint directly.
+- `trio.run()` running on a worker thread (as we do
+  for subints) already skips SIGINT handler install
+  because `signal.signal()` raises on non-main
+  threads.
+- The only cancellation surface into a subint is
+  our IPC `Portal.cancel_actor()`.
+
+**Legacy-mode subints share the main GIL** (which
+our impl uses since `msgspec` lacks PEP 684 support
+per `jcrist/msgspec#563`). This means a stuck subint
+thread can starve the parent's trio loop during
+cancellation — the parent can't even *start* its
+teardown handling until the subint yields the GIL.
+
+**Failure modes identified for Phase B.3 audit:**
+
+1. Portal cancel lands cleanly → subint unwinds →
+   thread exits → destroy succeeds. (Happy path.)
+2. IPC channel is already broken when we try to
+   send cancel (e.g., `test_ipc_channel_break_*`)
+   → cancel raises `BrokenResourceError` → subint
+   keeps running unaware → parent hangs waiting for
+   `subint_exited`. This is what breaks
+   `test_advanced_faults.py` under subint.
+3. Subint is stuck in non-checkpointing Python code
+   → portal-cancel msg queued but never processed.
+4. Subint is in a shielded cancel scope when cancel
+   arrives → delay until shield exits.
+
+**Current teardown has a shield-bug too:**
+`trio.CancelScope(shield=True)` wrapping the `finally`
+block absorbs Ctrl-C, so even when the user tries
+to break out they can't. This is the reason
+`test_ipc_channel_break_during_stream[break_parent-...
+no_msgstream_aclose]` locks up unkillable.
+
+**B.3 hard-kill fix plan (next commit):**
+
+1. Bound `driver_thread.join()` with
+   `trio.move_on_after(HARD_KILL_TIMEOUT)`.
+2. If it times out, log a warning naming the
+   `interp_id` and switch the driver thread to
+   `daemon=True` mode (not actually possible after
+   start — so instead create as daemon=True upfront
+   and accept the tradeoff of proc-exit not waiting
+   for a stuck subint).
+3. Best-effort `_interpreters.destroy()`; catch the
+   `InterpreterError` if the subint is still running.
+4. Document that the leak is real and the only
+   escape hatch we have without upstream cooperation.
+
+**Test plan for Phase B.3:**
+
+New `tests/test_subint_cancellation.py` covering:
+- SIGINT at spawn
+- SIGINT mid-portal-RPC
+- SIGINT during shielded section in subint
+- Dead-channel cancel (mirror of `test_ipc_channel_
+  break_during_stream` minimized)
+- Non-checkpointing subint (tight `while True` in
+  user code)
+- Per-test `pytest-timeout`-style bounds so the
+  tests visibly fail instead of wedging the runner
+
+### Sanity-check output (verbatim terminal excerpts)
+
+Post-fix single-test validation:
+```
+1 passed, 1 warning in 1.06s
+```
+(same test that was hanging pre-fix:
+`test_parent_cancels[...cancel_method=ctx-...False]`)
+
+Full `tests/test_context_stream_semantics.py`
+under subint:
+```
+61 passed, 1 warning in 100.35s (0:01:40)
+```
+and a clean-cache re-run:
+```
+61 passed, 1 warning in 100.82s (0:01:40)
+```
+
+No regressions on trio backend (same subset):
+```
+69 passed, 1 skipped, 3 warnings in 89.19s
+```
+
+### Commit msg
+
+Also AI-drafted via `/commit-msg` + `rewrap.py
+--width 67`. See `git log -1 26fb820`.

ai/prompt-io/claude/20260420T192739Z_5e8cd8b2_prompt_io.md

@@ -0,0 +1,111 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: subint-phase-b-hang-classification
+timestamp: 2026-04-20T19:27:39Z
+git_ref: HEAD (pre-commit; on branch `subint_spawner_backend`)
+scope: docs
+substantive: true
+raw_file: 20260420T192739Z_5e8cd8b2_prompt_io.raw.md
+---
+
+## Prompt
+
+Collab between user (`goodboy`) and `claude` to
+disambiguate two distinct hang modes hit during
+Phase B subint-spawn-backend bringup (issue #379).
+The user ran the failing suites, captured `strace`
+evidence on hung pytest pids, and set the framing:
+
+> "These cannot be the same bug. Different fix
+> paths. Write them up separately or we'll keep
+> conflating them."
+
+Follow-on asks:
+- Cross-link each doc from its reproducer test so
+  a future triager lands on the analysis without
+  needing to grep `ai/conc-anal/`.
+- On `test_stale_entry_is_deleted`: arm
+  `dump_on_hang(seconds=20, path=...)` so a
+  regression captures a stack dump (pytest stderr
+  capture otherwise eats `faulthandler` output).
+- Keep `test_stale_entry_is_deleted` un-`skip`ped
+  so the dump file remains inspectable.
+
+Defer the actual fix for the class-2 hang
+(Ctrl-C-able, tractor-side bug) to a later commit
+per the incremental-commits preference.
+
+## Response summary
+
+Wrote two new `ai/conc-anal/` classification docs
+and cross-linked them from the reproducer tests:
+
+1. **`subint_sigint_starvation_issue.md`** —
+   class 1: abandoned-legacy-subint thread +
+   shared GIL starves main trio loop →
+   signal-wakeup-fd pipe fills → SIGINT silently
+   dropped (`write() = EAGAIN`). Pytest process
+   un-Ctrl-C-able. Structurally a CPython limit;
+   blocked on `msgspec` PEP 684 support
+   (jcrist/msgspec#563). Reproducer:
+   `test_stale_entry_is_deleted[subint]`.
+
+2. **`subint_cancel_delivery_hang_issue.md`** —
+   class 2: parent-side trio task parks on an
+   orphaned IPC channel after subint teardown;
+   no clean EOF delivered to waiting receiver.
+   Ctrl-C-able (main trio loop iterating fine).
+   OUR bug to fix. Candidate fix: explicit
+   parent-side channel abort in `subint_proc`'s
+   hard-kill teardown. Reproducer:
+   `test_subint_non_checkpointing_child`.
+
+Test-side cross-links:
+- `tests/discovery/test_registrar.py`:
+  `test_stale_entry_is_deleted` → `trio.run(main)`
+  wrapped in `dump_on_hang(seconds=20,
+  path=<per-method-tmp>)`; long inline comment
+  summarizes `strace` evidence + root-cause chain
+  and points at both docs.
+- `tests/test_subint_cancellation.py`:
+  `test_subint_non_checkpointing_child` docstring
+  extended with "KNOWN ISSUE (Ctrl-C-able hang)"
+  section pointing at the class-2 doc + noting
+  the class-1 doc is NOT what this test hits.
+
+## Files changed
+
+- `ai/conc-anal/subint_sigint_starvation_issue.md`
+  — new, 205 LOC
+- `ai/conc-anal/subint_cancel_delivery_hang_issue.md`
+  — new, 161 LOC
+- `tests/discovery/test_registrar.py` — +52/-1
+  (arm `dump_on_hang`, inline-comment cross-link)
+- `tests/test_subint_cancellation.py` — +26
+  (docstring "KNOWN ISSUE" block)
+
+## Human edits
+
+Substantive collab — prose was jointly iterated:
+
+- User framed the two-doc split, set the
+  classification criteria (Ctrl-C-able vs not),
+  and provided the `strace` evidence.
+- User decided to keep `test_stale_entry_is_deleted`
+  un-`skip`ped (my initial suggestion was
+  `pytestmark.skipif(spawn_backend=='subint')`).
+- User chose the candidate fix ordering for
+  class 2 and marked "explicit parent-side channel
+  abort" as the surgical preferred fix.
+- User picked the file naming convention
+  (`subint_<hang-shape>_issue.md`) over my initial
+  `hang_class_{1,2}.md`.
+- Assistant drafted the prose, aggregated prior-
+  session root-cause findings from Phase B.2/B.3
+  bringup, and wrote the test-side cross-linking
+  comments.
+
+No further mechanical edits expected before
+commit; user may still rewrap via
+`scripts/rewrap.py` if preferred.

ai/prompt-io/claude/20260420T192739Z_5e8cd8b2_prompt_io.raw.md

@@ -0,0 +1,198 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-04-20T19:27:39Z
+git_ref: HEAD (pre-commit; will land on branch `subint_spawner_backend`)
+diff_cmd: git diff HEAD~1..HEAD
+---
+
+Collab between `goodboy` (user) and `claude` (this
+assistant) spanning multiple test-run iterations on
+branch `subint_spawner_backend`. The user ran the
+failing suites, captured `strace` evidence on the
+hung pytest pids, and set the direction ("these are
+two different hangs — write them up separately so
+we don't re-confuse ourselves later"). The assistant
+aggregated prior-session findings (Phase B.2/B.3
+bringup) into two classification docs + test-side
+cross-links. All prose was jointly iterated; the
+user had final say on framing and decided which
+candidate fix directions to list.
+
+## Per-file generated content
+
+### `ai/conc-anal/subint_sigint_starvation_issue.md` (new, 205 LOC)
+
+> `git diff HEAD~1..HEAD -- ai/conc-anal/subint_sigint_starvation_issue.md`
+
+Writes up the "abandoned-legacy-subint thread wedges
+the parent trio loop" class. Key sections:
+
+- **Symptom** — `test_stale_entry_is_deleted[subint]`
+  hangs indefinitely AND is un-Ctrl-C-able.
+- **Evidence** — annotated `strace` excerpt showing
+  SIGINT delivered to pytest, C-level signal handler
+  tries to write to the signal-wakeup-fd pipe, gets
+  `write() = -1 EAGAIN (Resource temporarily
+  unavailable)`. Pipe is full because main trio loop
+  isn't iterating often enough to drain it.
+- **Root-cause chain** — our hard-kill abandons the
+  `daemon=True` driver OS thread after
+  `_HARD_KILL_TIMEOUT`; the subint *inside* that
+  thread is still running `trio.run()`;
+  `_interpreters.destroy()` cannot force-stop a
+  running subint (raises `InterpreterError`); legacy
+  subints share the main GIL → abandoned subint
+  starves main trio loop → wakeup-fd fills → SIGINT
+  silently dropped.
+- **Why it's structurally a CPython limit** — no
+  public force-destroy primitive for a running
+  subint; the only escape is per-interpreter GIL
+  isolation, gated on msgspec PEP 684 adoption
+  (jcrist/msgspec#563).
+- **Current escape hatch** — harness-side SIGINT
+  loop in the `daemon` fixture teardown that kills
+  the bg registrar subproc, eventually unblocking
+  a parent-side recv enough for the main loop to
+  drain the wakeup pipe.
+
+### `ai/conc-anal/subint_cancel_delivery_hang_issue.md` (new, 161 LOC)
+
+> `git diff HEAD~1..HEAD -- ai/conc-anal/subint_cancel_delivery_hang_issue.md`
+
+Writes up the *sibling* hang class — same subint
+backend, distinct root cause:
+
+- **TL;DR** — Ctrl-C-able, so NOT the SIGINT-
+  starvation class; main trio loop iterates fine;
+  ours to fix.
+- **Symptom** — `test_subint_non_checkpointing_child`
+  hangs past the expected `_HARD_KILL_TIMEOUT`
+  budget even after the subint is torn down.
+- **Diagnosis** — a parent-side trio task (likely
+  a `chan.recv()` in `process_messages`) parks on
+  an orphaned IPC channel; channel was torn down
+  without emitting a clean EOF /
+  `BrokenResourceError` to the waiting receiver.
+- **Candidate fix directions** — listed in rough
+  order of preference:
+  1. Explicit parent-side channel abort in
+     `subint_proc`'s hard-kill teardown (surgical;
+     most likely).
+  2. Audit `process_messages` to add a timeout or
+     cancel-scope protection that catches the
+     orphaned-recv state.
+  3. Wrap subint IPC channel construction in a
+     sentinel that can force-close from the parent
+     side regardless of subint liveness.
+
+### `tests/discovery/test_registrar.py` (modified, +52/-1 LOC)
+
+> `git diff HEAD~1..HEAD -- tests/discovery/test_registrar.py`
+
+Wraps the `trio.run(main)` call at the bottom of
+`test_stale_entry_is_deleted` in
+`dump_on_hang(seconds=20, path=<per-method-tmp>)`.
+Adds a long inline comment that:
+- Enumerates variant-by-variant status
+  (`[trio]`/`[mp_*]` = clean; `[subint]` = hangs
+  + un-Ctrl-C-able)
+- Summarizes the `strace` evidence and root-cause
+  chain inline (so a future reader hitting this
+  test doesn't need to cross-ref the doc to
+  understand the hang shape)
+- Points at
+  `ai/conc-anal/subint_sigint_starvation_issue.md`
+  for full analysis
+- Cross-links to the *sibling*
+  `subint_cancel_delivery_hang_issue.md` so
+  readers can tell the two classes apart
+- Explains why it's kept un-`skip`ped: the dump
+  file is useful if the hang ever returns after
+  a refactor. pytest stderr capture would
+  otherwise eat `faulthandler` output, hence the
+  file path.
+
+### `tests/test_subint_cancellation.py` (modified, +26 LOC)
+
+> `git diff HEAD~1..HEAD -- tests/test_subint_cancellation.py`
+
+Extends the docstring of
+`test_subint_non_checkpointing_child` with a
+"KNOWN ISSUE (Ctrl-C-able hang)" block:
+- Describes the current hang: parent-side orphaned
+  IPC recv after hard-kill; distinct from the
+  SIGINT-starvation sibling class.
+- Cites `strace` distinguishing signal: wakeup-fd
+  `write() = 1` (not `EAGAIN`) — i.e. main loop
+  iterating.
+- Points at
+  `ai/conc-anal/subint_cancel_delivery_hang_issue.md`
+  for full analysis + candidate fix directions.
+- Clarifies that the *other* sibling doc
+  (SIGINT-starvation) is NOT what this test hits.
+
+## Non-code output
+
+### Classification reasoning (why two docs, not one)
+
+The user and I converged on the two-doc split after
+running the suites and noticing two *qualitatively
+different* hang symptoms:
+
+1. `test_stale_entry_is_deleted[subint]` — pytest
+   process un-Ctrl-C-able. Ctrl-C at the terminal
+   does nothing. Must kill-9 from another shell.
+2. `test_subint_non_checkpointing_child` — pytest
+   process Ctrl-C-able. One Ctrl-C at the prompt
+   unblocks cleanly and the test reports a hang
+   via pytest-timeout.
+
+From the user: "These cannot be the same bug.
+Different fix paths. Write them up separately or
+we'll keep conflating them."
+
+`strace` on the `[subint]` hang gave the decisive
+signal for the first class:
+
+```
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(5, "\2", 1) = -1 EAGAIN (Resource temporarily unavailable)
+```
+
+fd 5 is Python's signal-wakeup-fd pipe. `EAGAIN`
+on a `write()` of 1 byte to a pipe means the pipe
+buffer is full → reader side (main Python thread
+inside `trio.run()`) isn't consuming. That's the
+GIL-hostage signature.
+
+The second class's `strace` showed `write(5, "\2",
+1) = 1` — clean drain — so the main trio loop was
+iterating and the hang had to be on the application
+side of things, not the kernel-↔-Python signal
+boundary.
+
+### Why the candidate fix for class 2 is "explicit parent-side channel abort"
+
+The second hang class has the trio loop alive. A
+parked `chan.recv()` that will never get bytes is
+fundamentally a tractor-side resource-lifetime bug
+— the IPC channel was torn down (subint destroyed)
+but no one explicitly raised
+`BrokenResourceError` at the parent-side receiver.
+The `subint_proc` hard-kill path is the natural
+place to add that notification, because it already
+knows the subint is unreachable at that point.
+
+Alternative fix paths (blanket timeouts on
+`process_messages`, sentinel-wrapped channels) are
+less surgical and risk masking unrelated bugs —
+hence the preference ordering in the doc.
+
+### Why we're not just patching the code now
+
+The user explicitly deferred the fix to a later
+commit: "Document both classes now, land the fix
+for class 2 separately so the diff reviews clean."
+This matches the incremental-commits preference
+from memory.

ai/prompt-io/claude/20260422T200723Z_797f57c_prompt_io.md

@@ -0,0 +1,155 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: subints-phase-b-hardening-and-fork-block
+timestamp: 2026-04-22T20:07:23Z
+git_ref: 797f57c
+scope: code
+substantive: true
+raw_file: 20260422T200723Z_797f57c_prompt_io.raw.md
+---
+
+## Prompt
+
+Session-spanning work on the Phase B `subint` spawn-backend.
+Three distinct sub-phases in one log:
+
+1. **Py3.13 gate tightening** — diagnose a reproducible hang
+   of subint spawn flow under py3.13 (works on py3.14), trace
+   to a private `_interpreters` module vintage issue, tighten
+   our feature gate from "`_interpreters` present" to "public
+   `concurrent.interpreters` present" (i.e. py3.14+).
+2. **Test-harness hardening** — add `pytest-timeout` dep, put
+   `@pytest.mark.timeout(30, method='thread')` on the
+   three known-hanging subint tests cataloged in
+   `ai/conc-anal/subint_sigint_starvation_issue.md`. Separately,
+   code-review the user's in-flight `skipon_spawn_backend`
+   marker implementation; find four bugs; refactor to use
+   `item.iter_markers()`.
+3. **`subint_fork` prototype → CPython-block finding** — draft
+   a WIP `subint_fork_proc` backend using a sub-interpreter as
+   a launchpad for `os.fork()` (to sidestep trio#1614). User
+   tests on py3.14, hits
+   `Fatal Python error: _PyInterpreterState_DeleteExceptMain:
+   not main interpreter`. Walk CPython sources (local clone at
+   `~/repos/cpython/`) to pinpoint the refusal
+   (`Modules/posixmodule.c:728` → `Python/pystate.c:1040`).
+   Revert implementation to a `NotImplementedError` stub in a
+   new `_subint_fork.py` submodule, document the finding in a
+   third `conc-anal/` doc with an upstream-report draft for
+   the CPython issue tracker. Finally, discuss user's proposed
+   workaround architecture (main-interp worker-thread
+   forkserver) and draft a standalone smoke-test script for
+   feasibility validation.
+
+## Response summary
+
+All three sub-phases landed concrete artifacts:
+
+**Sub-phase 1** — `_subint.py` + `_spawn.py` gates + error
+messages updated to require py3.14+ via the public
+`concurrent.interpreters` module presence check. Module
+docstring revised to explain the empirical reason
+(py3.13's private `_interpreters` vintage wedges under
+multi-trio-task usage even though minimal standalone
+reproducers work fine there). Test-module
+`pytest.importorskip` likewise switched.
+
+**Sub-phase 2** — `pytest-timeout>=2.3` added to `testing`
+dep group. `@pytest.mark.timeout(30, method='thread')`
+applied on:
+- `tests/discovery/test_registrar.py::test_stale_entry_is_deleted`
+- `tests/test_cancellation.py::test_cancel_while_childs_child_in_sync_sleep`
+- `tests/test_cancellation.py::test_multierror_fast_nursery`
+- `tests/test_subint_cancellation.py::test_subint_non_checkpointing_child`
+
+`method='thread'` documented inline as load-bearing — the
+GIL-starvation path that drops `SIGINT` would equally drop
+`SIGALRM`, so only a watchdog-thread timeout can reliably
+escape.
+
+`skipon_spawn_backend` plugin refactored into a single
+`iter_markers`-driven loop in `pytest_collection_modifyitems`
+(~30 LOC replacing ~30 LOC of nested conditionals). Four
+bugs dissolved: wrong `.get()` key, module-level `pytestmark`
+suppressing per-test marks, unhandled `pytestmark = [list]`
+form, `pytest.Makr` typo. Marker help text updated to
+document the variadic backend-list + `reason=` kwarg
+surface.
+
+**Sub-phase 3** — Prototype drafted (then reverted):
+
+- `tractor/spawn/_subint_fork.py` — new dedicated submodule
+  housing the `subint_fork_proc` stub. Module docstring +
+  fn docstring explain the attempt, the CPython-level
+  block, and the reason for keeping the stub in-tree
+  (documentation of the attempt + starting point if CPython
+  ever lifts the restriction).
+- `tractor/spawn/_spawn.py` — `'subint_fork'` registered as a
+  `SpawnMethodKey` literal + in `_methods`, so
+  `--spawn-backend=subint_fork` routes to a clean
+  `NotImplementedError` pointing at the analysis doc rather
+  than an "invalid backend" error.
+- `ai/conc-anal/subint_fork_blocked_by_cpython_post_fork_issue.md` —
+  third sibling conc-anal doc. Full annotated CPython
+  source walkthrough from user-visible
+  `Fatal Python error` → `Modules/posixmodule.c:728
+  PyOS_AfterFork_Child()` → `Python/pystate.c:1040
+  _PyInterpreterState_DeleteExceptMain()` gate. Includes a
+  copy-paste-ready upstream-report draft for the CPython
+  issue tracker with a two-tier ask (ideally "make it work",
+  minimally "cleaner error than `Fatal Python error`
+  aborting the child").
+- `ai/conc-anal/subint_fork_from_main_thread_smoketest.py` —
+  standalone zero-tractor-import CPython-level smoke test
+  for the user's proposed workaround architecture
+  (forkserver on a main-interp worker thread). Four
+  argparse-driven scenarios: `control_subint_thread_fork`
+  (reproduces the known-broken case as a test-harness
+  sanity),  `main_thread_fork` (baseline), `worker_thread_fork`
+  (architectural assertion), `full_architecture`
+  (end-to-end trio-in-subint in forked child). User will
+  run on py3.14 next.
+
+## Files changed
+
+See `git log 26fb820..HEAD --stat` for the canonical list.
+New files this session:
+- `tractor/spawn/_subint_fork.py`
+- `ai/conc-anal/subint_fork_blocked_by_cpython_post_fork_issue.md`
+- `ai/conc-anal/subint_fork_from_main_thread_smoketest.py`
+
+Modified (diff pointers in raw log):
+- `tractor/spawn/_subint.py` (py3.14 gate)
+- `tractor/spawn/_spawn.py` (`subint_fork` registration)
+- `tractor/_testing/pytest.py` (`skipon_spawn_backend` refactor)
+- `pyproject.toml` (`pytest-timeout` dep)
+- `tests/discovery/test_registrar.py`,
+  `tests/test_cancellation.py`,
+  `tests/test_subint_cancellation.py` (timeout marks,
+  cross-refs to conc-anal docs)
+
+## Human edits
+
+Several back-and-forth iterations with user-driven
+adjustments during the session:
+
+- User corrected my initial mis-classification of
+  `test_cancel_while_childs_child_in_sync_sleep[subint-False]`
+  as Ctrl-C-able — second strace showed `EAGAIN`, putting
+  it squarely in class A (GIL-starvation). Re-analysis
+  preserved in the raw log.
+- User independently fixed the `.get(reason)` → `.get('reason', reason)`
+  bug in the marker plugin before my review; preserved their
+  fix.
+- User suggested moving the `subint_fork_proc` stub from
+  the bottom of `_subint.py` into its own
+  `_subint_fork.py` submodule — applied.
+- User asked to keep the forkserver-architecture
+  discussion as background for the smoke-test rather than
+  committing to a tractor-side refactor until the smoke
+  test validates the CPython-level assumptions.
+
+Commit messages in this range (b025c982 … 797f57c) were
+drafted via `/commit-msg` + `rewrap.py --width 67`; user
+landed them with the usual review.

ai/prompt-io/claude/20260422T200723Z_797f57c_prompt_io.raw.md

@@ -0,0 +1,343 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-04-22T20:07:23Z
+git_ref: 797f57c
+diff_cmd: git log 26fb820..HEAD  # all session commits since the destroy-race fix log
+---
+
+Session-spanning conversation covering the Phase B hardening
+of the `subint` spawn-backend and an investigation into a
+proposed `subint_fork` follow-up which turned out to be
+blocked at the CPython level. This log is a narrative capture
+of the substantive turns (not every message) and references
+the concrete code + docs the session produced. Per diff-ref
+mode the actual code diffs are pointed at via `git log` on
+each ref rather than duplicated inline.
+
+## Narrative of the substantive turns
+
+### Py3.13 hang / gate tightening
+
+Diagnosed a reproducible hang of the `subint` backend under
+py3.13 (test_spawning tests wedge after root-actor bringup).
+Root cause: py3.13's vintage of the private `_interpreters` C
+module has a latent thread/subint-interaction issue that
+`_interpreters.exec()` silently fails to progress under
+tractor's multi-trio usage pattern — even though a minimal
+standalone `threading.Thread` + `_interpreters.exec()`
+reproducer works fine on the same Python. Empirically
+py3.14 fixes it.
+
+Fix (from this session): tighten the `_has_subints` gate in
+`tractor.spawn._subint` from "private module importable" to
+"public `concurrent.interpreters` present" — which is 3.14+
+only. This leaves `subint_proc()` unchanged in behavior (we
+still call the *private* `_interpreters.create('legacy')`
+etc. under the hood) but refuses to engage on 3.13.
+
+Also tightened the matching gate in
+`tractor.spawn._spawn.try_set_start_method('subint')` and
+rev'd the corresponding error messages from "3.13+" to
+"3.14+" with a sentence explaining why. Test-module
+`pytest.importorskip` switched from `_interpreters` →
+`concurrent.interpreters` to match.
+
+### `pytest-timeout` dep + `skipon_spawn_backend` marker plumbing
+
+Added `pytest-timeout>=2.3` to the `testing` dep group with
+an inline comment pointing at the `ai/conc-anal/*.md` docs.
+Applied `@pytest.mark.timeout(30, method='thread')` (the
+`method='thread'` is load-bearing — `signal`-method
+`SIGALRM` suffers the same GIL-starvation path that drops
+`SIGINT` in the class-A hang pattern) to the three known-
+hanging subint tests cataloged in
+`subint_sigint_starvation_issue.md`.
+
+Separately code-reviewed the user's newly-staged
+`skipon_spawn_backend` pytest marker implementation in
+`tractor/_testing/pytest.py`. Found four bugs:
+
+1. `modmark.kwargs.get(reason)` called `.get()` with the
+   *variable* `reason` as the dict key instead of the string
+   `'reason'` — user-supplied `reason=` was never picked up.
+   (User had already fixed this locally via `.get('reason',
+   reason)` by the time my review happened — preserved that
+   fix.)
+2. The module-level `pytestmark` branch suppressed per-test
+   marker handling (the `else:` was an `else:` rather than
+   independent iteration).
+3. `mod_pytestmark.mark` assumed a single
+   `MarkDecorator` — broke on the valid-pytest `pytestmark =
+   [mark, mark]` list form.
+4. Typo: `pytest.Makr` → `pytest.Mark`.
+
+Refactored the hook to use `item.iter_markers(name=...)`
+which walks function + class + module scopes uniformly and
+handles both `pytestmark` forms natively. ~30 LOC replaced
+the original ~30 LOC of nested conditionals, all four bugs
+dissolved. Also updated the marker help string to reflect
+the variadic `*start_methods` + `reason=` surface.
+
+### `subint_fork_proc` prototype attempt
+
+User's hypothesis: the known trio+`fork()` issues
+(python-trio/trio#1614) could be sidestepped by using a
+sub-interpreter purely as a launchpad — `os.fork()` from a
+subint that has never imported trio → child is in a
+trio-free context. In the child `execv()` back into
+`python -m tractor._child` and the downstream handshake
+matches `trio_proc()` identically.
+
+Drafted the prototype at `tractor/spawn/_subint.py`'s bottom
+(originally — later moved to its own submod, see below):
+launchpad-subint creation, bootstrap code-string with
+`os.fork()` + `execv()`, driver-thread orchestration,
+parent-side `ipc_server.wait_for_peer()` dance. Registered
+`'subint_fork'` as a new `SpawnMethodKey` literal, added
+`case 'subint' | 'subint_fork':` feature-gate arm in
+`try_set_start_method()`, added entry in `_methods` dict.
+
+### CPython-level block discovered
+
+User tested on py3.14 and saw:
+
+```
+Fatal Python error: _PyInterpreterState_DeleteExceptMain: not main interpreter
+Python runtime state: initialized
+
+Current thread 0x00007f6b71a456c0 [subint-fork-lau] (most recent call first):
+  File "<script>", line 2 in <module>
+<script>:2: DeprecationWarning: This process (pid=802985) is multi-threaded, use of fork() may lead to deadlocks in the child.
+```
+
+Walked CPython sources (local clone at `~/repos/cpython/`):
+
+- **`Modules/posixmodule.c:728` `PyOS_AfterFork_Child()`** —
+  post-fork child-side cleanup. Calls
+  `_PyInterpreterState_DeleteExceptMain(runtime)` with
+  `goto fatal_error` on non-zero status. Has the
+  `// Ideally we could guarantee tstate is running main.`
+  self-acknowledging-fragile comment directly above.
+
+- **`Python/pystate.c:1040`
+  `_PyInterpreterState_DeleteExceptMain()`** — the
+  refusal. Hard `PyStatus_ERR("not main interpreter")` gate
+  when `tstate->interp != interpreters->main`. Docstring
+  formally declares the precondition ("If there is a
+  current interpreter state, it *must* be the main
+  interpreter"). `XXX` comments acknowledge further latent
+  issues within.
+
+Definitive answer to "Open Question 1" of the prototype
+docstring: **no, CPython does not support `os.fork()` from
+a non-main sub-interpreter**. Not because the fork syscall
+is blocked (it isn't — the parent returns a valid pid),
+but because the child cannot survive CPython's post-fork
+initialization. This is an enforced invariant, not an
+incidental limitation.
+
+### Revert: move to stub submod + doc the finding
+
+Per user request:
+
+1. Reverted the working `subint_fork_proc` body to a
+   `NotImplementedError` stub, MOVED to its own submod
+   `tractor/spawn/_subint_fork.py` (keeps `_subint.py`
+   focused on the working `subint_proc` backend).
+2. Updated `_spawn.py` to import the stub from the new
+   submod path; kept `'subint_fork'` in `SpawnMethodKey` +
+   `_methods` so `--spawn-backend=subint_fork` routes to a
+   clean `NotImplementedError` with pointer to the analysis
+   doc rather than an "invalid backend" error.
+3. Wrote
+   `ai/conc-anal/subint_fork_blocked_by_cpython_post_fork_issue.md`
+   with the full annotated CPython walkthrough + an
+   upstream-report draft for the CPython issue tracker.
+   Draft has a two-tier ask: ideally "make it work"
+   (pre-fork tstate-swap hook or `DeleteExceptFor(interp)`
+   variant), minimally "give us a clean `RuntimeError` in
+   the parent instead of a `Fatal Python error` aborting
+   the child silently".
+
+### Design discussion — main-interp-thread forkserver workaround
+
+User proposed: set up a "subint forking server" that fork()s
+on behalf of subint callers. Core insight: the CPython gate
+is on `tstate->interp`, not thread identity, so **any thread
+whose tstate is main-interp** can fork cleanly. A worker
+thread attached to main-interp (never entering a subint)
+satisfies the precondition.
+
+Structurally this is `mp.forkserver` (which tractor already
+has as `mp_forkserver`) but **in-process**: instead of a
+separate Python subproc as the fork server, we'd put the
+forkserver on a thread in the tractor parent process. Pros:
+faster spawn (no IPC marshalling to external server + no
+separate Python startup), inherits already-imported modules
+for free. Cons: less crash isolation (forkserver failure
+takes the whole process).
+
+Required tractor-side refactor: move the root actor's
+`trio.run()` off main-interp-main-thread (so main-thread can
+run the forkserver loop). Nontrivial; approximately the same
+magnitude as "Phase C".
+
+The design would also not fully resolve the class-A
+GIL-starvation issue because child actors' trio still runs
+inside subints (legacy config, msgspec PEP 684 pending).
+Would mitigate SIGINT-starvation specifically if signal
+handling moves to the forkserver thread.
+
+Recommended pre-commitment: a standalone CPython-only smoke
+test validating the four assumptions the arch rests on,
+before any tractor-side work.
+
+### Smoke-test script drafted
+
+Wrote `ai/conc-anal/subint_fork_from_main_thread_smoketest.py`:
+argparse-driven, four scenarios (`control_subint_thread_fork`
+reproducing the known-broken case, `main_thread_fork`
+baseline, `worker_thread_fork` the architectural assertion,
+`full_architecture` end-to-end with trio in a subint in the
+forked child). No `tractor` imports; pure CPython + `_interpreters`
++ `trio`. Bails cleanly on py<3.14. Pass/fail banners per
+scenario.
+
+User will validate on their py3.14 env next.
+
+## Per-code-artifact provenance
+
+### `tractor/spawn/_subint_fork.py` (new submod)
+
+> `git show 797f57c -- tractor/spawn/_subint_fork.py`
+
+NotImplementedError stub for the subint-fork backend. Module
+docstring + fn docstring explain the attempt, the CPython
+block, and why the stub is kept in-tree. No runtime behavior
+beyond raising with a pointer at the conc-anal doc.
+
+### `tractor/spawn/_spawn.py` (modified)
+
+> `git log 26fb820..HEAD -- tractor/spawn/_spawn.py`
+
+- Added `'subint_fork'` to `SpawnMethodKey` literal with a
+  block comment explaining the CPython-level block.
+- Generalized the `case 'subint':` arm to `case 'subint' |
+  'subint_fork':` since both use the same py3.14+ gate.
+- Registered `subint_fork_proc` in `_methods` with a
+  pointer-comment at the analysis doc.
+
+### `tractor/spawn/_subint.py` (modified across session)
+
+> `git log 26fb820..HEAD -- tractor/spawn/_subint.py`
+
+- Tightened `_has_subints` gate: dual-requires public
+  `concurrent.interpreters` + private `_interpreters`
+  (tests for py3.14-or-newer on the public-API presence,
+  then uses the private one for legacy-config subints
+  because `msgspec` still blocks the public isolated mode
+  per jcrist/msgspec#563).
+- Updated module docstring, `subint_proc()` docstring, and
+  gate-error messages to reflect the 3.14+ requirement and
+  the reason (py3.13 wedges under multi-trio usage even
+  though the private module exists there).
+
+### `tractor/_testing/pytest.py` (modified)
+
+> `git log 26fb820..HEAD -- tractor/_testing/pytest.py`
+
+- New `skipon_spawn_backend(*start_methods, reason=...)`
+  pytest marker expanded into `pytest.mark.skip(reason=...)`
+  at collection time via
+  `pytest_collection_modifyitems()`.
+- Implementation uses `item.iter_markers(name=...)` which
+  walks function + class + module scopes uniformly and
+  handles both `pytestmark = <single Mark>` and
+  `pytestmark = [mark, ...]` forms natively. ~30-LOC
+  single-loop refactor replacing a prior nested
+  conditional that had four bugs (see "Review" narrative
+  above).
+- Added `pytest.Config` / `pytest.Function` /
+  `pytest.FixtureRequest` type annotations on fixture
+  signatures while touching the file.
+
+### `pyproject.toml` (modified)
+
+> `git log 26fb820..HEAD -- pyproject.toml`
+
+Added `pytest-timeout>=2.3` to `testing` dep group with
+comment pointing at the `ai/conc-anal/` docs.
+
+### `tests/discovery/test_registrar.py`,
+`tests/test_subint_cancellation.py`,
+`tests/test_cancellation.py` (modified)
+
+> `git log 26fb820..HEAD -- tests/`
+
+Applied `@pytest.mark.timeout(30, method='thread')` on
+known-hanging subint tests. Extended comments to cross-
+reference the `ai/conc-anal/*.md` docs. `method='thread'`
+is documented inline as load-bearing (`signal`-method
+SIGALRM suffers the same GIL-starvation path that drops
+SIGINT).
+
+### `ai/conc-anal/subint_fork_blocked_by_cpython_post_fork_issue.md` (new)
+
+> `git show 797f57c -- ai/conc-anal/subint_fork_blocked_by_cpython_post_fork_issue.md`
+
+Third sibling doc under `conc-anal/`. Structure: TL;DR,
+context ("what we tried"), symptom (the user's exact
+`Fatal Python error` output), CPython source walkthrough
+with excerpted snippets from `posixmodule.c` +
+`pystate.c`, chain summary, definitive answer to Open
+Question 1, `## Upstream-report draft (for CPython issue
+tracker)` section with a two-tier ask, references.
+
+### `ai/conc-anal/subint_fork_from_main_thread_smoketest.py` (new, THIS turn)
+
+Zero-tractor-import smoke test for the proposed workaround
+architecture. Four argparse-driven scenarios covering the
+control case + baseline + arch-critical case + end-to-end.
+Pass/fail banners per scenario; clean `--help` output;
+py3.13 early-exit.
+
+## Non-code output (verbatim)
+
+### The `strace` signature that kicked off the CPython
+walkthrough
+
+```
+--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
+write(16, "\2", 1)                      = -1 EAGAIN (Resource temporarily unavailable)
+rt_sigreturn({mask=[WINCH]})            = 139801964688928
+```
+
+### Key user quotes framing the direction
+
+> ok actually we get this [fatal error] ... see if you can
+> take a look at what's going on, in particular wrt to
+> cpython's sources. pretty sure there's a local copy at
+> ~/repos/cpython/
+
+(Drove the CPython walkthrough that produced the
+definitive refusal chain.)
+
+> is there any reason we can't just sidestep this "must fork
+> from main thread in main subint" issue by simply ensuring
+> a "subint forking server" is always setup prior to
+> invoking trio in a non-main-thread subint ...
+
+(Drove the main-interp-thread-forkserver architectural
+discussion + smoke-test script design.)
+
+### CPython source tags for quick jump-back
+
+```
+Modules/posixmodule.c:728   PyOS_AfterFork_Child()
+Modules/posixmodule.c:753   // Ideally we could guarantee tstate is running main.
+Modules/posixmodule.c:778   status = _PyInterpreterState_DeleteExceptMain(runtime);
+
+Python/pystate.c:1040       _PyInterpreterState_DeleteExceptMain()
+Python/pystate.c:1044-1047  tstate->interp != main → PyStatus_ERR("not main interpreter")
+```

ai/prompt-io/claude/20260601T231429Z_0e3e008b_prompt_io.md

@@ -0,0 +1,146 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: trio-0.33-subproc-supervisor-retroactive
+timestamp: 2026-06-01T23:14:29Z
+git_ref: 0e3e008b
+scope: code
+substantive: true
+raw_file: 20260601T231429Z_0e3e008b_prompt_io.raw.md
+---
+
+## Prompt
+
+**RETROACTIVE LOG** — original session prompts not
+preserved; reconstructed from the staged work product.
+
+The work designs a `trio.Nursery.start()`-style wrapper
+around `trio.run_process()` for SC-friendly subprocess
+supervision. From the resulting code shape, the
+prompting intent was:
+
+1. Surface rc!=0 `CalledProcessError` DETERMINISTICALLY,
+   without the nursery-eg-wrapping that complicates
+   `collapse_eg()` usage and races the relay reader on
+   trio's `check=True`-driven cancel cascade.
+2. ALWAYS isolate the parent controlling-tty so a
+   spawned child can't emit terminal control-seqs onto
+   the launching tty (clobbering scrollback). Default
+   `stdin=DEVNULL`; default `stdout=DEVNULL` unless
+   explicitly relayed/overridden; distinguish "caller
+   passed nothing" from "caller passed `None` for
+   inherit".
+3. Optional live per-line relay of child std-streams to
+   the `tractor` log — STREAMED (not
+   buffered-until-exit) so long-lived daemon output is
+   visible during the run. Pick a custom log level that
+   shows at usual `info`/`devx` console levels but is
+   separately filterable.
+4. Concurrent pipe-drain reader MANDATORY when piping
+   without `capture_*` — without it the child blocks on
+   `write()` once the OS pipe buffer fills (~64KiB),
+   causing deadlocks on output bursts.
+5. Non-blocking `tn.start()` semantics: hand the live
+   `trio.Process` to the parent immediately;
+   supervise/relay run to completion in the supervisor
+   coro.
+6. Hermetic `trio`-only unit tests (no actor-runtime)
+   covering each of: per-line relay, tty isolation,
+   no-deadlock on >64KiB unnewlined output, CPE
+   rebuild w/ stderr relay, CPE rebuild on the silent
+   drain+capture path.
+
+## Response summary
+
+Adds `tractor/trionics/_subproc.py` (296 LOC) +
+`tests/trionics/test_subproc.py` (230 LOC) + a
+re-export in `tractor/trionics/__init__.py`.
+
+**`supervise_run_process()`** (public, re-exported)
+- `check=False` is forced to `trio.run_process`; the
+  rc-check runs in the supervisor coro AFTER `own_tn`
+  unwinds (both the child AND the relay readers have
+  hit EOF + fully drained). A BARE
+  `subprocess.CalledProcessError` is rebuilt + raised
+  from there, with `.stderr` bytes passed in the
+  constructor AND attached as an `add_note()`'d
+  `|_.stderr:` block for legible teardown logs.
+- `stdin=DEVNULL` always. `stdout` default chosen via a
+  `_UNSET` sentinel: `relay_stdout=True` → PIPE,
+  explicit `stdout=...` → as given, else `DEVNULL`.
+  `stderr` defaults to PIPE whenever we relay OR need
+  the CPE note (when `check=True`), else `DEVNULL`.
+- `relay_level='io'` (custom level 21; sorts just
+  above stdlib `INFO`=20 so it shows at usual
+  `info`/`devx` levels and stays separately
+  filterable). `runtime`=15 would silently filter at
+  default levels, so it's rejected as a default.
+- `task_status.started(trio_proc)` delivers the live
+  process immediately. The internal `own_tn`
+  supervises `trio.run_process` + any relay readers to
+  completion.
+- `**run_process_kwargs` forward verbatim;
+  `stdin/stdout/stderr/check` are MANAGED keys
+  (override on conflict).
+- Crash-handling deliberately NOT baked in — compose
+  `maybe_open_crash_handler()` on top at the call-site.
+
+**`_relay_stream_lines()`** (internal helper)
+- Three modes (combinable): `emit`-only (live per-line
+  relay), `accum`-only (silent drain+capture for a CPE
+  note), or both (live relay AND capture).
+- Per-line split handles cross-chunk residuals via a
+  rolling `residual` bytes buffer; flushes any trailing
+  un-newline-term'd line at EOF.
+- `async with stream:` ensures aclose at EOF/cancel
+  (mirrors trio's internal `_subprocess` drain idiom).
+
+**`_add_stderr_note()`** (internal helper)
+- `add_note()`s a `textwrap.indent(...)`'d
+  `|_.stderr:` block onto a `CalledProcessError` for
+  teardown logs.
+
+**Tests** (5 hermetic, trio-only) — `_capture_relay`
+fixture monkeypatches `_subproc.log.<level>` to a list:
+- `test_stdout_relayed_per_line`: per-line stdout
+  relay carries each `line=N` to the records.
+- `test_parent_tty_isolated`: `readlink /proc/self/fd/0`
+  and `fd/1` from the child show `pipe:` (fd1) +
+  `/dev/null` (fd0); NO `/dev/pts/*`.
+- `test_no_deadlock_on_big_unnewlined_output`: 200KiB
+  of `x` with no newlines completes inside
+  `fail_after(2)` — exercises the concurrent drain.
+- `test_stderr_relay_and_cpe_rebuild`: rc=3 with
+  `relay_stderr=True` raises bare CPE
+  (via `collapse_eg()`) with `b'boom' in cpe.stderr`,
+  the note attached, AND per-line live relay.
+- `test_nonrelay_cpe_note`: rc=7 with no relay still
+  produces CPE with `.stderr` + note via the silent
+  drain+capture path.
+
+## Files changed
+
+- `tractor/trionics/_subproc.py` — NEW. Public
+  `supervise_run_process()` + helpers
+  `_relay_stream_lines()` / `_add_stderr_note()` + the
+  `_UNSET` sentinel.
+- `tests/trionics/test_subproc.py` — NEW. 5 hermetic
+  trio-only tests + `_capture_relay` monkeypatch
+  fixture.
+- `tractor/trionics/__init__.py` — re-export
+  `supervise_run_process`.
+
+## Human edits
+
+**RETROACTIVE**: this log is being written from the
+staged diff, not from a live session. The code as
+staged is the canonical artifact; any human edits the
+user made during the originating design session are
+already integrated and cannot be separated post-hoc.
+The `.raw.md` sibling is a diff-pointer placeholder,
+NOT a pre-edit transcript.
+
+Future prompt-io entries for in-flight work should be
+written DURING the design session per the skill
+contract so the pre-edit `.raw.md` captures the
+unedited model output for genuine provenance.

ai/prompt-io/claude/20260601T231429Z_0e3e008b_prompt_io.raw.md

@@ -0,0 +1,106 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-06-01T23:14:29Z
+git_ref: 0e3e008b
+diff_cmd: git diff HEAD~1..HEAD
+---
+
+# RETROACTIVE — original model output not preserved
+
+This `.raw.md` would normally contain the verbatim
+pre-human-edit response from the design session that
+produced the staged `_subproc.py` module + tests. That
+session's transcript is not available, so this file
+serves as a diff-pointer placeholder + transparency
+note.
+
+## Authoritative artifact
+
+The committed code IS the artifact of record. Once the
+companion commit lands, the unified diff is:
+
+> `git diff HEAD~1..HEAD -- tractor/trionics/_subproc.py`
+> `git diff HEAD~1..HEAD -- tests/trionics/test_subproc.py`
+> `git diff HEAD~1..HEAD -- tractor/trionics/__init__.py`
+
+Before committing, substitute `--cached` for the
+pre-commit form.
+
+## What is NOT here
+
+Because this is retroactive:
+- No verbatim chain-of-thought / discussion prose from
+  the design session.
+- No rejected alternatives the model considered before
+  arriving at the final shape (e.g. whether the
+  rc-check should live inside `own_tn` vs after it; the
+  `_UNSET` sentinel vs a `None`-means-DEVNULL
+  convention; `io` vs `info` as the default relay
+  level).
+- No pre-edit code blocks as the model first emitted
+  them, separable from any user cleanup applied before
+  the diff was staged.
+
+## Inferred design choices visible in the final code
+
+(Documented here because they're the kind of decision
+detail an unedited raw transcript would have captured.)
+
+1. **Post-drain rc-check in the supervisor coro body,
+   AFTER `own_tn.__aexit__`.** Placing the
+   `CalledProcessError` raise here (not inside
+   `own_tn`) means the EG-unwrap happens at the OUTER
+   `tn.start()` boundary — callers do `collapse_eg()`
+   if they want bare. Doing the raise INSIDE `own_tn`
+   would cancel the still-draining relay reader
+   mid-flight and lose stderr lines.
+
+2. **`_UNSET` sentinel for `stdout`.** A plain default
+   of `None` couldn't distinguish "use the safe
+   `DEVNULL` default" from "caller explicitly passed
+   `None` (inherit, presumably knowingly)". The
+   sentinel keeps the SAFE default while letting power
+   users opt into inherit.
+
+3. **`relay_level='io'` (custom level 21).** Chosen to
+   sort just above stdlib `INFO`=20 so a default
+   `--ll info` shows the relay, but it remains a
+   distinct level so users can filter
+   `tractor.trionics:io` separately. Picking
+   `runtime`=15 would have made the relay invisible at
+   default verbosity (a footgun for daemon supervisors
+   whose whole point is "I want to see this output").
+
+4. **Reader is MANDATORY, not opt-in cosmetic.** With
+   `stdout=PIPE` / `stderr=PIPE` we OWN the drain
+   responsibility — there's no `trio.capture_*` running
+   under the hood here. The ~64KiB OS pipe buffer
+   means a child writing more than that without us
+   reading hangs at `write()` — a deadlock that won't
+   show up in small-output tests, which is why the
+   200KiB-no-newline test is in the suite.
+
+5. **`task_status.started(trio_proc)` BEFORE the
+   `own_tn` exits.** Without this, `tn.start()` would
+   block until the child exits — losing the "start a
+   long-lived daemon and continue with parent work"
+   use case. With it, the parent gets the live process
+   handle immediately and the supervise+relay tasks
+   run in the supervisor coro until the child exits.
+
+6. **`__notes__` via `add_note()` for the CPE
+   `.stderr`.** The `.stderr` attribute is what
+   `subprocess` callers expect; the `add_note()` is
+   what trio's exception-rendering shows. Both wired so
+   programmatic AND human consumers see the stderr at
+   teardown.
+
+## Honesty statement
+
+This file's content is RECONSTRUCTED from the staged
+code, not extracted from a verbatim model transcript.
+The prompt-io skill's intent is for the `.raw.md` to
+be a pre-edit fossil; that's not possible here. Future
+work should write the prompt-io entry DURING the
+design session.

ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.md

@@ -0,0 +1,93 @@
+---
+model: claude-fable-5[1m]
+service: claude
+session: 0780a862-e19a-4f0a-86cd-c8afc0997757
+timestamp: 2026-06-11T17:51:52Z
+git_ref: 8526985c
+scope: docs+code+config
+substantive: true
+raw_file: 20260611T175152Z_8526985c_prompt_io.raw.md
+---
+
+## Prompt
+
+> we need big boi docs; ours are way out of date and generally
+> terrible. i'd like to use a sphinx theme in the vein and/or
+> one-of/nearly-the-same-as used in one or all of the `msgspec`,
+> `numpy`, `ray`, `xonsh`, `polars` projects.
+>
+> see the following oustanding but now very old issues to guide
+> you: #175, #126, #123, #157
+>
+> we should try to target a 3 columned sphinx theme with,
+> - document index-nav on left,
+> - body content in middle,
+> - diagrams (ideally in d2lang if possible) on RHS
+>
+> optimize for (if possible),
+> - reusing examples code without duplication in docs,
+> - generating new examples from todos throughout code base,
+> - distilling the essence of SC across processes in the simplest
+>   and most friendly way possible.
+>
+> do this work in a /open-wkt and do you best without my guidance
+> for the first major pass - we will refine asap once you are
+> complete.
+
+Session settings: `/effort max` + ultracode (multi-agent workflow
+orchestration). Fully autonomous first pass; two orchestrated
+agent fleets were used (6-agent recon survey, then 10-agent
+content fan-out: 9 section writers + 1 examples smith), with the
+orchestrator authoring the landing page, SC essay, sphinx
+scaffold, d2 pipeline + diagram sources, CI workflow and all
+integration/fix passes directly.
+
+## Response summary
+
+Complete sphinx docs revamp on branch `wkt/big_boi_docs`:
+`pydata-sphinx-theme` 0.18 (3-column: left nav / content /
+page-toc, with d2 diagrams + asides floated into the RHS margin
+via custom CSS), sphinx 9.1, a local `.. d2::` directive
+rendering `docs/diagrams/*.d2` sources with committed-SVG
+fallback, a vendored `.. margin::` directive, ~25 new doc pages
+(landing, start/, explain/, 12 guides, 10 api-ref pages,
+project/), 5 new auto-tested examples + 3 modernized + 1
+renamed, and a gh-pages deploy workflow (issue #123). All
+example code is `literalinclude`d from `examples/` (zero
+duplication, CI-verified). Build: green, 24 warnings all
+pre-existing-docstring/NEWS sourced.
+
+## Files changed
+
+See the branch diff (uncommitted at entry-write time):
+
+> `git diff test_cpu_throttling..wkt/big_boi_docs`
+> `git -C <wkt> status --short` (pre-commit working tree)
+
+- `docs/conf.py` — full rewrite for pydata theme + ext stack
+- `docs/_ext/d2diagrams.py` — new `.. d2::` sphinx directive
+- `docs/_ext/marginalia.py` — new `.. margin::` directive
+- `docs/_static/css/custom.css` — b&w skin + RHS margin floats
+- `docs/diagrams/*.d2` (7) — diagram sources (sketch/grayscale)
+- `docs/_diagrams/*.svg` (7) — committed rendered fallbacks
+- `docs/index.rst` — new landing (replaces dead-API doc)
+- `docs/start/*.rst` (3), `docs/explain/*.rst` (3),
+  `docs/guide/*.rst` (13), `docs/api/*.rst` (10),
+  `docs/project/*.rst` (3) — new content tree
+- `docs/dev_tips.rst` — removed (ported to project/dev-tips)
+- `examples/{typed_payloads,nested_actor_tree,
+  service_daemon_discovery,uds_transport_actor_tree,
+  streaming_broadcast_fanout}.py` — new, smoke-tested
+- `examples/{a_trynamic_first_scene,
+  actor_spawning_and_causality,parallelism/single_func}.py` —
+  `.result()` -> `.wait_for_result()` modernization
+- `examples/parallelism/concurrent_futures_primes.py` — renamed
+  from leading-underscore + trio-runner shim added
+- `pyproject.toml` — `docs` dependency-group filled in
+- `uv.lock` — relock for docs group
+- `.github/workflows/docs.yml` — build + gh-pages deploy
+
+## Human edits
+
+None yet — entry written pre-commit; the author reviews, stages
+and commits manually (per repo workflow policy).

ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.raw.md

@@ -0,0 +1,49 @@
+---
+model: claude-fable-5[1m]
+service: claude
+timestamp: 2026-06-11T17:51:52Z
+git_ref: 8526985c
+diff_cmd: git diff test_cpu_throttling..wkt/big_boi_docs
+---
+
+# Raw output pointers (diff-ref mode)
+
+All generated content is code/config/docs committed alongside
+this entry on branch `wkt/big_boi_docs`; per the prompt-io
+diff-ref decision rule each file's verbatim content is the diff
+itself rather than a copy here:
+
+> `git diff test_cpu_throttling..wkt/big_boi_docs -- docs/`
+> `git diff test_cpu_throttling..wkt/big_boi_docs -- examples/`
+> `git diff test_cpu_throttling..wkt/big_boi_docs -- pyproject.toml uv.lock .github/`
+
+## Generation notes (non-code output summary)
+
+- Theme research (web, agent-verified 2026-06-11): msgspec=furo,
+  xonsh=furo, numpy/ray/polars=pydata-sphinx-theme (ray migrated
+  off sphinx-book-theme); sphinx-book-theme 1.2.0 hard-pins
+  pydata 0.16.1 (stale) -> chose pydata 0.18 + sphinx 9.1.
+- d2 ecosystem: no production-grade pypi extension exists
+  (sphinxcontrib-d2lang 0.0.5 ignores returncodes, uuid4 output
+  names; sphinx-d2 is an empty stub) -> wrote local
+  `docs/_ext/d2diagrams.py` (~230 LOC) with D2_BIN env
+  discovery, mtime caching, committed-SVG fallback and
+  literal-block last resort.
+- Diagrams authored in d2 (theme-id 1 "Neutral Grey" + sketch
+  mode + ELK layout, validated by render + headless-firefox
+  screenshot loop): actor_tree, context_handshake (real
+  msg-spec names Start/StartAck/Started/Yield/Stop/Return),
+  streaming_pipeline, runtime_stack, debug_lock,
+  error_propagation, infected_aio.
+- API truth enforced from a 6-agent recon pass over the
+  reorganized package tree (runtime/, discovery/, spawn/, ipc/,
+  msg/, devx/, trionics/): docs teach `.wait_for_result()`,
+  registrar (not arbiter) naming, `@tractor.context` +
+  `open_context()` as the core model, `run_in_actor()` as
+  convenience only.
+- All ~30 literalincluded example scripts verified present; 9
+  touched/new example files smoke-run green (exit 0, <16s).
+- Final build: `sphinx-build -b html` succeeded; 24 residual
+  warnings, every one sourced from pre-existing library
+  docstring rst-isms or legacy NEWS.rst content (left untouched
+  by design; flagged for a follow-up docstring lint pass).

ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.md

@@ -0,0 +1,65 @@
+---
+model: claude-fable-5[1m]
+service: claude
+session: 638d5a98-abd2-4217-a447-19f2330eb334
+timestamp: 2026-06-25T23:25:06Z
+git_ref: 0a3c48fc
+scope: code
+substantive: true
+raw_file: 20260625T232506Z_0a3c48fc_prompt_io.raw.md
+---
+
+## Prompt
+
+Same `/code-review` follow-up session (PR #460). Finding #10:
+the new `api/` autodoc reference pages surfaced 22 docutils
+warnings sourced from informal reST in public docstrings. The
+user opted to fix it on this branch,
+
+> well we're on a clean main so why not just do these now too?
+
+Goal: drive the docs build warning-free (24 -> 0) without any
+code/behaviour change — docstring content only.
+
+## Response summary
+
+Surgical docstring-RST lint across 9 library modules + the one
+offending `NEWS.rst` changelog entry,
+
+- bullet lists given a blank line + base-column indent
+  (`Context`, `Context.cancel_called`/`.cancelled_caught`/
+  `.outcome`, `ActorNursery.cancel_called`, `query_actor`,
+  `open_crash_handler`, the `#318` `NEWS.rst` entry),
+- the under-short `Behaviour:` underline in `Context.cancel`
+  demoted to a `**bold**` label,
+- unbalanced/pluralized-role backticks fixed — closed the
+  `wait_for_actor` summary backtick; applied the `` `role`\ s ``
+  escaped-plural idiom in `gather_contexts`, `mk_pdb`,
+  `MsgCodec`, msg `Error`, `open_context_from_portal`,
+- the `|_` method-tree in `ContextCancelled.canceller` made a
+  literal block (bare `|` was parsed as a substitution ref).
+
+Verified: build `24 -> 0` warnings; `import tractor` clean under
+`-W error::SyntaxWarning`; the `\ s` idiom renders as e.g.
+"acms" (no backslash/space leak in HTML); `ruff` clean; diff
+confirmed docstring-content-only.
+
+Initial generation was delegated to a constrained subagent
+(docstring-only edits + a rebuild-to-zero verification gate);
+the orchestrator independently re-built, reviewed the full
+diff, and added the `NEWS.rst` fix to reach zero.
+
+## Files changed
+
+- `tractor/_context.py`, `tractor/_exceptions.py`,
+  `tractor/devx/debug/_post_mortem.py`,
+  `tractor/devx/debug/_repl.py`, `tractor/discovery/_api.py`,
+  `tractor/msg/_codec.py`, `tractor/msg/types.py`,
+  `tractor/runtime/_supervise.py`,
+  `tractor/trionics/_mngrs.py` — docstring reST fixes,
+- `NEWS.rst` — blank line before a bullet list in the `#318`
+  entry.
+
+## Human edits
+
+None — committed as generated (`0a3c48fc`).

ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.raw.md

@@ -0,0 +1,35 @@
+---
+model: claude-fable-5[1m]
+service: claude
+timestamp: 2026-06-25T23:25:06Z
+git_ref: 0a3c48fc
+diff_cmd: git diff 0a3c48fc~1..0a3c48fc
+---
+
+# Raw output pointers (diff-ref mode)
+
+The generated patch is committed; the verbatim content is the
+diff:
+
+> `git diff 0a3c48fc~1..0a3c48fc`
+
+## Generation notes (non-code, verbatim)
+
+- Pure docstring-content edits; no signatures, logic, or
+  non-docstring lines touched (confirmed via `git diff` review).
+- reST fix patterns applied: blank-line + base-column indent
+  for bullet lists ("Unexpected indentation" / "Definition
+  list ..." / "Block quote ..."); `**bold**` in place of an
+  under-length section underline ("Title underline too short");
+  closing/escaping backticks ("Inline interpreted text ...
+  without end-string"); literal-block for an ASCII tree whose
+  `|` chars tripped "Inline substitution_reference ...".
+- The pluralized-role idiom is written `\\ s` in the Python
+  source (so the runtime docstring holds `` `role`\ s ``); a
+  bare `\ ` would raise a 3.13 invalid-escape SyntaxWarning.
+  Verified clean via `python -W error::SyntaxWarning -c
+  "import tractor"`.
+- Verification gate: `sphinx-build` warning count 24 -> 2
+  (subagent, docstrings only) -> 0 after the orchestrator added
+  the `NEWS.rst` blank-line fix; rendered-HTML spot-check
+  confirmed no literal `\ s` leak; `ruff check` clean.

ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.md

@@ -0,0 +1,64 @@
+---
+model: claude-fable-5[1m]
+service: claude
+session: 638d5a98-abd2-4217-a447-19f2330eb334
+timestamp: 2026-06-25T23:25:06Z
+git_ref: 3a5cfde0
+scope: code
+substantive: true
+raw_file: 20260625T232506Z_3a5cfde0_prompt_io.raw.md
+---
+
+## Prompt
+
+Follow-up to a `/code-review` of PR #460 (this branch) which
+surfaced lower-severity findings in the `.. d2::` sphinx
+directive. The user's driving instructions across the session,
+
+> yup do both *at least*, then report back.
+
+(re: "implement #7 (+ optionally #8) on the branch") and,
+
+> well we're on a clean main so why not just do these now too?
+
+(re: also doing #9). The three findings being addressed,
+
+- #7: a `d2` render that is *attempted and fails* (binary
+  present but errors on the source) silently degraded to the
+  stale committed SVG and the build still exited 0,
+- #8: `parallel_*_safe = True` was declared while `run()`
+  writes the shared output SVG during the read phase (torn
+  write under `sphinx-build -j`),
+- #9: output keyed only by `src.stem` so two `.d2` sources
+  with the same stem collide.
+
+## Response summary
+
+Reworked `docs/_ext/d2diagrams.py`,
+
+- `render_svg()` now returns a `RenderResult` tristate
+  (`OK` / `FELL_BACK` / `NO_OUTPUT` / `FAILED`) so `run()` can
+  distinguish a graceful no-binary fallback from a real render
+  failure; `FAILED` emits a `reporter.error` (build fails under
+  `-W`),
+- the render writes into a sibling temp-file then `os.replace()`
+  (atomic) so a failed/torn render can never clobber a good
+  committed SVG,
+- a per-build `_seen_outputs` map (reset on `builder-inited`)
+  errors on a same-stem output collision.
+
+Verified: a corrupted `.d2` errors under `-W` (exit 1) with the
+committed SVG byte-unchanged; the collision guard fires on a
+duplicate stem; `nix run nixpkgs#d2` render path + atomic swap
+leave no temp residue; `ruff` clean.
+
+## Response summary (cont.) — Files changed
+
+- `docs/_ext/d2diagrams.py` — tristate render result, atomic
+  temp-file render, output-collision guard, doc-string policy
+  update.
+
+## Human edits
+
+None — committed as generated (`3a5cfde0`). The user noted
+follow-up refinements may come in later commits.

ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.raw.md

@@ -0,0 +1,35 @@
+---
+model: claude-fable-5[1m]
+service: claude
+timestamp: 2026-06-25T23:25:06Z
+git_ref: 3a5cfde0
+diff_cmd: git diff 3a5cfde0~1..3a5cfde0
+---
+
+# Raw output pointers (diff-ref mode)
+
+The generated patch is committed; per the diff-ref decision
+rule the verbatim content is the diff itself:
+
+> `git diff 3a5cfde0~1..3a5cfde0 -- docs/_ext/d2diagrams.py`
+
+## Generation notes (non-code, verbatim)
+
+- `RenderResult` enum added; `render_svg()` return type changed
+  `bool -> RenderResult`. Mapping in `run()`: `FAILED` ->
+  `state_machine.reporter.error(...)`, `NO_OUTPUT` -> raw `.d2`
+  source as a `literal_block`, `OK`/`FELL_BACK` -> `image`.
+- Atomicity via `tempfile.mkstemp(dir=out.parent, ...)` +
+  `os.replace(tmp, out)`; temp unlinked on any failure path.
+- Collision guard: module-level `_seen_outputs: dict[str,str]`
+  keyed by output basename, cleared by a `builder-inited`
+  handler connected in `setup()`.
+- `parallel_read_safe`/`parallel_write_safe` kept `True` but
+  now justified by the atomic swap (documented inline).
+- Empirical verification performed before commit:
+  - broken `.d2` + `sphinx-build -W` -> exit 1, ERROR node
+    rendered, committed `actor_tree.svg` md5 unchanged,
+  - duplicate-stem orphan page -> "d2 output collision" error,
+  - `nix run nixpkgs#d2` forced re-render -> deterministic
+    (no git drift), no `.tmp` residue,
+  - `ruff check` clean.

ai/prompt-io/claude/README.md

@@ -0,0 +1,27 @@
+# AI Prompt I/O Log — claude
+
+This directory tracks prompt inputs and model
+outputs for AI-assisted development using
+`claude` (Claude Code).
+
+## Policy
+
+Prompt logging follows the
+[NLNet generative AI policy][nlnet-ai].
+All substantive AI contributions are logged
+with:
+- Model name and version
+- Timestamps
+- The prompts that produced the output
+- Unedited model output (`.raw.md` files)
+
+[nlnet-ai]: https://nlnet.nl/foundation/policies/generativeAI/
+
+## Usage
+
+Entries are created by the `/prompt-io` skill
+or automatically via `/commit-msg` integration.
+
+Human contributors remain accountable for all
+code decisions. AI-generated content is never
+presented as human-authored work.

ai/prompt-io/prompts/multiaddr_declare_eps.md

@@ -0,0 +1,76 @@
+ok now i want you to take a look at the most recent commit adding
+a `tpt_bind_addrs` to `open_root_actor()` and extend the existing
+tests/discovery/test_multiaddr* and friends to use this new param in
+at least one suite with parametrizations over,
+
+- `registry_addrs == tpt_bind_addrs`, as in both inputs are the same.
+- `set(registry_addrs) >= set(tpt_bind_addrs)`, as in the registry
+  addrs include the bind set.
+- `registry_addrs != tpt_bind_addrs`, where the reg set is disjoint from
+  the bind set in all possible combos you can imagine.
+
+All of the ^above cases should further be parametrized over,
+- the root being the registrar,
+- a non-registrar root using our bg `daemon` fixture.
+
+once we have a fairly thorough test suite and have flushed out all
+bugs and edge cases we want to design a wrapping API which allows
+declaring full tree's of actors tpt endpoints using multiaddrs such
+that a `dict[str, list[str]]` of actor-name -> multiaddr can be used
+to configure a tree of actors-as-services given such an input
+"endpoints-table" can be matched with the number of appropriately
+named subactore spawns in a `tractor` user-app.
+
+Here is a small example from piker,
+
+- in piker's root conf.toml we define a `[network]` section which can
+  define various actor-service-daemon names set to a maddr
+  (multiaddress str).
+
+- each actor whether part of the `pikerd` tree (as a sub) or spawned
+  in other non-registrar rooted trees (such as `piker chart`) should
+  configurable in terms of its `tractor` tpt bind addresses via
+  a simple service lookup table,
+
+  ```toml
+  [network]
+  pikerd = [
+    '/ip4/127.0.0.1/tcp/6116',  # std localhost daemon-actor tree
+    '/uds/run/user/1000/piker/pikerd@6116.sock',  # same but serving UDS
+  ]
+  chart = [
+    '/ip4/127.0.0.1/tcp/3333',  # std localhost daemon-actor tree
+    '/uds/run/user/1000/piker/chart@3333.sock',
+  ]
+  ```
+
+We should take whatever common API is needed to support this and
+distill it into a
+```python
+tractor.discovery.parse_endpoints(
+) -> dict[
+  str,
+  list[Address]
+  |dict[str, list[Address]]
+  # ^recursive case, see below
+]:
+```
+
+style API which can,
+
+- be re-used easily across dependent projects.
+- correctly raise tpt-backend support errors when a maddr specifying
+  a unsupport proto is passed.
+- be used to handle "tunnelled" maddrs per
+  https://github.com/multiformats/py-multiaddr/#tunneling such that
+  for any such tunneled maddr-`str`-entry we deliver a data-structure
+  which can easily be passed to nested `@acm`s which consecutively
+  setup nested net bindspaces for binding the endpoint addrs using
+  a combo of our `.ipc.*` machinery and, say for example something like
+  https://github.com/svinota/pyroute2, more precisely say for
+  managing tunnelled wireguard eps within network-namespaces,
+  * https://docs.pyroute2.org/
+  * https://docs.pyroute2.org/netns.html
+
+remember to include use of all default `.claude/skills` throughout
+this work!

ai/prompt-io/prompts/subints_spawner.md

@@ -0,0 +1,34 @@
+This is your first big boi, "from GH issue" design, plan and
+implement task.
+
+We need to try and add sub-interpreter (aka subint) support per the
+issue,
+
+https://github.com/goodboy/tractor/issues/379
+
+Part of this work should include,
+
+- modularizing and thus better organizing the `.spawn.*` subpkg by
+  breaking up various backends currently in `spawn._spawn` into
+  separate submods where it makes sense.
+
+- add a new `._subint` backend which tries to keep as much of the
+  inter-process-isolation machinery in use as possible but with plans
+  to optimize for localhost only benefits as offered by python's
+  subints where possible.
+
+  * utilizing localhost-only tpts like UDS, shm-buffers for
+    performant IPC between subactors but also leveraging the benefits from
+    the traditional OS subprocs mem/storage-domain isolation, linux
+    namespaces where possible and as available/permitted by whatever
+    is happening under the hood with how cpython implements subints.
+
+  * default configuration should encourage state isolation as with
+    subprocs, but explicit public escape hatches to enable rigorously
+    managed shm channels for high performance apps.
+
+- all tests should be (able to be) parameterized to use the new
+  `subints` backend and enabled by flag in the harness using the
+  existing `pytest --spawn-backend <spawn-backend>` support offered in
+  the `open_root_actor()` and `.testing._pytest` harness override
+  fixture.

ai/tooling-todos/logspec_leaf_module_granularity_route_b.md

@@ -0,0 +1,159 @@
+# Logging-spec leaf-module granularity — "Route B" (decouple
+# logger-*identity* from console-*display*)
+
+Follow-up notes recording the breaking-changes / costs of the
+deeper fix that would give the `tractor.log` logging-spec (see
+`LogSpec`/`apply_logspec()`) true **per-leaf-MODULE** level
+control — deliberately *not* taken (for now) in favour of the
+smaller sub-PACKAGE fix already landed.
+
+## Status / what already shipped
+
+The cheap, contained fix is **done**: `get_logger()`'s "strip
+#2" (`log.py`, the `pkg_path = subpkg_path` collapse) no longer
+eats a real sub-package component. It now strips the trailing
+token *only* when it duplicates the caller's leaf-*module*
+filename (which the header already shows via `{filename}`).
+
+Result:
+
+- `devx.debug` resolves to `tractor.devx.debug`, **distinct**
+  from a bare `devx` -> `tractor.devx` (its parent). So the
+  logging-spec can dial sub-package levels at any nesting depth
+  (`devx.debug:runtime` ≠ `devx:cancel`).
+- The `get_logger(__name__)` cosmetic ("don't repeat the leaf
+  module in `{name}` since `{filename}` shows it") is preserved.
+
+What is **still NOT addressable** after that fix:
+
+- **Per-leaf-MODULE** levels. Every module in a (sub-)pkg shares
+  that pkg's logger, because `get_logger()` drops the leaf
+  module-name from the logger key by design.
+- **Top-level lib modules** (eg. `tractor.to_asyncio`,
+  `__package__ == 'tractor'`) emit on the *root* `tractor`
+  logger, so a `to_asyncio:<lvl>` spec entry hits a phantom
+  child -> no-op.
+
+## What "Route B" is
+
+Make the logger's *identity* the **full dotted module path**
+(incl. the leaf module + top-level modules), eg.
+`tractor.devx.debug._tty_lock` and `tractor.to_asyncio`, and
+move the cosmetic leaf-trim out of logger-naming and into the
+**formatter's `{name}` rendering**.
+
+Net effect:
+
+- Real per-module `Logger` nodes exist in the hierarchy ->
+  the spec can target ANY module; stdlib level-inheritance and
+  propagation "just work" top-down.
+- Console headers stay clean because the formatter computes a
+  trimmed display string (drop the trailing token that equals
+  `{filename}`'s stem) instead of the logger doing it.
+
+## Why it's "broad" — breaking changes / costs
+
+The logger *name* is currently load-bearing well beyond
+display; changing it ripples:
+
+1. **Every logger name changes.**
+   Today (post sub-pkg fix) names collapse to the sub-package;
+   Route B = full module path. This touches:
+   - handler attachment points + the `getChild()` hierarchy,
+   - any `logging.getLogger('tractor.X')` string lookups,
+   - any name-based filtering,
+   - the dedup / `_strict_debug` warning logic *inside*
+     `get_logger()` itself — the `pkg_name in name`,
+     `leaf_mod in pkg_path`, "duplicate pkg-name" branches all
+     key off the *name shape* and would need re-derivation.
+
+2. **Formatter rewrite.**
+   `LOG_FORMAT` uses `{name}` == `record.name` (the full logger
+   name). To keep headers clean we must compute a *display*
+   name and inject it as a record attr (eg. `record.pkg_ns`)
+   via a `logging.Filter` or a `colorlog.ColoredFormatter`
+   subclass overriding `.format()`, then point `LOG_FORMAT` at
+   that field. The `{filename}` vs `{name}` de-dup intent has
+   to be re-implemented per-record rather than per-logger.
+
+3. **Propagation / double-emit surface grows.**
+   Full-depth loggers mean more intermediate nodes
+   (`...debug._tty_lock` -> `.debug` -> `.devx` -> `tractor`).
+   If more than one level carries a handler (spec sub-handlers
+   + a root console), records double-emit. The
+   `propagate=False` trick we already use for filter-targeted
+   sub-loggers (`apply_logspec()`) must be applied carefully
+   across a deeper tree — more levels == more places to leak a
+   dup.
+
+4. **Level-inheritance semantics shift.**
+   Today setting a level on `tractor.devx` gates *all* devx
+   emits (they share that logger). Post-Route-B,
+   `tractor.devx.debug._tty_lock` is its own `NOTSET` logger
+   that *inherits* the effective level from ancestors —
+   functionally similar via inheritance, BUT any code that does
+   `log.setLevel(...)` / reads `log.level` on a (previously
+   collapsed) logger now only affects that exact node. All
+   `setLevel`/`.level =` call sites need an audit (eg.
+   `get_logger()`'s own `log.level = rlog.level` line).
+
+5. **Downstream contract churn.**
+   `modden` / `piker` call `get_logger()` / `get_console_log()`
+   and may depend on current names — including
+   `modden.runtime.daemon.setup_tractor_logging()` which
+   asserts `'tractor' not in name` on spec parts. The header
+   `{name}` field is user-visible in everyone's logs + CI
+   output. Changing the canonical names is a public-ish
+   behavior change -> needs a version note + downstream
+   coordination (or a formatter trim that keeps the *displayed*
+   string byte-identical to today).
+
+6. **`get_logger()` refactor risk.**
+   The fn tangles two concerns: compute logger *identity* and
+   compute the *display* string. Route B forces splitting them
+   inside a ~300-line fn with multiple `_strict_debug`
+   branches, dup-warnings, and the `name=__name__` convenience.
+   High chance of subtle regressions without an exhaustive
+   name-derivation test matrix.
+
+## Migration / test plan (if pursued)
+
+- Extract a pure helper
+  `_mk_logger_name(pkg_name, mod_name, mod_pkg) -> (logger_name,
+  display_name)` and cover it with an exhaustive unit matrix:
+  auto vs explicit vs `__name__`; package-`__init__` vs leaf
+  module; nested vs flat; `pkg_name in name` vs not; top-level
+  module (`__package__ == pkg_name`).
+- Switch `get_logger()` to use it for *identity*; switch the
+  formatter to use `display_name` (via a record attr).
+- Re-run the full suite + golden-diff a sample of rendered log
+  headers to confirm zero cosmetic churn.
+- Coordinate the name change with `modden`/`piker`; bump +
+  CHANGES note.
+
+## Cheaper alternative — "Route A" (record-filter)
+
+If per-leaf control is wanted *before* committing to Route B:
+keep names collapsed, add a `logging.Filter` on the configured
+handler keyed on `record.module` / `record.pathname` that maps
+each record's source module -> its spec level. Set the base
+logger to the *minimum* level in the spec (so records aren't
+pre-dropped by the logger), and let the filter discriminate
+up/down within that floor.
+
+- Pros: no name churn, no formatter change, fully contained
+  next to `apply_logspec()`.
+- Cons: a filter can only discriminate *within* what the logger
+  admits -> base must be permissive, so `at_least_level()`
+  expensive-work guards over-admit; matching dotted spec names
+  to a `pathname` is fiddly; doesn't clean up the hierarchy
+  itself.
+
+## Recommendation
+
+- Defer Route B unless true per-module loggers are wanted as a
+  first-class feature.
+- If per-leaf control is needed soon, prefer **Route A**
+  (filter) — lower risk.
+- The shipped sub-PACKAGE fix already covers the common ask
+  (`devx.debug` vs `devx`).

docs/README.rst

@@ -1,4 +1,4 @@
-|logo| ``tractor``: distributed structurred concurrency
+|logo| ``tractor``: distributed structured concurrency
 
 ``tractor`` is a `structured concurrency`_ (SC), multi-processing_ runtime built on trio_.
 
@@ -23,16 +23,11 @@ model" looks like, and that's **intentional**.
 
 Where do i start!?
 ------------------
-The first step to grok ``tractor`` is to get an intermediate
-knowledge of ``trio`` and **structured concurrency** B)
-
-Some great places to start are,
-
-- the seminal `blog post`_
-- obviously the `trio docs`_
-- wikipedia's nascent SC_ page
-- the fancy diagrams @ libdill-docs_
+New to ``trio`` and **structured concurrency**? Our docs collect the
+best starting points and then walk you straight into a hands-on
+quickstart:
 
+  https://goodboy.github.io/tractor/start/quickstart.html
 
 Features
 --------
@@ -57,6 +52,7 @@ Features
   `discovery`_ sys with plans to support multiple `modern protocol`_
   approaches.
 - Various ``trio`` extension APIs via ``tractor.trionics`` such as,
+
   - task fan-out `broadcasting`_,
   - multi-task-single-resource-caching and fan-out-to-multi
     ``__aenter__()`` APIs for ``@acm`` functions,
@@ -98,7 +94,7 @@ the code base::
 
     # but @goodboy prefers the more explicit (and shell agnostic)
     # https://docs.astral.sh/uv/configuration/environment/#uv_project_environment
-    UV_PROJECT_ENVIRONMENT="tractor_py313
+    UV_PROJECT_ENVIRONMENT="tractor_py313"
 
     # hint hint, enter @goodboy's fave shell B)
     uv run --dev xonsh
@@ -110,545 +106,53 @@ Alongside all this we ofc offer "releases" on PyPi::
 Just note that YMMV since the main git branch is often much further
 ahead then any latest release.
 
+Hacking on the docs themselves? The build + live-preview one-liners
+(incl. nix-shell specifics) are collected in `notes_to_self/howtodocs.md
+<https://github.com/goodboy/tractor/blob/main/notes_to_self/howtodocs.md>`_,
+and rendered as the "Building these docs" section of our dev-tips guide.
+
 
 Example codez
 -------------
-In ``tractor``'s (very lacking) documention we prefer to point to
-example scripts in the repo over duplicating them in docs, but with
-that in mind here are some definitive snippets to try and hook you
-into digging deeper.
-
-
-Run a func in a process
-***********************
-Use ``trio``'s style of focussing on *tasks as functions*:
-
-.. code:: python
-
-    """
-    Run with a process monitor from a terminal using::
-
-        $TERM -e watch -n 0.1  "pstree -a $$" \
-            & python examples/parallelism/single_func.py \
-            && kill $!
-
-    """
-    import os
-
-    import tractor
-    import trio
-
-
-    async def burn_cpu():
-
-        pid = os.getpid()
-
-        # burn a core @ ~ 50kHz
-        for _ in range(50000):
-            await trio.sleep(1/50000/50)
-
-        return os.getpid()
-
-
-    async def main():
-
-        async with tractor.open_nursery() as n:
-
-            portal = await n.run_in_actor(burn_cpu)
-
-            #  burn rubber in the parent too
-            await burn_cpu()
-
-            # wait on result from target function
-            pid = await portal.result()
-
-        # end of nursery block
-        print(f"Collected subproc {pid}")
-
-
-    if __name__ == '__main__':
-        trio.run(main)
-
-
-This runs ``burn_cpu()`` in a new process and reaps it on completion
-of the nursery block.
-
-If you only need to run a sync function and retreive a single result, you
-might want to check out `trio-parallel`_.
-
-
-Zombie safe: self-destruct a process tree
-*****************************************
-``tractor`` tries to protect you from zombies, no matter what.
-
-.. code:: python
-
-    """
-    Run with a process monitor from a terminal using::
-
-        $TERM -e watch -n 0.1  "pstree -a $$" \
-            & python examples/parallelism/we_are_processes.py \
-            && kill $!
-
-    """
-    from multiprocessing import cpu_count
-    import os
-
-    import tractor
-    import trio
-
-
-    async def target():
-        print(
-            f"Yo, i'm '{tractor.current_actor().name}' "
-            f"running in pid {os.getpid()}"
-        )
-
-        await trio.sleep_forever()
-
-
-    async def main():
-
-        async with tractor.open_nursery() as n:
-
-            for i in range(cpu_count()):
-                await n.run_in_actor(target, name=f'worker_{i}')
-
-            print('This process tree will self-destruct in 1 sec...')
-            await trio.sleep(1)
-
-            # raise an error in root actor/process and trigger
-            # reaping of all minions
-            raise Exception('Self Destructed')
-
-
-    if __name__ == '__main__':
-        try:
-            trio.run(main)
-        except Exception:
-            print('Zombies Contained')
-
-
-If you can create zombie child processes (without using a system signal)
-it **is a bug**.
-
-
-"Native" multi-process debugging
-********************************
-Using the magic of `pdbp`_ and our internal IPC, we've
-been able to create a native feeling debugging experience for
-any (sub-)process in your ``tractor`` tree.
-
-.. code:: python
-
-    from os import getpid
-
-    import tractor
-    import trio
-
-
-    async def breakpoint_forever():
-        "Indefinitely re-enter debugger in child actor."
-        while True:
-            yield 'yo'
-            await tractor.breakpoint()
-
-
-    async def name_error():
-        "Raise a ``NameError``"
-        getattr(doggypants)
-
-
-    async def main():
-        """Test breakpoint in a streaming actor.
-        """
-        async with tractor.open_nursery(
-            debug_mode=True,
-            loglevel='error',
-        ) as n:
-
-            p0 = await n.start_actor('bp_forever', enable_modules=[__name__])
-            p1 = await n.start_actor('name_error', enable_modules=[__name__])
-
-            # retreive results
-            stream = await p0.run(breakpoint_forever)
-            await p1.run(name_error)
-
-
-    if __name__ == '__main__':
-        trio.run(main)
-
-
-You can run this with::
-
-    >>> python examples/debugging/multi_daemon_subactors.py
-
-And, yes, there's a built-in crash handling mode B)
-
-We're hoping to add a respawn-from-repl system soon!
-
-
-SC compatible bi-directional streaming
-**************************************
-Yes, you saw it here first; we provide 2-way streams
-with reliable, transitive setup/teardown semantics.
-
-Our nascent api is remniscent of ``trio.Nursery.start()``
-style invocation:
-
-.. code:: python
-
-    import trio
-    import tractor
-
-
-    @tractor.context
-    async def simple_rpc(
-
-        ctx: tractor.Context,
-        data: int,
-
-    ) -> None:
-        '''Test a small ping-pong 2-way streaming server.
-
-        '''
-        # signal to parent that we're up much like
-        # ``trio_typing.TaskStatus.started()``
-        await ctx.started(data + 1)
-
-        async with ctx.open_stream() as stream:
-
-            count = 0
-            async for msg in stream:
-
-                assert msg == 'ping'
-                await stream.send('pong')
-                count += 1
-
-            else:
-                assert count == 10
-
-
-    async def main() -> None:
-
-        async with tractor.open_nursery() as n:
-
-            portal = await n.start_actor(
-                'rpc_server',
-                enable_modules=[__name__],
-            )
-
-            # XXX: this syntax requires py3.9
-            async with (
-
-                portal.open_context(
-                    simple_rpc,
-                    data=10,
-                ) as (ctx, sent),
-
-                ctx.open_stream() as stream,
-            ):
-
-                assert sent == 11
-
-                count = 0
-                # receive msgs using async for style
-                await stream.send('ping')
-
-                async for msg in stream:
-                    assert msg == 'pong'
-                    await stream.send('ping')
-                    count += 1
-
-                    if count >= 9:
-                        break
-
-
-            # explicitly teardown the daemon-actor
-            await portal.cancel_actor()
-
-
-    if __name__ == '__main__':
-        trio.run(main)
-
-
-See original proposal and discussion in `#53`_ as well
-as follow up improvements in `#223`_ that we'd love to
-hear your thoughts on!
-
-.. _#53: https://github.com/goodboy/tractor/issues/53
-.. _#223: https://github.com/goodboy/tractor/issues/223
-
-
-Worker poolz are easy peasy
-***************************
-The initial ask from most new users is *"how do I make a worker
-pool thing?"*.
-
-``tractor`` is built to handle any SC (structured concurrent) process
-tree you can imagine; a "worker pool" pattern is a trivial special
-case.
-
-We have a `full worker pool re-implementation`_ of the std-lib's
-``concurrent.futures.ProcessPoolExecutor`` example for reference.
-
-You can run it like so (from this dir) to see the process tree in
-real time::
-
-    $TERM -e watch -n 0.1  "pstree -a $$" \
-        & python examples/parallelism/concurrent_actors_primes.py \
-        && kill $!
-
-This uses no extra threads, fancy semaphores or futures; all we need
-is ``tractor``'s IPC!
-
-"Infected ``asyncio``" mode
-***************************
-Have a bunch of ``asyncio`` code you want to force to be SC at the process level?
-
-Check out our experimental system for `guest`_-mode controlled
-``asyncio`` actors:
-
-.. code:: python
-
-    import asyncio
-    from statistics import mean
-    import time
-
-    import trio
-    import tractor
-
-
-    async def aio_echo_server(
-        to_trio: trio.MemorySendChannel,
-        from_trio: asyncio.Queue,
-    ) -> None:
-
-        # a first message must be sent **from** this ``asyncio``
-        # task or the ``trio`` side will never unblock from
-        # ``tractor.to_asyncio.open_channel_from():``
-        to_trio.send_nowait('start')
-
-        # XXX: this uses an ``from_trio: asyncio.Queue`` currently but we
-        # should probably offer something better.
-        while True:
-            # echo the msg back
-            to_trio.send_nowait(await from_trio.get())
-            await asyncio.sleep(0)
-
-
-    @tractor.context
-    async def trio_to_aio_echo_server(
-        ctx: tractor.Context,
-    ):
-        # this will block until the ``asyncio`` task sends a "first"
-        # message.
-        async with tractor.to_asyncio.open_channel_from(
-            aio_echo_server,
-        ) as (first, chan):
-
-            assert first == 'start'
-            await ctx.started(first)
-
-            async with ctx.open_stream() as stream:
-
-                async for msg in stream:
-                    await chan.send(msg)
-
-                    out = await chan.receive()
-                    # echo back to parent actor-task
-                    await stream.send(out)
-
-
-    async def main():
-
-        async with tractor.open_nursery() as n:
-            p = await n.start_actor(
-                'aio_server',
-                enable_modules=[__name__],
-                infect_asyncio=True,
-            )
-            async with p.open_context(
-                trio_to_aio_echo_server,
-            ) as (ctx, first):
-
-                assert first == 'start'
-
-                count = 0
-                async with ctx.open_stream() as stream:
-
-                    delays = []
-                    send = time.time()
-
-                    await stream.send(count)
-                    async for msg in stream:
-                        recv = time.time()
-                        delays.append(recv - send)
-                        assert msg == count
-                        count += 1
-                        send = time.time()
-                        await stream.send(count)
-
-                        if count >= 1e3:
-                            break
-
-            print(f'mean round trip rate (Hz): {1/mean(delays)}')
-            await p.cancel_actor()
-
-
-    if __name__ == '__main__':
-        trio.run(main)
-
-
-Yes, we spawn a python process, run ``asyncio``, start ``trio`` on the
-``asyncio`` loop, then send commands to the ``trio`` scheduled tasks to
-tell ``asyncio`` tasks what to do XD
-
-We need help refining the `asyncio`-side channel API to be more
-`trio`-like. Feel free to sling your opinion in `#273`_!
-
-
-.. _#273: https://github.com/goodboy/tractor/issues/273
-
-
-Higher level "cluster" APIs
-***************************
-To be extra terse the ``tractor`` devs have started hacking some "higher
-level" APIs for managing actor trees/clusters. These interfaces should
-generally be condsidered provisional for now but we encourage you to try
-them and provide feedback. Here's a new API that let's you quickly
-spawn a flat cluster:
-
-.. code:: python
-
-    import trio
-    import tractor
-
-
-    async def sleepy_jane():
-        uid = tractor.current_actor().uid
-        print(f'Yo i am actor {uid}')
-        await trio.sleep_forever()
-
-
-    async def main():
-        '''
-        Spawn a flat actor cluster, with one process per
-        detected core.
-
-        '''
-        portal_map: dict[str, tractor.Portal]
-        results: dict[str, str]
-
-        # look at this hip new syntax!
-        async with (
-
-            tractor.open_actor_cluster(
-                modules=[__name__]
-            ) as portal_map,
-
-            trio.open_nursery() as n,
-        ):
-
-            for (name, portal) in portal_map.items():
-                n.start_soon(portal.run, sleepy_jane)
-
-            await trio.sleep(0.5)
-
-            # kill the cluster with a cancel
-            raise KeyboardInterrupt
-
-
-    if __name__ == '__main__':
-        try:
-            trio.run(main)
-        except KeyboardInterrupt:
-            pass
-
-
-.. _full worker pool re-implementation: https://github.com/goodboy/tractor/blob/master/examples/parallelism/concurrent_actors_primes.py
-
+We prefer to point you at the runnable scripts under ``examples/``
+- each is CI-run and ``literalinclude``-d straight into the docs, so
+what you read there is what actually runs - rather than inline a
+pile of them here. The one-minute pitch: spawn a subactor per core,
+open a ``Context`` into each, then crash the root *on purpose* and
+watch the runtime reap the whole tree - zero zombies, guaranteed (if
+you can make a zombie child without a system signal, it **is a
+bug**).
+
+See it run - plus the full tour (the flagship multi-process
+debugger, bidirectional streaming over a ``Context``, cancellation,
+discovery, "infected ``asyncio``", typed messaging and worker-pool /
+cluster patterns) - in the docs:
+
+- docs: https://goodboy.github.io/tractor/
+- examples: https://github.com/goodboy/tractor/tree/main/examples
 
 Under the hood
 --------------
-``tractor`` is an attempt to pair trionic_ `structured concurrency`_ with
-distributed Python. You can think of it as a ``trio``
-*-across-processes* or simply as an opinionated replacement for the
-stdlib's ``multiprocessing`` but built on async programming primitives
-from the ground up.
+``tractor`` is an attempt to pair trionic_ `structured
+concurrency`_ with distributed Python - think of it as ``trio``
+*-across-processes*, or as an opinionated replacement for the
+stdlib's ``multiprocessing`` built on async primitives from the
+ground up. But really it **is just** ``trio``: nurseries that
+spawn *processes* and cancel-able streaming IPC between them. If
+you can drive ``trio``, you can drive ``tractor``.
 
-Don't be scared off by this description. ``tractor`` **is just** ``trio``
-but with nurseries for process management and cancel-able streaming IPC.
-If you understand how to work with ``trio``, ``tractor`` will give you
-the parallelism you may have been needing.
+"But wait - don't 'actors' have mailboxes and messages and
+stuff?!" Well, we've got (well referenced) opinions on what an "actor
+model" **actually is** (tl;dr: the `3 axioms`_, not the cultural
+baggage) - that whole riff lives in our docs:
 
+  https://goodboy.github.io/tractor/explain/sc-distributed.html#hold-up-is-this-an-actor-model
 
-Wait, huh?! I thought "actors" have messages, and mailboxes and stuff?!
-***********************************************************************
-Let's stop and ask how many canon actor model papers have you actually read ;)
-
-From our experience many "actor systems" aren't really "actor models"
-since they **don't adhere** to the `3 axioms`_ and pay even less
-attention to the problem of *unbounded non-determinism* (which was the
-whole point for creation of the model in the first place).
-
-From the author's mouth, **the only thing required** is `adherance to`_
-the `3 axioms`_, *and that's it*.
-
-``tractor`` adheres to said base requirements of an "actor model"::
-
-    In response to a message, an actor may:
-
-    - send a finite number of new messages
-    - create a finite number of new actors
-    - designate a new behavior to process subsequent messages
-
-
-**and** requires *no further api changes* to accomplish this.
-
-If you want do debate this further please feel free to chime in on our
-chat or discuss on one of the following issues *after you've read
-everything in them*:
-
-- https://github.com/goodboy/tractor/issues/210
-- https://github.com/goodboy/tractor/issues/18
-
-
-Let's clarify our parlance
-**************************
-Whether or not ``tractor`` has "actors" underneath should be mostly
-irrelevant to users other then for referring to the interactions of our
-primary runtime primitives: each Python process + ``trio.run()``
-+ surrounding IPC machinery. These are our high level, base
-*runtime-units-of-abstraction* which both *are* (as much as they can
-be in Python) and will be referred to as our *"actors"*.
-
-The main goal of ``tractor`` is is to allow for highly distributed
-software that, through the adherence to *structured concurrency*,
-results in systems which fail in predictable, recoverable and maybe even
-understandable ways; being an "actor model" is just one way to describe
-properties of the system.
-
-
-What's on the TODO:
--------------------
-Help us push toward the future of distributed `Python`.
-
-- Erlang-style supervisors via composed context managers (see `#22
-  <https://github.com/goodboy/tractor/issues/22>`_)
-- Typed messaging protocols (ex. via ``msgspec.Struct``, see `#36
-  <https://github.com/goodboy/tractor/issues/36>`_)
-- Typed capability-based (dialog) protocols ( see `#196
-  <https://github.com/goodboy/tractor/issues/196>`_ with draft work
-  started in `#311 <https://github.com/goodboy/tractor/pull/311>`_)
-- We **recently disabled CI-testing on windows** and need help getting
-  it running again! (see `#327
-  <https://github.com/goodboy/tractor/pull/327>`_). **We do have windows
-  support** (and have for quite a while) but since no active hacker
-  exists in the user-base to help test on that OS, for now we're not
-  actively maintaining testing due to the added hassle and general
-  latency..
-
+What's on the TODO
+------------------
+The roadmap lives with our docs - see `what the future holds
+<https://goodboy.github.io/tractor/project/index.html#what-the-future-holds>`_
+for where ``tractor`` is headed.
 
 Feel like saying hi?
 --------------------
@@ -659,36 +163,24 @@ say hi, please feel free to reach us in our `matrix channel`_.  If
 matrix seems too hip, we're also mostly all in the the `trio gitter
 channel`_!
 
-.. _structured concurrent: https://trio.discourse.group/t/concise-definition-of-structured-concurrency/228
 .. _distributed: https://en.wikipedia.org/wiki/Distributed_computing
 .. _multi-processing: https://en.wikipedia.org/wiki/Multiprocessing
 .. _trio: https://github.com/python-trio/trio
 .. _nurseries: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/#nurseries-a-structured-replacement-for-go-statements
 .. _actor model: https://en.wikipedia.org/wiki/Actor_model
 .. _trionic: https://trio.readthedocs.io/en/latest/design.html#high-level-design-principles
-.. _async sandwich: https://trio.readthedocs.io/en/latest/tutorial.html#async-sandwich
 .. _3 axioms: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=162s
 .. .. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts
-.. _adherance to: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=1821s
 .. _trio gitter channel: https://gitter.im/python-trio/general
 .. _matrix channel: https://matrix.to/#/!tractor:matrix.org
 .. _broadcasting: https://github.com/goodboy/tractor/pull/229
-.. _modern procotol: https://en.wikipedia.org/wiki/Rendezvous_protocol
 .. _pdbp: https://github.com/mdmintz/pdbp
 .. _pdb++: https://github.com/pdbpp/pdbpp
 .. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
 .. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
 .. _discovery: https://zguide.zeromq.org/docs/chapter8/#Discovery
 .. _modern protocol: https://en.wikipedia.org/wiki/Rendezvous_protocol
-.. _messages: https://en.wikipedia.org/wiki/Message_passing
-.. _trio docs: https://trio.readthedocs.io/en/latest/
-.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
 .. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html
-.. _unrequirements: https://en.wikipedia.org/wiki/Actor_model#Direct_communication_and_asynchrony
-.. _async generators: https://www.python.org/dev/peps/pep-0525/
-.. _trio-parallel: https://github.com/richardsheridan/trio-parallel
 .. _uv: https://docs.astral.sh/uv/
 .. _msgspec: https://jcristharif.com/msgspec/
 .. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops
@@ -699,10 +191,10 @@ channel`_!
 .. |gh_actions| image:: https://github.com/goodboy/tractor/actions/workflows/ci.yml/badge.svg?branch=main
     :target: https://github.com/goodboy/tractor/actions/workflows/ci.yml
 
-.. |docs| image:: https://readthedocs.org/projects/tractor/badge/?version=latest
-    :target: https://tractor.readthedocs.io/en/latest/?badge=latest
-    :alt: Documentation Status
+.. |docs| image:: https://github.com/goodboy/tractor/actions/workflows/docs.yml/badge.svg?branch=main
+    :target: https://goodboy.github.io/tractor/
+    :alt: Documentation
 
-.. |logo| image:: _static/tractor_logo_side.svg
+.. |logo| image:: _static/tractor_logo_wire.svg
     :width: 250
     :align: middle

docs/_ext/d2diagrams.py

@@ -0,0 +1,387 @@
+# tractor: distributed structured concurrency.
+'''
+``.. d2::`` - embed d2lang_ diagrams in sphinx docs
+with build-time rendering and a committed-SVG
+fallback.
+
+Rendering policy,
+
+- when a ``d2`` binary is found (see discovery order
+  below) any out-of-date SVG is (re)rendered from its
+  ``.d2`` source (normally kept in ``docs/diagrams/``)
+  into ``docs/_diagrams/``,
+- otherwise any pre-rendered (and git committed) SVG
+  already in ``docs/_diagrams/`` is used as-is,
+- when neither is possible the diagram *source* is
+  emitted as a literal block so no content is ever
+  silently dropped.
+
+A render that is *attempted and fails* (a ``d2`` bin is
+present but errors on the source) is NOT silently
+degraded to the stale committed SVG: it raises a
+docutils error (so ``sphinx-build -W`` fails the
+build). The render is also atomic — a failed/torn
+render can never clobber a good committed SVG — so the
+last-good diagram survives a bad edit.
+
+Binary discovery order,
+
+- the ``D2_BIN`` env var; may contain args which are
+  split via `shlex`, eg.
+  ``D2_BIN='nix run nixpkgs#d2 --'``,
+- the ``d2_bin`` sphinx config value,
+- ``shutil.which('d2')``.
+
+Usage,
+
+.. code:: rst
+
+    .. d2:: diagrams/actor_tree.d2
+       :caption: A tree of ``trio``-task-trees.
+       :margin:
+
+.. _d2lang: https://d2lang.com
+
+'''
+from __future__ import annotations
+
+import enum
+import hashlib
+import os
+from pathlib import Path
+import re
+import shlex
+import shutil
+import subprocess as sp
+import tempfile
+
+from docutils import nodes
+from docutils.parsers.rst import directives
+from sphinx.application import Sphinx
+from sphinx.util import logging
+from sphinx.util.docutils import SphinxDirective
+
+log = logging.getLogger(__name__)
+
+# subdir (under the sphinx srcdir) holding rendered,
+# git-committed, fallback SVG outputs.
+_outdir: str = '_diagrams'
+
+# per-build map of {output-svg-name: source-relpath} used
+# to detect 2 distinct `.d2` sources colliding on a single
+# output stem; reset on each `builder-inited` (see `setup`).
+_seen_outputs: dict[str, str] = {}
+
+
+class RenderResult(enum.Enum):
+    '''
+    Outcome of a `render_svg()` call.
+
+    '''
+    OK = 'ok'                # fresh SVG exists on disk
+    FELL_BACK = 'fell_back'  # no bin; serving committed SVG
+    NO_OUTPUT = 'no_output'  # no bin AND no committed SVG
+    FAILED = 'failed'        # bin present, render errored
+
+
+def find_d2(
+    app: Sphinx,
+) -> list[str]|None:
+    '''
+    Resolve the d2 render command as an argv list or
+    `None` when no binary can be found.
+
+    '''
+    if env_bin := os.environ.get('D2_BIN'):
+        return shlex.split(env_bin)
+    if cfg_bin := app.config.d2_bin:
+        return shlex.split(cfg_bin)
+    if path_bin := shutil.which('d2'):
+        return [path_bin]
+    return None
+
+
+def render_svg(
+    app: Sphinx,
+    src: Path,
+    out: Path,
+) -> RenderResult:
+    '''
+    Maybe (re)render `src` -> `out` and report the
+    outcome as a `RenderResult`.
+
+    A render is performed only when `out` is missing or
+    older than `src` AND a `d2` binary is available. The
+    write is atomic (temp-file + `os.replace`) so a
+    failed or torn render never clobbers an existing
+    (committed) SVG.
+
+    '''
+    fresh: bool = (
+        out.exists()
+        and
+        src.stat().st_mtime <= out.stat().st_mtime
+    )
+    if fresh:
+        return RenderResult.OK
+    d2cmd: list[str]|None = find_d2(app)
+    if d2cmd is None:
+        # no binary: fall back to whatever is committed,
+        # else signal the caller to emit the raw source.
+        if out.exists():
+            log.info(
+                f'no d2 binary; using committed svg '
+                f'for {src.name}'
+            )
+            return RenderResult.FELL_BACK
+        return RenderResult.NO_OUTPUT
+    out.parent.mkdir(
+        parents=True,
+        exist_ok=True,
+    )
+    # render into a sibling temp-file first so a bad
+    # `d2` exit (or a crash mid-write) leaves any prior
+    # committed SVG fully intact.
+    fd, tmpname = tempfile.mkstemp(
+        dir=str(out.parent),
+        prefix=f'.{out.stem}.',
+        suffix='.svg.tmp',
+    )
+    os.close(fd)
+    tmp = Path(tmpname)
+    argv: list[str] = (
+        d2cmd
+        + list(app.config.d2_args)
+        + [str(src), str(tmp)]
+    )
+    try:
+        proc = sp.run(
+            argv,
+            capture_output=True,
+            text=True,
+            timeout=120,
+        )
+    except (
+        OSError,
+        sp.TimeoutExpired,
+    ) as err:
+        tmp.unlink(missing_ok=True)
+        log.warning(
+            f'd2 invocation failed for {src.name}: '
+            f'{err}'
+        )
+        return RenderResult.FAILED
+    if proc.returncode != 0:
+        tmp.unlink(missing_ok=True)
+        log.warning(
+            f'd2 render error for {src.name}:\n'
+            f'{proc.stderr}'
+        )
+        return RenderResult.FAILED
+    # atomic swap-in of the freshly rendered SVG.
+    os.replace(tmp, out)
+    return RenderResult.OK
+
+
+class D2Diagram(SphinxDirective):
+    '''
+    Render a ``.d2`` source file (path relative to
+    the sphinx srcdir) as an SVG figure.
+
+    '''
+    required_arguments = 1
+    has_content = False
+    option_spec = {
+        'caption': directives.unchanged,
+        'alt': directives.unchanged,
+        'width': (
+            directives.length_or_percentage_or_unitless
+        ),
+        'margin': directives.flag,
+        'class': directives.class_option,
+        'name': directives.unchanged,
+    }
+
+    def run(self) -> list[nodes.Node]:
+        relsrc: str = self.arguments[0]
+        srcdir = Path(self.env.srcdir)
+        src: Path = srcdir / relsrc
+        self.env.note_dependency(relsrc)
+        if not src.exists():
+            err = self.state_machine.reporter.error(
+                f'd2 source not found: {relsrc}',
+                line=self.lineno,
+            )
+            return [err]
+        out: Path = (
+            srcdir
+            / _outdir
+            / f'{src.stem}.svg'
+        )
+        # collision guard: two distinct sources must not
+        # map onto the same output stem within a build.
+        prior: str|None = _seen_outputs.get(out.name)
+        if (
+            prior is not None
+            and
+            prior != relsrc
+        ):
+            err = self.state_machine.reporter.error(
+                f'd2 output collision: {relsrc!r} and '
+                f'{prior!r} both render to '
+                f'{_outdir}/{out.name}; rename one '
+                f'`.d2` stem',
+                line=self.lineno,
+            )
+            return [err]
+        _seen_outputs[out.name] = relsrc
+
+        result: RenderResult = render_svg(
+            self.env.app,
+            src,
+            out,
+        )
+        if result is RenderResult.FAILED:
+            # loud, build-failing (under `-W`) signal; the
+            # prior committed SVG, if any, is untouched.
+            err = self.state_machine.reporter.error(
+                f'd2 render failed for {relsrc} (see '
+                f'build log); the committed svg, if any, '
+                f'was left untouched',
+                line=self.lineno,
+            )
+            return [err]
+        if result is RenderResult.NO_OUTPUT:
+            # last resort: emit the raw d2 source so no
+            # content is ever silently dropped.
+            log.warning(
+                f'no svg available for {relsrc}; '
+                f'emitting d2 source as literal block'
+            )
+            src_text: str = src.read_text()
+            literal = nodes.literal_block(
+                src_text,
+                src_text,
+            )
+            literal['language'] = 'text'
+            return [literal]
+        # OK | FELL_BACK -> embed the SVG figure.
+        img = nodes.image(
+            uri=f'/{_outdir}/{out.name}',
+            alt=self.options.get(
+                'alt',
+                f'd2 diagram: {src.stem}',
+            ),
+        )
+        if width := self.options.get('width'):
+            img['width'] = width
+        # content-hash the rendered svg so the served
+        # `<img src>` carries a `?v=<hash>` cache-buster
+        # (sphinx tags css/js this way but not images);
+        # without it an edited diagram keeps showing the
+        # browser's stale copy at the stable
+        # `_images/<stem>.svg` url on autobuild reload.
+        if out.exists():
+            img['d2_stem'] = out.stem
+            img['d2_cachebust'] = hashlib.sha256(
+                out.read_bytes()
+            ).hexdigest()[:8]
+        fig = nodes.figure()
+        fig += img
+        classes: list[str] = (
+            ['d2-diagram']
+            + self.options.get('class', [])
+        )
+        if 'margin' in self.options:
+            # NB: the bare 'margin' class is what
+            # book-style themes key off for
+            # right-margin placement; our custom css
+            # uses 'd2-margin'.
+            classes += [
+                'margin',
+                'd2-margin',
+            ]
+        fig['classes'] += classes
+        if caption_txt := self.options.get('caption'):
+            (
+                inline_nodes,
+                _msgs,
+            ) = self.state.inline_text(
+                caption_txt,
+                self.lineno,
+            )
+            caption = nodes.caption(
+                caption_txt,
+                '',
+                *inline_nodes,
+            )
+            fig += caption
+        self.add_name(fig)
+        return [fig]
+
+
+def _reset_seen(
+    app: Sphinx,
+) -> None:
+    '''
+    Clear the per-build output-collision map at the
+    start of each build.
+
+    '''
+    _seen_outputs.clear()
+
+
+def _cachebust_d2_images(
+    app: Sphinx,
+    pagename: str,
+    templatename: str,
+    context: dict,
+    doctree,
+) -> None:
+    '''
+    Append a ``?v=<content-hash>`` query to every d2
+    diagram ``<img src>`` in the rendered page ``body``
+    so a browser re-fetches an *edited* SVG instead of
+    its stale cached copy at the stable
+    ``_images/<stem>.svg`` url (sphinx cache-busts
+    css/js this way, but not images).
+
+    Scoped strictly to d2 images (those carrying the
+    `d2_cachebust` attr set in `D2Diagram.run()`); all
+    other markup is left untouched.
+
+    '''
+    if doctree is None or 'body' not in context:
+        return
+    busts: dict[str, str] = {}
+    for img in doctree.findall(nodes.image):
+        if ver := img.get('d2_cachebust'):
+            busts[img['d2_stem']] = ver
+    if not busts:
+        return
+    body: str = context['body']
+    for stem, ver in busts.items():
+        body = re.sub(
+            r'(src="[^"]*?' + re.escape(stem) + r'\.svg)(")',
+            rf'\1?v={ver}\2',
+            body,
+        )
+    context['body'] = body
+
+
+def setup(app: Sphinx) -> dict:
+    app.add_config_value('d2_bin', None, 'env')
+    app.add_config_value('d2_args', [], 'env')
+    app.add_directive('d2', D2Diagram)
+    app.connect('builder-inited', _reset_seen)
+    app.connect('html-page-context', _cachebust_d2_images)
+    return {
+        'version': '0.1.0',
+        # NB: run() writes the rendered SVG during the
+        # READ phase; the temp-file + `os.replace` swap
+        # keeps that atomic so concurrent renders of the
+        # same diagram (under `sphinx-build -j`) can't
+        # tear the output file.
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }

docs/_ext/marginalia.py

@@ -0,0 +1,51 @@
+# tractor: distributed structured concurrency.
+'''
+``.. margin::`` - prose-anchored, right-margin asides.
+
+A theme-agnostic vendoring of `sphinx_book_theme`'s
+`Margin` directive: a `docutils` `Sidebar` subclass
+which tags the node with a ``margin`` class; placement
+is then pure CSS (see ``_static/css/custom.css``)
+allowing use on any theme incl. our
+`pydata_sphinx_theme`.
+
+Usage,
+
+.. code:: rst
+
+    .. margin:: An optional title
+
+       Aside content; text, figures, whatever.
+
+'''
+from docutils import nodes
+from docutils.parsers.rst.directives.body import (
+    Sidebar,
+)
+from sphinx.application import Sphinx
+
+
+class Margin(Sidebar):
+    '''
+    Notes/figures placed in the right margin, anchored
+    at the current point in the prose flow.
+
+    '''
+    required_arguments = 0
+    optional_arguments = 1
+
+    def run(self) -> list[nodes.Node]:
+        if not self.arguments:
+            self.arguments = ['']
+        out: list[nodes.Node] = super().run()
+        out[0].attributes['classes'].append('margin')
+        return out
+
+
+def setup(app: Sphinx) -> dict:
+    app.add_directive('margin', Margin)
+    return {
+        'version': '0.1.0',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }

docs/_static/css/custom.css

@@ -0,0 +1,185 @@
+/* tractor docs: a minimal black + white skin over
+ * `pydata-sphinx-theme` plus RHS-marginalia + d2
+ * diagram styling.
+ */
+html[data-theme="light"] {
+  --pst-color-primary: #000000;
+  --pst-color-secondary: #3d3d3d;
+  --pst-color-accent: #5a5a5a;
+  --pst-color-link: #000000;
+  --pst-color-link-hover: #5a5a5a;
+  --pst-color-inline-code: #1a1a1a;
+  --pst-color-inline-code-links: #000000;
+}
+html[data-theme="dark"] {
+  --pst-color-primary: #ffffff;
+  --pst-color-secondary: #c9c9c9;
+  --pst-color-accent: #a8a8a8;
+  --pst-color-link: #ffffff;
+  --pst-color-link-hover: #bdbdbd;
+  --pst-color-inline-code: #e8e8e8;
+  --pst-color-inline-code-links: #ffffff;
+}
+/* mono-chrome links: rely on underline for
+ * affordance instead of color.
+ */
+.bd-content a:not(.headerlink) {
+  text-decoration: underline;
+  text-underline-offset: 0.18em;
+}
+/* d2 diagram figures */
+figure.d2-diagram {
+  text-align: center;
+}
+figure.d2-diagram img {
+  max-width: 100%;
+  height: auto;
+}
+/* keep light-rendered svgs legible in dark mode */
+html[data-theme="dark"] figure.d2-diagram img {
+  background: #ffffff;
+  border-radius: 6px;
+  padding: 6px;
+}
+/* prose-anchored right-margin asides (tufte-ish):
+ * float right within the content column on wide
+ * screens, collapse inline on narrow ones.
+ */
+@media (min-width: 960px) {
+  aside.margin,
+  figure.margin,
+  div.margin,
+  figure.d2-margin {
+    float: right;
+    clear: right;
+    width: 44%;
+    margin: 0.2rem 0 1rem 1.4rem;
+    font-size: 0.85rem;
+  }
+}
+/* strip docutils sidebar chrome from margin asides */
+aside.sidebar.margin {
+  border: none;
+  background: transparent;
+  padding: 0;
+}
+aside.sidebar.margin > p.sidebar-title {
+  font-weight: 600;
+  font-size: 0.9rem;
+  margin-bottom: 0.3rem;
+}
+/* landing-page hero logo (inline svg): the linework uses
+ * `fill: currentColor` so it inherits the theme text colour
+ * (auto-flips light<->dark), and the faces are transparent so
+ * the page background shows through. */
+svg.hero-logo {
+  display: block;
+  max-width: 360px;
+  height: auto;
+  color: var(--pst-color-text-base);
+}
+/* 3-up landing hero row: name | logo | tagline, with a centered
+ * sub-tagline beneath. */
+.hero-row {
+  display: flex;
+  align-items: center;
+  /* left-anchored single row; tighter gap so the logo sits over
+   * the sub-line and the tagline over the prose below it (stack
+   * only on mobile, via the media query). */
+  justify-content: flex-start;
+  flex-wrap: nowrap;
+  gap: clamp(0.5rem, 2vw, 1.5rem);
+  margin: 0 0 0.25rem;
+}
+.hero-row svg.hero-logo {
+  /* override the stacked-hero sizing for the inline row */
+  width: clamp(240px, 34vw, 360px);
+  margin: 0;
+}
+.hero-row .hero-tag {
+  margin: 0;
+  /* keep it on a single line beside the logo */
+  max-width: none;
+  white-space: nowrap;
+  font-size: clamp(1rem, 2.1vw, 1.4rem);
+  font-weight: 400;
+  line-height: 1.15;
+  color: var(--pst-color-text-base);
+}
+.hero-row .hero-tag {
+  min-width: 0;
+}
+.hero-sub {
+  /* wrap at the prose width (not the logo's), with a line of
+   * space before the prose section below. */
+  margin: 0 0 4rem;
+  max-width: none;
+  text-align: left;
+  font-size: 1.05rem;
+  color: var(--pst-color-text-muted);
+}
+/* the page carries a single rst <h1> ("tractor") for semantics
+ * + SEO, but the visual title is the hero — so hide the doc
+ * title accessibly (still read by screen readers + search). */
+#tractor > h1 {
+  position: absolute !important;
+  width: 1px;
+  height: 1px;
+  margin: -1px;
+  padding: 0;
+  overflow: hidden;
+  clip: rect(0 0 0 0);
+  clip-path: inset(50%);
+  white-space: nowrap;
+  border: 0;
+}
+/* smaller section headings on the landing only */
+#sixty-seconds-of-why > :is(h1, h2),
+#dig-in > :is(h1, h2),
+#features > :is(h1, h2),
+#where-do-i-start > :is(h1, h2) {
+  font-size: 1.75rem;
+}
+/* extra breathing room before the first landing section */
+#sixty-seconds-of-why {
+  margin-top: 4rem;
+}
+/* pull the section's `tl;dr` margin-note up so its top edge is
+ * level with the heading (default floats it beside the body). */
+#sixty-seconds-of-why aside.margin {
+  margin-top: -3.75rem;
+}
+/* stack the 3-up hero only on real mobile */
+@media (max-width: 640px) {
+  .hero-row {
+    flex-direction: column;
+  }
+  .hero-row .hero-tag {
+    max-width: none;
+  }
+}
+/* navbar brand: the "distributed SC" tagline next to the logo
+ * (the logo `text` value), kept small + muted like a sub-line. */
+.navbar-brand .title {
+  /* match the centered nav tabs (Bootstrap leaves the nav-link
+   * size/weight vars empty → ~1rem / normal); `inline-block` is
+   * the real underline fix — it stops the parent brand-link's
+   * :hover underline from propagating onto the text (a block
+   * child's `text-decoration:none` can't cancel an ancestor's
+   * underline). */
+  display: inline-block;
+  font-size: 1rem;
+  font-weight: 400;
+  text-decoration: none;
+}
+/* it's a brand mark, not a content link — never underline the
+ * brand text (base / hover / focus). */
+.navbar-brand,
+.navbar-brand:hover,
+.navbar-brand:focus,
+.navbar-brand:visited:hover,
+.navbar-brand .title,
+.navbar-brand:hover .title {
+  text-decoration: none !important;
+  border-bottom: 0 !important;
+}

docs/_static/tractor_hero.html

@@ -0,0 +1,462 @@
+<div class="hero-row">
+  <svg class="hero-logo" role="img" aria-label="tractor" version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 2670 1980" style="enable-background:new 0 0 2670 1980;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:currentColor;}
+	.st1{fill:none;}
+</style>
+<g>
+	<path class="st0" d="M2275.3,1000.1c-0.1,2.3,0,4.7,0,7c0,189.3,0,378.7,0,568c0,6,0.1,12.1-0.8,17.9c-2.4,15.2-12.9,17.4-23.6,10
+		c-45.4-31-91.2-61.4-136.9-91.9l-30.1-20.3c-9.8-6.3-19.2-13.2-29.2-19.3c-6.7-4.1-9.8-9.7-9.9-17.2c-0.1-9.3-0.6-18.7-0.3-28
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+  <p class="hero-tag">distributed structured concurrency</p>
+</div>
+<p class="hero-sub">a multi-processing runtime built on (and shaped
+entirely like) <a class="reference external"
+href="https://github.com/python-trio/trio">trio</a>.</p>

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docs/api/context.rst

@@ -0,0 +1,134 @@
+Contexts and streaming
+======================
+
+The modern core of ``tractor``: a :class:`Context` links a task in
+one actor to a task in another as a *single* structured concurrency
+(SC) scope stretched across the IPC boundary — errors, results and
+cancellation flow between the pair `exactly like trio`_ tasks under
+a common `nursery`_. Open one with ``Portal.open_context()`` (see
+:func:`tractor._context.open_context_from_portal` in
+:doc:`/api/core`), then optionally bridge a bidirectional
+:class:`MsgStream` between the two tasks.
+
+.. d2:: diagrams/context_handshake.d2
+   :caption: The ``open_context()`` <-> ``ctx.started()`` handshake.
+   :margin:
+   :alt: parent and child actor context handshake sequence
+
+For the guided, example-driven tour see :doc:`/guide/context`; this
+page is the precise API surface.
+
+.. currentmodule:: tractor
+
+The ``@context`` decorator
+--------------------------
+
+.. autofunction:: context
+
+.. note::
+
+   The decorated function **must** declare a parameter annotated
+   ``tractor.Context`` (any param name works); the runtime injects
+   the context instance there on each remote invocation. Pass
+   ``pld_spec`` to type-restrict (and validate) the payloads this
+   endpoint may shuttle — violations raise
+   :class:`MsgTypeError`. See ``examples/typed_payloads.py``.
+
+``Context``
+-----------
+
+.. autoclass:: Context
+   :members: started,
+             wait_for_result,
+             cancel,
+             cid,
+             chan,
+             side,
+             cancel_called,
+             cancelled_caught,
+             cancel_acked,
+             canceller,
+             maybe_error,
+             outcome
+
+.. deprecated:: 0.1.0a6
+
+   ``Context.result()`` warns; use :meth:`Context.wait_for_result`.
+
+.. note::
+
+   A :class:`Context` is **not** a :class:`trio.CancelScope`:
+   :meth:`Context.cancel` requests cancellation of the *remote*
+   peer task and does not cancel the local scope. If *you*
+   requested the cancel, the resulting :class:`ContextCancelled`
+   is absorbed at ``open_context()`` exit; a cancel originating
+   anywhere else (the peer, or a third-party actor recorded in
+   :attr:`ContextCancelled.canceller`) *is* raised locally. This
+   self-vs-cross-cancel rule is the key to writing correct
+   inter-actor teardown logic — see :doc:`/guide/context`.
+
+Bidirectional streaming
+-----------------------
+
+.. autofunction:: tractor._streaming.open_stream_from_ctx
+
+.. note::
+
+   :func:`~tractor._streaming.open_stream_from_ctx` is bound as
+   the **method-alias** ``Context.open_stream()`` — call it as
+   ``async with ctx.open_stream() as stream:``. Both sides of the
+   context must enter it for the dialog to be open.
+
+.. autoclass:: MsgStream
+   :members: send,
+             receive,
+             receive_nowait,
+             aclose,
+             subscribe,
+             ctx,
+             closed
+
+.. note::
+
+   A :class:`MsgStream` is one-shot use: once closed it can never
+   be "re-opened" — open a fresh :class:`Context` instead. Remote
+   end-of-stream surfaces as :class:`StopAsyncIteration` from
+   ``async for``; un-consumed sends overrun the receiver and raise
+   :class:`tractor._exceptions.StreamOverrun` unless the context
+   was opened with ``allow_overruns=True``.
+
+:meth:`MsgStream.subscribe` fans a single IPC stream out to
+multiple *local* tasks via a
+:class:`tractor.trionics.BroadcastReceiver` (see
+:doc:`/api/trionics`); the underlying allocation is idempotent and
+non-reversible for the stream's lifetime. See
+``examples/streaming_broadcast_fanout.py`` for the pattern in
+action.
+
+Legacy one-way streaming
+------------------------
+
+.. autofunction:: stream
+
+.. warning::
+
+   ``@tractor.stream`` and ``Portal.open_stream_from()`` are the
+   *legacy* one-way streaming API kept for backward compat: a
+   plain async-generator function streamed parent-ward with no
+   child-side receive leg. New code should use
+   ``@tractor.context`` + ``ctx.open_stream()`` (bidirectional,
+   SC-linked, typed). Note ``ctx`` is now a reserved param name
+   for ``@context`` endpoints — ``@stream`` functions must use
+   ``stream`` instead, and ``ctx.send_yield()`` is deprecated in
+   favor of :meth:`MsgStream.send`.
+
+.. seealso::
+
+   :doc:`/api/errors` for :class:`ContextCancelled` /
+   :class:`MsgTypeError` semantics, :doc:`/api/msg` for payload
+   typing via ``pld_spec`` and codecs, :doc:`/api/trionics` for
+   the broadcast fan-out machinery, and the guided tours in
+   :doc:`/guide/streaming` + :doc:`/guide/cancellation`.
+
+.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
+.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning

docs/api/core.rst

@@ -0,0 +1,157 @@
+Runtime and spawning
+====================
+
+The core lifecycle API: boot the runtime in your root process,
+spawn trio-"actors" (processes running ``trio.run()`` task trees)
+under a one-cancels-all supervisor, and talk to them through
+portals. This is structured concurrency (SC) applied *transitively*:
+every spawned process is owned by a nursery block and errors
+`always propagate`_. If you can create zombies it **is a bug**.
+
+.. currentmodule:: tractor
+
+Booting the runtime
+-------------------
+
+.. autofunction:: open_root_actor
+
+.. note::
+
+   The env vars ``TRACTOR_LOGLEVEL`` and ``TRACTOR_SPAWN_METHOD``
+   override the ``loglevel`` / ``start_method`` params so you can
+   crank verbosity or swap spawn backends without touching app
+   code. Exactly **one** IPC transport may be enabled per actor
+   (see ``enable_transports`` and :doc:`/api/ipc`).
+
+.. autofunction:: run_daemon
+
+Spawning actors
+---------------
+
+.. d2:: diagrams/actor_tree.d2
+   :caption: A supervised actor (process) tree.
+   :margin:
+   :alt: root actor supervising a tree of subactors
+
+.. autofunction:: open_nursery
+
+.. autoclass:: ActorNursery
+   :members: start_actor,
+             run_in_actor,
+             cancel,
+             cancel_called,
+             cancelled_caught
+
+.. note::
+
+   :meth:`ActorNursery.start_actor` (daemon actor + portal) is the
+   blessed spawning primitive; pair it with
+   ``Portal.open_context()`` for SC-linked remote tasks.
+   :meth:`ActorNursery.run_in_actor` is a *convenience* one-shot —
+   spawn, run a single task, auto-cancel after the result — slated
+   to be rebuilt as a high-level wrapper, so don't design around
+   it as the core model.
+
+.. deprecated:: 0.1.0a6
+
+   ``ActorNursery.cancelled`` warns; use
+   :attr:`ActorNursery.cancel_called` and
+   :attr:`ActorNursery.cancelled_caught`. The ``rpc_module_paths``
+   kwarg is likewise deprecated in favor of ``enable_modules``.
+
+Portals
+-------
+
+A :class:`Portal` "opens a portal" into a peer actor's memory
+domain: you call functions and start SC-linked tasks *over IPC* as
+though they were local, with results, errors and cancellation
+flowing back `exactly like trio`_.
+
+.. autoclass:: Portal
+   :members: run,
+             run_from_ns,
+             open_stream_from,
+             wait_for_result,
+             cancel_actor,
+             chan
+
+.. deprecated:: 0.1.0a6
+
+   ``Portal.result()`` warns; use :meth:`Portal.wait_for_result`.
+   The str-form ``Portal.run('mod.path', 'fn_name')`` also warns;
+   pass a function *object* whose module is listed in the target's
+   ``enable_modules``. ``Portal.channel`` is the legacy spelling
+   of :attr:`Portal.chan`.
+
+.. autofunction:: tractor._context.open_context_from_portal
+
+.. note::
+
+   :func:`~tractor._context.open_context_from_portal` is bound as
+   the **method-alias** ``Portal.open_context()`` — that's the
+   spelling you should actually call:
+   ``portal.open_context(fn, **kwargs)``. See :doc:`/api/context`
+   for the full ``Context`` + ``MsgStream`` API it unlocks.
+
+.. note::
+
+   :meth:`Portal.cancel_actor` cancels the *whole* remote runtime
+   and process (machine-level), not a single task — use
+   :meth:`Context.cancel` for task-level cancellation. Pass
+   ``raise_on_timeout=True`` to get an ``ActorTooSlowError`` you
+   can escalate per SC discipline (see :doc:`/api/errors`).
+
+Clusters
+--------
+
+.. autofunction:: open_actor_cluster
+
+Spawn a *flat* cluster of ``count`` worker actors (default: one
+per core) all serving the RPC ``modules`` list, yielding a
+``dict[str, Portal]`` keyed by actor name. Handy for
+embarrassingly parallel fan-out; see ``examples/quick_cluster.py``.
+
+Runtime introspection
+---------------------
+
+.. autofunction:: current_actor
+
+.. autoclass:: Actor
+   :members: aid,
+             name,
+             uid,
+             is_registrar,
+             is_infected_aio,
+             cancel_soon
+
+.. note::
+
+   :class:`Actor` is the per-process runtime singleton (msg loop,
+   RPC scheduling, IPC server) — you never instantiate it yourself
+   and should normally only touch the identity/introspection
+   surface listed above. The canonical identity type is
+   :attr:`Actor.aid` (a ``tractor.msg.Aid`` struct);
+   :attr:`Actor.uid` is the legacy ``(name, uuid)`` 2-tuple which
+   is still pervasive in logs and error metadata.
+
+.. deprecated:: 0.1.0a6
+
+   ``Actor.is_arbiter`` warns; use :attr:`Actor.is_registrar`.
+   The ``arbiter_addr`` constructor kwarg is deprecated for
+   ``registry_addrs``.
+
+.. autofunction:: current_ipc_ctx
+
+.. autofunction:: is_root_process
+
+.. autofunction:: get_runtime_vars
+
+.. seealso::
+
+   :doc:`/api/context` for the SC-linked remote task API,
+   :doc:`/api/discovery` for finding actors by name, and the
+   guided tours in :doc:`/guide/spawning`, :doc:`/guide/rpc` and
+   :doc:`/guide/context`.
+
+.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
+.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics

docs/api/devx.rst

@@ -0,0 +1,92 @@
+Debugging and devx: ``tractor.devx``
+====================================
+
+Multi-process debugging that actually works: boot the tree with
+``open_root_actor(debug_mode=True)`` (or pass it to
+``open_nursery()``) and any crash or explicit pause in *any* actor
+acquires a tree-global TTY lock and drops you into a
+`pdbp`_-powered REPL — one actor at a time, ``SIGINT`` shielded,
+no garbled terminals. The top-level helpers below are the daily
+drivers; the rest of the toolbox lives under ``tractor.devx``.
+
+.. currentmodule:: tractor
+
+Pausing and post-mortems
+------------------------
+
+.. autofunction:: pause
+
+.. autofunction:: pause_from_sync
+
+.. note::
+
+   :func:`pause_from_sync` needs the `greenback`_ portal: boot
+   with ``open_root_actor(maybe_enable_greenback=True)`` (mind
+   the `performance implications`_). With ``debug_mode`` on, the
+   built-in ``breakpoint()`` is also remapped to a
+   ``tractor``-safe equivalent.
+
+.. autofunction:: post_mortem
+
+.. deprecated:: 0.1.0a6
+
+   ``tractor.breakpoint()`` warns and simply calls :func:`pause`
+   — use :func:`tractor.pause` (async) or
+   :func:`tractor.pause_from_sync` in new code.
+
+Crash handling for CLIs and sync entrypoints
+--------------------------------------------
+
+.. currentmodule:: tractor.devx
+
+.. autofunction:: open_crash_handler
+
+.. autofunction:: maybe_open_crash_handler
+
+.. note::
+
+   Both are *sync* context managers usable before (or without)
+   ``trio.run()`` — wrap your CLI ``main()`` to get a post-mortem
+   REPL on any uncaught exception instead of a bare traceback.
+
+Runtime hang-hunting
+--------------------
+
+.. autofunction:: enable_stack_on_sig
+
+With stackscope_ integration enabled (also via
+``open_root_actor(enable_stack_on_sig=True)`` or the
+``TRACTOR_ENABLE_STACKSCOPE`` env var) a ``SIGUSR1`` triggers a
+full trio task-tree dump from every actor — works on live,
+*non*-debug-mode trees too:
+
+.. code:: sh
+
+   pkill --signal SIGUSR1 -f <part-of-your-cmd>
+
+Dumps also tee to ``/tmp/tractor-stackscope-<pid>.log`` so you
+still get output under captured/CI stdio.
+
+Lower-level debug plumbing
+--------------------------
+
+.. autofunction:: mk_pdb
+
+.. autofunction:: maybe_wait_for_debugger
+
+:func:`maybe_wait_for_debugger` is mainly useful in runtime/test
+code that must avoid tearing down a tree while a child still
+holds the global debug lock.
+
+.. seealso::
+
+   :doc:`/api/errors` for the boxed error types you'll inspect
+   from the REPL, :doc:`/api/core` for the ``debug_mode`` /
+   ``maybe_enable_greenback`` / ``enable_stack_on_sig`` boot
+   flags on :func:`tractor.open_root_actor`, and
+   :doc:`/guide/debugging` for the guided multi-actor REPL tour.
+
+.. _pdbp: https://github.com/mdmintz/pdbp
+.. _greenback: https://greenback.readthedocs.io/en/latest/
+.. _performance implications: https://greenback.readthedocs.io/en/latest/principle.html#performance
+.. _stackscope: https://github.com/oremanj/stackscope

docs/api/discovery.rst

@@ -0,0 +1,67 @@
+Discovery and the registrar
+===========================
+
+Every actor registers its ``(name, uuid)`` and transport addresses
+with a *registrar* actor — by default the root of the tree, or
+whichever actor serves at the ``registry_addrs`` you boot with.
+The discovery API lets any actor look up any other **by name** and
+get back a connected :class:`~tractor.Portal`, giving you
+service-discovery patterns (daemons, service trees, multi-host
+meshes) without hard-coding addresses.
+
+Lookups first scan already-connected peers before RPC-ing the
+registrar, and multihomed results are ranked UDS > local TCP >
+remote TCP. See ``examples/service_daemon_discovery.py`` for the
+canonical daemon + lookup pattern.
+
+.. currentmodule:: tractor
+
+Lookup APIs
+-----------
+
+.. autofunction:: find_actor
+
+.. autofunction:: wait_for_actor
+
+.. autofunction:: query_actor
+
+.. autofunction:: get_registry
+
+.. note::
+
+   :func:`find_actor` yields ``None`` when nothing is registered
+   under the name (or raises with ``raise_on_none=True``);
+   :func:`wait_for_actor` blocks until the name appears;
+   :func:`query_actor` only *looks up* the address without
+   connecting to the target.
+
+The ``Registrar``
+-----------------
+
+.. autoclass:: Registrar
+   :show-inheritance:
+
+A :class:`Registrar` is just an :class:`~tractor.Actor` subtype
+maintaining the name -> addresses table; you rarely touch it
+directly beyond passing ``registry_addrs`` /
+``ensure_registry=True`` to :func:`~tractor.open_root_actor`.
+Check :attr:`Actor.is_registrar <tractor.Actor.is_registrar>` to
+ask "am I it?".
+
+Legacy ``Arbiter`` alias
+------------------------
+
+.. deprecated:: 0.1.0a6
+
+   ``tractor.Arbiter`` survives only as a class alias of
+   :class:`Registrar` and all "arbiter" terminology is replaced
+   by "registrar"/"registry" across the API: ``get_arbiter()`` is
+   removed (use :func:`get_registry`) and the ``arbiter_addr``
+   kwarg is replaced by ``registry_addrs``.
+
+.. seealso::
+
+   :doc:`/api/core` for booting a registrar via
+   ``open_root_actor(registry_addrs=...)``, :doc:`/api/ipc` for
+   the transport/address model the registry stores, and
+   :doc:`/guide/discovery` for the worked walkthrough.

docs/api/errors.rst

@@ -0,0 +1,102 @@
+Errors and cancellation types
+=============================
+
+``tractor`` extends trio's "exceptions `always propagate`_" rule
+across the process boundary: a crash in any actor is serialized as
+an ``Error`` msg, shuttled over IPC, and re-raised in the linked
+parent scope as a *boxed* :class:`RemoteActorError` — preserving
+the original type, traceback text and source-actor identity, even
+across multi-hop relays (a.k.a. "inceptions").
+
+The most-used types below are importable from ``tractor``
+directly; the remainder live in ``tractor._exceptions`` (not yet
+re-exported at top level).
+
+.. currentmodule:: tractor
+
+Boxed remote errors
+-------------------
+
+.. autoexception:: RemoteActorError
+   :members: boxed_type,
+             src_uid,
+             relay_uid,
+             pformat
+
+.. code:: python
+
+   try:
+       async with portal.open_context(ep_fn) as (ctx, first):
+           ...
+   except tractor.RemoteActorError as rae:
+       if rae.boxed_type is ValueError:
+           ...  # remote task raised a `ValueError`
+
+.. autoexception:: ContextCancelled
+   :show-inheritance:
+   :members: canceller
+
+.. note::
+
+   Inspect :attr:`ContextCancelled.canceller` (the requesting
+   actor's uid) to distinguish a *self*-requested cancel (absorbed
+   at ``open_context()`` exit) from a *cross*-actor cancel (raised
+   locally) — the full rules live in :doc:`/api/context`.
+
+Typed-messaging errors
+----------------------
+
+.. autoexception:: MsgTypeError
+   :show-inheritance:
+   :members: bad_msg,
+             expected_msg_type
+
+An "IPC ``TypeError``": a message failed validation against the
+active msg-spec / ``pld_spec`` (see :doc:`/api/msg`). Raised
+sender-side for control msgs (``Started``/``Return``) and
+receiver-side for stream ``Yield`` payloads.
+
+.. autoexception:: tractor._exceptions.StreamOverrun
+   :show-inheritance:
+
+The sender out-paced the receiver's buffer on a
+:class:`~tractor.MsgStream` opened without
+``allow_overruns=True``; subtypes :class:`trio.TooSlowError`.
+
+Transport and runtime errors
+----------------------------
+
+.. autoexception:: TransportClosed
+
+.. autoexception:: ModuleNotExposed
+   :show-inheritance:
+
+Raised when an RPC requests a function from a module not listed
+in the target actor's ``enable_modules`` allowlist —
+capability-style access control, not an import bug on your end ;)
+
+.. autoexception:: tractor._exceptions.NoRuntime
+   :show-inheritance:
+
+Raised by :func:`tractor.current_actor` (and friends) when no
+actor runtime is up in the current process.
+
+.. autoexception:: tractor._exceptions.ActorTooSlowError
+   :show-inheritance:
+
+A peer actor failed to ack a cancel request within the bounded
+wait — the SC-sanctioned escalation signal from APIs like
+``Portal.cancel_actor(raise_on_timeout=True)``. Catch it to
+escalate (e.g. hard-kill via the supervising
+:class:`~tractor.ActorNursery`); never just ignore it, that's how
+zombies happen.
+
+.. seealso::
+
+   :doc:`/api/context` for how cancellation and errors flow
+   through a :class:`~tractor.Context`, :doc:`/api/devx` for
+   crash-handling REPL tooling (``debug_mode``, post-mortems),
+   and :doc:`/guide/cancellation` for the full SC-cancellation
+   story.
+
+.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate

docs/api/index.rst

@@ -0,0 +1,67 @@
+API reference
+=============
+
+This is the curated reference for ``tractor``'s public surface: the
+names you can import and lean on without reading runtime internals.
+Everything below is re-exported at the top level (``import
+tractor``) unless a page says otherwise; subsystems like
+``tractor.msg``, ``tractor.trionics``, ``tractor.to_asyncio``,
+``tractor.devx`` and ``tractor.log`` are importable as submodules.
+
+``tractor`` is "just trio_" extended across processes: every API
+here is designed to keep the structured concurrency (SC) rules you
+already know from the `trio docs`_ intact across the process
+boundary. If a name isn't documented here it's an internal — expect
+it to change without notice B).
+
+.. currentmodule:: tractor
+
+Most-used names at a glance:
+
+.. autosummary::
+   :nosignatures:
+
+   open_root_actor
+   open_nursery
+   run_daemon
+   ActorNursery
+   Portal
+   context
+   Context
+   MsgStream
+   open_actor_cluster
+   find_actor
+   wait_for_actor
+   get_registry
+   current_actor
+   current_ipc_ctx
+   is_root_process
+   get_runtime_vars
+   RemoteActorError
+   ContextCancelled
+   MsgTypeError
+   pause
+   post_mortem
+   Channel
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Reference pages
+
+   core
+   context
+   discovery
+   errors
+   msg
+   trionics
+   to_asyncio
+   devx
+   ipc
+
+Where to next? If you're new, start with the runtime and spawning
+APIs in :doc:`/api/core`, then graduate to the inter-actor task
+linking model in :doc:`/api/context` — it's the heart of the whole
+system.
+
+.. _trio: https://github.com/python-trio/trio
+.. _trio docs: https://trio.readthedocs.io/en/latest/

docs/api/ipc.rst

@@ -0,0 +1,89 @@
+IPC and logging
+===============
+
+Under every portal, context and stream sits a per-peer
+:class:`~tractor.Channel`: a msgpack-typed messaging link wrapping
+one OS transport connection. Transports are pluggable per actor
+via ``enable_transports=['tcp' | 'uds']`` — TCP is the default,
+UDS (unix domain sockets) gives you port-less, same-host IPC with
+kernel-provided peer credentials for free — and exactly **one**
+transport may currently be enabled per actor.
+
+.. d2:: diagrams/runtime_stack.d2
+   :caption: Where ``Channel`` sits in the runtime stack.
+   :margin:
+   :alt: layered runtime stack from app code down to transports
+
+Addresses are "unwrapped" tuples at the API edges:
+``('host', port)`` for TCP, filesystem-path pairs for UDS. For
+the full layering story — transport protocols, the IPC server,
+address types and the msg loop — see
+:doc:`/explain/architecture`.
+
+.. currentmodule:: tractor
+
+``Channel``
+-----------
+
+.. autoclass:: Channel
+   :members: from_addr,
+             send,
+             recv,
+             aclose,
+             connected,
+             apply_codec,
+             aid,
+             laddr,
+             raddr,
+             closed
+
+.. deprecated:: 0.1.0a6
+
+   ``Channel.uid`` warns; use :attr:`Channel.aid` which carries
+   richer (optional) identity fields beyond the legacy
+   ``(name, uuid)`` pair.
+
+.. note::
+
+   You rarely construct a :class:`Channel` yourself — the runtime
+   hands them out via :attr:`Portal.chan <tractor.Portal.chan>`
+   and :attr:`Context.chan <tractor.Context.chan>`. Treat the
+   send/recv surface as advanced API: normal apps should speak
+   :class:`~tractor.MsgStream` instead.
+
+Choosing a transport
+--------------------
+
+.. literalinclude:: ../../examples/uds_transport_actor_tree.py
+   :caption: examples/uds_transport_actor_tree.py
+   :language: python
+
+Logging
+-------
+
+``tractor.log`` provides the structured, colorized console
+logging used across the runtime — with actor-name + task-aware
+record headers and extra log levels below :data:`logging.DEBUG`
+(``'transport'``, ``'runtime'``, ``'cancel'``, ``'devx'``) for
+spelunking the runtime itself. Use it for your app too: it's
+already distributed-system aware.
+
+.. currentmodule:: tractor.log
+
+.. autofunction:: get_logger
+
+.. autofunction:: get_console_log
+
+.. note::
+
+   The ``TRACTOR_LOGLEVEL`` env var overrides any caller-passed
+   ``loglevel`` (e.g. to ``open_root_actor()``) so you can crank
+   console verbosity without touching code; subactors inherit
+   the root's level by default.
+
+.. seealso::
+
+   :doc:`/explain/architecture` for the transport/server
+   internals, :doc:`/api/discovery` for how channel addresses
+   get registered and found, and :doc:`/api/msg` for the codec
+   layer every channel speaks.

docs/api/msg.rst

@@ -0,0 +1,107 @@
+Typed messaging: ``tractor.msg``
+================================
+
+All inter-actor communication rides a small, strictly-typed
+msgpack wire protocol built from :class:`msgspec.Struct` types —
+the "SC-shuttle" protocol that powers contexts, streams, RPC and
+cancellation. You normally never touch these msg types directly
+(the :class:`~tractor.Context` API speaks them for you) but you
+*do* use this subpackage to define **payload type contracts**: per
+endpoint via ``@tractor.context(pld_spec=...)`` or per channel via
+custom codecs.
+
+Violations of an active msg-spec surface as
+:class:`~tractor.MsgTypeError` (see :doc:`/api/errors`); the full
+typed-payload workflow is shown in ``examples/typed_payloads.py``.
+
+.. currentmodule:: tractor.msg
+
+The protocol message set
+------------------------
+
+.. autosummary::
+   :nosignatures:
+
+   PayloadMsg
+   Aid
+   SpawnSpec
+   Start
+   StartAck
+   Started
+   Yield
+   Stop
+   Return
+   CancelAck
+   Error
+
+``Aid`` (identity handshake) and ``SpawnSpec`` (parent -> child
+init) run at connection setup; ``Start``/``StartAck`` initiate an
+RPC task; ``Started``/``Yield``/``Stop``/``Return`` are the
+:class:`~tractor.Context` dialog phases; ``CancelAck`` and
+``Error`` close the loop on cancellation and (boxed) failure.
+``Msg`` is a legacy alias of ``PayloadMsg``. The union of all of
+the above is exported as ``MsgType`` (also ``__msg_spec__``).
+
+.. automodule:: tractor.msg.types
+   :no-members:
+
+.. currentmodule:: tractor.msg
+
+Codec construction and override
+-------------------------------
+
+.. autofunction:: mk_codec
+
+.. autoclass:: MsgCodec
+   :members: encode,
+             decode,
+             msg_spec
+
+.. autofunction:: mk_dec
+
+.. autoclass:: MsgDec
+   :members: decode,
+             spec
+
+.. autofunction:: apply_codec
+
+.. autofunction:: current_codec
+
+.. note::
+
+   :func:`apply_codec` swaps the codec via a
+   :class:`contextvars.ContextVar` — the override only applies to
+   the *current task* (and tasks it starts), not sibling tasks
+   already running in the actor. Payload-decoding is layered: the
+   outer codec leaves ``.pld`` fields as ``msgspec.Raw`` and each
+   context's payload-receiver decodes them against *its* spec
+   (the "cheap-or-nasty" validation pattern).
+
+Namespace pointers
+------------------
+
+.. autoclass:: NamespacePath
+   :members: from_ref,
+             load_ref,
+             to_tuple
+
+The ``'module.path:obj_name'`` :class:`str`-subtype used to
+address every RPC target function over the wire (same format as
+:func:`pkgutil.resolve_name`).
+
+Pretty structs
+--------------
+
+.. autoclass:: Struct
+   :show-inheritance:
+
+A :class:`msgspec.Struct` subtype with a multi-line pretty
+``__repr__`` — handy as a base for your own IPC payload types so
+crash logs stay readable.
+
+.. seealso::
+
+   :doc:`/api/context` for where ``pld_spec`` typing plugs into
+   the ``@context`` decorator, :doc:`/api/errors` for
+   :class:`~tractor.MsgTypeError` semantics, and
+   :doc:`/guide/msging` for the guided typed-messaging tour.

docs/api/to_asyncio.rst

@@ -0,0 +1,97 @@
+asyncio interop: ``tractor.to_asyncio``
+=======================================
+
+"Infected asyncio" mode: spawn an actor with
+``start_actor(..., infect_asyncio=True)`` and its process runs
+:mod:`trio` as a `guest`_ on top of the :mod:`asyncio` loop —
+letting your trio task tree drive asyncio tasks *in the same
+process* while the rest of the actor tree stays pure trio. Each
+trio <-> asyncio task pair is linked with structured concurrency
+(SC) semantics: error or cancellation on either side tears down
+both, with the cause translated cross-loop.
+
+.. d2:: diagrams/infected_aio.d2
+   :caption: A trio guest driving asyncio tasks in one actor.
+   :margin:
+   :alt: trio guest mode inside an asyncio-infected actor
+
+See ``examples/infected_asyncio_echo_server.py`` for a complete
+worked example.
+
+.. currentmodule:: tractor.to_asyncio
+
+Starting asyncio tasks from trio
+--------------------------------
+
+.. autofunction:: open_channel_from
+
+.. autofunction:: run_task
+
+.. note::
+
+   :func:`open_channel_from` mirrors the
+   ``Portal.open_context()`` handshake: the asyncio side calls
+   ``chan.started_nowait(value)`` and that value pops out as
+   ``first`` on the trio side. :func:`run_task` is the one-shot
+   form — run a single asyncio-compatible coroutine fn and return
+   its result to trio.
+
+The inter-loop channel
+----------------------
+
+.. autoclass:: LinkedTaskChannel
+   :members: send,
+             receive,
+             wait_for_result,
+             subscribe,
+             started_nowait,
+             send_nowait,
+             get,
+             cancel_asyncio_task,
+             closed
+
+.. note::
+
+   The trio side uses the async API
+   (:meth:`LinkedTaskChannel.send` /
+   :meth:`LinkedTaskChannel.receive`); the asyncio side uses the
+   loop-safe sync/await mix
+   (:meth:`LinkedTaskChannel.send_nowait` /
+   :meth:`LinkedTaskChannel.get` /
+   :meth:`LinkedTaskChannel.started_nowait`).
+
+Translated exception types
+--------------------------
+
+Cross-loop failures are re-raised on the *other* side as one of
+these explicit translation types, so you always know which loop
+actually died first:
+
+.. autoexception:: tractor._exceptions.AsyncioCancelled
+
+.. autoexception:: tractor._exceptions.AsyncioTaskExited
+
+.. autoexception:: tractor._exceptions.TrioCancelled
+
+.. autoexception:: tractor._exceptions.TrioTaskExited
+
+.. autoexception:: AsyncioRuntimeTranslationError
+   :show-inheritance:
+
+Guest-mode entrypoint
+---------------------
+
+``run_as_asyncio_guest()`` is the runtime-internal entrypoint that
+boots trio in `guest`_ mode inside an infected actor — you get it
+implicitly via ``infect_asyncio=True`` and shouldn't need to call
+it yourself.
+
+.. seealso::
+
+   :doc:`/api/core` for the ``infect_asyncio`` spawn flag,
+   :meth:`tractor.Actor.is_infected_aio` for runtime
+   introspection, :doc:`/api/devx` for using the debugger from
+   inside asyncio tasks, and :doc:`/guide/asyncio` for the
+   guided tour.
+
+.. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops

docs/api/trionics.rst

@@ -0,0 +1,76 @@
+Trio patterns: ``tractor.trionics``
+===================================
+
+Sugary structured concurrency (SC) patterns for plain :mod:`trio`
+code — **no actor runtime required**. These helpers grew out of
+real distributed-system needs in ``tractor`` apps but every one of
+them works in a single-process program too; import via
+``from tractor import trionics``.
+
+.. currentmodule:: tractor.trionics
+
+Context-manager helpers
+-----------------------
+
+.. autofunction:: gather_contexts
+
+.. autofunction:: maybe_open_context
+
+.. autofunction:: maybe_open_nursery
+
+.. note::
+
+   :func:`gather_contexts` is "a nursery for async context
+   managers": it enters N acms concurrently and yields their
+   values in input order. :func:`maybe_open_context` is the
+   actor-wide cache/multiplex layer on top — the first task pays
+   the acm setup cost, later callers get ``(cache_hit=True, ...)``
+   and share the same value until all users exit.
+
+Broadcast fan-out
+-----------------
+
+.. autofunction:: broadcast_receiver
+
+.. autoclass:: BroadcastReceiver
+   :members: receive,
+             subscribe,
+             aclose
+
+.. autoexception:: Lagged
+   :show-inheritance:
+
+A single-producer, many-consumer broadcast layer over any
+``trio``-style receive channel: non-lossy for the *fastest*
+consumer while slower consumers raise :class:`Lagged` (a
+:class:`trio.TooSlowError` subtype) once they fall behind the
+internal ring. This is exactly the machinery behind
+:meth:`tractor.MsgStream.subscribe` — see
+``examples/streaming_broadcast_fanout.py``.
+
+ExceptionGroup helpers
+----------------------
+
+.. autofunction:: collapse_eg
+
+.. autofunction:: maybe_raise_from_masking_exc
+
+.. note::
+
+   :func:`collapse_eg` "un-nests" single-exception
+   :class:`ExceptionGroup` wrappers from strict-eg ``trio``
+   nurseries so your ``except`` clauses match the original error;
+   :func:`maybe_raise_from_masking_exc` surfaces real errors that
+   would otherwise be masked by :class:`trio.Cancelled` during
+   teardown.
+
+.. seealso::
+
+   :doc:`/api/context` for the IPC-stream consumer of
+   :class:`BroadcastReceiver`, :doc:`/guide/streaming` for
+   fan-out in a worked pipeline, and the `trio docs`_ for the
+   underlying channel and `nursery`_ semantics these helpers
+   compose.
+
+.. _trio docs: https://trio.readthedocs.io/en/latest/
+.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning

docs/conf.py

@@ -1,105 +1,160 @@
-# Configuration file for the Sphinx documentation builder.
-#
-# This file only contains a selection of the most common options. For a full
-# list see the documentation:
-# https://www.sphinx-doc.org/en/master/usage/configuration.html
+# tractor: distributed structured concurrency.
+'''
+Sphinx config for `tractor`'s documentation.
 
-# -- Path setup --------------------------------------------------------------
+Theme-wise we ride the `pydata_sphinx_theme` (per the
+research + history in #157) skinned to a minimal
+black + white look via `_static/css/custom.css`; see
+the local extensions under `_ext/` for our `.. d2::`
+diagram and `.. margin::` aside directives.
 
-# If extensions (or modules to document with autodoc) are in another directory,
-# add these directories to sys.path here. If the directory is relative to the
-# documentation root, use os.path.abspath to make it absolute, like shown here.
-#
-# import os
-# import sys
-# sys.path.insert(0, os.path.abspath('.'))
+Build locally via,
 
-# Warn about all references to unknown targets
-nitpicky = True
+    uv run --group docs make -C docs html
 
-# The master toctree document.
-master_doc = 'index'
+'''
+from importlib.metadata import version as get_version
+from pathlib import Path
+import sys
 
-# -- Project information -----------------------------------------------------
+# local sphinx extensions live in `_ext/`:
+# - `d2diagrams`: `.. d2::` diagram rendering
+# - `marginalia`: `.. margin::` RHS prose-asides
+sys.path.insert(
+    0,
+    str((Path(__file__).parent / '_ext').resolve()),
+)
+
+# -- project info ---------------------------------
 
 project = 'tractor'
-copyright = '2018, Tyler Goodlet'
+copyright = '2018-2026, Tyler Goodlet'
 author = 'Tyler Goodlet'
+release: str = get_version('tractor')
+version: str = release
 
-# The full version, including alpha/beta/rc tags
-release = '0.0.0a0.dev0'
+# -- general config -------------------------------
 
-# -- General configuration ---------------------------------------------------
-
-# Add any Sphinx extension module names here, as strings. They can be
-# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
-# ones.
 extensions = [
     'sphinx.ext.autodoc',
+    'sphinx.ext.autosummary',
     'sphinx.ext.intersphinx',
+    'sphinx.ext.viewcode',
     'sphinx.ext.todo',
+    # emit a `.nojekyll` so GitHub Pages serves the `_static/`
+    # + `_images/` dirs (Jekyll would otherwise drop `_`-prefixed
+    # paths and break all styling/assets).
+    'sphinx.ext.githubpages',
+    'sphinx_design',
+    'sphinx_copybutton',
+    'sphinxext.opengraph',
+    'sphinx_togglebutton',
+    'd2diagrams',
+    'marginalia',
 ]
-
-# Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
+exclude_patterns = [
+    '_build',
+    # the pypi/gh readme + its standalone generator
+    # sub-project; NOT doc-tree pages.
+    'README.rst',
+    'github_readme',
+    'Thumbs.db',
+    '.DS_Store',
+]
+root_doc = 'index'
+# TODO: flip this on + burn down the (many) warnings
+# from our informal docstring style; see the autodoc
+# readiness notes from the revamp's recon pass.
+nitpicky = False
 
-# List of patterns, relative to source directory, that match files and
-# directories to ignore when looking for source files.
-# This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+# -- autodoc/autosummary --------------------------
 
+autodoc_member_order = 'bysource'
+autodoc_typehints = 'description'
+autosummary_generate = True
 
-# -- Options for HTML output -------------------------------------------------
+# -- intersphinx ----------------------------------
 
-# The theme to use for HTML and HTML Help pages.  See the documentation for
-# a list of builtin themes.
-#
-html_theme = 'sphinx_book_theme'
-
-pygments_style = 'algol_nu'
-
-# Theme options are theme-specific and customize the look and feel of a theme
-# further.  For a list of options available for each theme, see the
-# documentation.
-html_theme_options = {
-    # 'logo': 'tractor_logo_side.svg',
-    # 'description': 'Structured concurrent "actors"',
-    "repository_url": "https://github.com/goodboy/tractor",
-    "use_repository_button": True,
-    "home_page_in_toc": False,
-    "show_toc_level": 1,
-    "path_to_docs": "docs",
-
-}
-html_sidebars = {
-    "**": [
-        "sbt-sidebar-nav.html",
-        # "sidebar-search-bs.html",
-        # 'localtoc.html',
-    ],
-    #     'logo.html',
-    #     'github.html',
-    #     'relations.html',
-    #     'searchbox.html'
-    # ]
+intersphinx_mapping = {
+    'python': (
+        'https://docs.python.org/3',
+        None,
+    ),
+    'trio': (
+        'https://trio.readthedocs.io/en/stable',
+        None,
+    ),
+    # NOTE, msgspec's site doesn't publish an
+    # `objects.inv` (404s) so no intersphinx for it.
+    'pytest': (
+        'https://docs.pytest.org/en/stable',
+        None,
+    ),
 }
 
-# doesn't seem to work?
-# extra_navbar = "<p>nextttt-gennnnn</p>"
+# -- html output ----------------------------------
 
-html_title = ''
+html_theme = 'pydata_sphinx_theme'
+html_title = 'tractor'
+# canonical site root (GitHub Pages); drives <link rel=canonical>,
+# og:url + any future sitemap. Update if a custom domain is added.
+html_baseurl = 'https://goodboy.github.io/tractor/'
 html_logo = '_static/tractor_logo_side.svg'
 html_favicon = '_static/tractor_logo_side.svg'
-# show_navbar_depth = 1
-
-# Add any paths that contain custom static files (such as style sheets) here,
-# relative to this directory. They are copied after the builtin static files,
-# so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
-
-# Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {
-    "python": ("https://docs.python.org/3", None),
-    "pytest": ("https://docs.pytest.org/en/latest", None),
-    "setuptools": ("https://setuptools.readthedocs.io/en/latest", None),
+html_css_files = ['css/custom.css']
+html_show_sourcelink = False
+html_theme_options = {
+    # theme-adaptive navbar logo: faces transparent, linework
+    # near-black on light / near-white on dark (pydata swaps by
+    # the active theme). Matches the landing hero's wireframe.
+    'logo': {
+        'image_light': '_static/tractor_logo_nav_light.svg',
+        'image_dark': '_static/tractor_logo_nav_dark.svg',
+        'alt_text': 'tractor',
+        # text shown to the right of the navbar logo (à la
+        # polars).
+        'text': 'tractor',
+    },
+    'github_url': 'https://github.com/goodboy/tractor',
+    'navbar_align': 'content',
+    'show_toc_level': 2,
+    'secondary_sidebar_items': {
+        '**': ['page-toc'],
+        'index': [],
+    },
+    'use_edit_page_button': True,
+    'footer_start': ['copyright'],
+    'footer_end': ['theme-version'],
+    'pygments_light_style': 'algol_nu',
+    'pygments_dark_style': 'github-dark',
 }
+html_context = {
+    'github_user': 'goodboy',
+    'github_repo': 'tractor',
+    'github_version': 'main',
+    'doc_path': 'docs',
+}
+
+# -- ext: opengraph -------------------------------
+
+ogp_site_url = 'https://goodboy.github.io/tractor/'
+ogp_use_first_image = True
+
+# -- ext: copybutton ------------------------------
+
+copybutton_prompt_text = r'>>> |\.\.\. |\$ '
+copybutton_prompt_is_regexp = True
+
+# -- ext: todo ------------------------------------
+
+todo_include_todos = True
+
+# -- ext: d2diagrams (local) ----------------------
+
+# normally resolved from PATH or the `D2_BIN` env
+# var; when neither hits, the committed SVGs under
+# `_diagrams/` are used as-is.
+d2_bin = None
+d2_args = []

docs/dev_tips.rst

@@ -1,51 +0,0 @@
-Hot tips for ``tractor`` hackers
-================================
-
-This is a WIP guide for newcomers to the project mostly to do with
-dev, testing, CI and release gotchas, reminders and best practises.
-
-``tractor`` is a fairly novel project compared to most since it is
-effectively a new way of doing distributed computing in Python and is
-much closer to working with an "application level runtime" (like erlang
-OTP or scala's akka project) then it is a traditional Python library.
-As such, having an arsenal of tools and recipes for figuring out the
-right way to debug problems when they do arise is somewhat of
-a necessity.
-
-
-Making a Release
-----------------
-We currently do nothing special here except the traditional
-PyPa release recipe as in `documented by twine`_. I personally
-create sub-dirs within the generated `dist/` with an explicit
-release name such as `alpha3/` when there's been a sequence of
-releases I've made, but it really is up to you how you like to
-organize generated sdists locally.
-
-The resulting build cmds are approximately:
-
-.. code:: bash
-
-    python setup.py sdist -d ./dist/XXX.X/
-
-    twine upload -r testpypi dist/XXX.X/*
-
-    twine upload dist/XXX.X/*
-
-
-
-.. _documented by twine: https://twine.readthedocs.io/en/latest/#using-twine
-
-
-Debugging and monitoring actor trees
-------------------------------------
-TODO: but there are tips in the readme for some terminal commands
-which can be used to see the process trees easily on Linux.
-
-
-Using the log system to trace `trio` task flow
-----------------------------------------------
-TODO: the logging system is meant to be oriented around
-stack "layers" of the runtime such that you can track
-"logical abstraction layers" in the code such as errors, cancellation,
-IPC and streaming, and the low level transport and wire protocols.

docs/diagrams/actor_tree.d2

@@ -0,0 +1,31 @@
+# tractor docs diagram: the hero supervision tree.
+# A process tree of trio-task-trees; every arrow is
+# a parent which *must wait* on its children.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+direction: down
+root: "root actor" {
+  main: "main()"
+  an: "ActorNursery"
+  main -> an: opens
+}
+w0: "subactor\n'worker_0'" {
+  tasks: "trio task tree"
+}
+w1: "subactor\n'worker_1'" {
+  main: "serve()"
+  an: "ActorNursery"
+  main -> an: opens
+}
+gc: "subactor\n'deeper'" {
+  tasks: "trio task tree"
+}
+root.an -> w0: "spawns +\nsupervises"
+root.an -> w1: "spawns +\nsupervises"
+w1.an -> gc: "spawns +\nsupervises"

docs/diagrams/context_handshake.d2

@@ -0,0 +1,33 @@
+# tractor docs diagram: the inter-actor `Context`
+# dialog; tractor's SC-transitive msg protocol as
+# seen from both sides of `Portal.open_context()`.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+shape: sequence_diagram
+parent: "parent task\n(Portal)"
+child: "child actor task\n(@tractor.context fn)"
+parent -> child: "Start: open_context(fn, **kwargs)"
+child -> parent: "StartAck"
+child -> parent: "Started: await ctx.started(value)"
+parent -> child: "Yield: stream.send()"
+child -> parent: "Yield: stream.send()"
+parent -> child: "Stop: stream closed"
+child -> parent: "Return: fn return value"
+# the non-graceful endings: errors/cancels always
+# propagate, both ways (`ContextCancelled` rides in
+# an `Error` msg, hence the `Error: ...` labels).
+"... or, instead of a graceful Return": {
+  parent-initiated: {
+    parent -> child: "ctx.cancel()  |  parent-side error"
+    child -> parent: "Error: ContextCancelled"
+  }
+  child-initiated: {
+    child -> parent: "Error: child raised  |  ContextCancelled"
+  }
+}

docs/diagrams/debug_lock.d2

@@ -0,0 +1,19 @@
+# tractor docs diagram: multi-actor debugger REPL
+# serialization via the root actor's tty lock.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+shape: sequence_diagram
+mary: "subactor 'mary'"
+root: "root actor\n(owns the tty)"
+bob: "subactor 'bob'"
+mary -> root: "tractor.pause(): acquire tty lock"
+root -> mary: "granted: pdb REPL is yours"
+bob -> root: "tractor.pause(): acquire tty lock"
+mary -> root: "continue: release lock"
+root -> bob: "granted: pdb REPL is yours"

docs/diagrams/error_propagation.d2

@@ -0,0 +1,27 @@
+# tractor docs diagram: one-cancels-all error
+# propagation up a (sub-)actor tree; no zombies,
+# no lost errors.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+direction: down
+root: "root actor\n(ActorNursery)"
+gertie: "subactor 'gertie'\n(healthy, gets cancelled)"
+bobbie: "subactor 'bobbie'\nraises NameError"
+root -> gertie: supervises
+root -> bobbie: supervises
+bobbie -> root: "RemoteActorError\n(boxed NameError)" {
+  style: {
+    stroke-dash: 3
+  }
+}
+root -> gertie: "cancel()" {
+  style: {
+    stroke-dash: 3
+  }
+}

docs/diagrams/infected_aio.d2

@@ -0,0 +1,23 @@
+# tractor docs diagram: "infected asyncio" mode;
+# trio runs as a guest on the asyncio loop with
+# SC supervision linking tasks across both.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+direction: down
+sub: "subactor process (infect_asyncio=True)" {
+  aio: "asyncio event loop" {
+    aiotask: "asyncio.Task\naio_echo_server()"
+    trio: "trio (guest mode)" {
+      triotask: "trio task\n@tractor.context fn"
+    }
+    trio.triotask <-> aiotask: "LinkedTaskChannel\n.send()/.receive()"
+  }
+}
+parent: "parent actor (pure trio)"
+parent <-> sub.aio.trio.triotask: "IPC: Context + MsgStream"

docs/diagrams/runtime_stack.d2

@@ -0,0 +1,16 @@
+# tractor docs diagram: the layered runtime view
+# inside any single actor process.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+grid-rows: 4
+grid-gap: 0
+app: "your app: plain trio tasks + nurseries"
+tractor: "tractor runtime: actors, portals,\ncontexts + streams, RPC"
+ipc: "IPC Channel: msgspec-typed msgs\nover TCP | UDS transports"
+os: "OS: one process per actor"

docs/diagrams/streaming_pipeline.d2

@@ -0,0 +1,27 @@
+# tractor docs diagram: multi-actor streaming
+# pipeline topology from
+# examples/full_fledged_streaming_service.py
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+direction: right
+s0: "actor 'streamer_0'" {
+  fn: "stream_data(0)"
+}
+s1: "actor 'streamer_1'" {
+  fn: "stream_data(1)"
+}
+agg: "actor 'aggregator'" {
+  fn: "aggregate()"
+}
+main: "root actor" {
+  fn: "main()"
+}
+s0 -> agg: "async for:\nyielded ints"
+s1 -> agg: "async for:\nyielded ints"
+agg -> main: "deduped\nstream"

docs/explain/architecture.rst

@@ -0,0 +1,369 @@
+Anatomy of the runtime
+======================
+
+You can get a long way with ``tractor`` by treating it as "trio_
+with nurseries that spawn processes". But once you start asking
+*where does my msg actually go?*, *which process is that?* or
+*who keeps the phonebook?*, it pays to know how the runtime hangs
+together. This page walks the stack top to bottom.
+
+.. d2:: diagrams/runtime_stack.d2
+   :caption: The four runtime layers inside *every* actor process.
+   :alt: layer cake of app tasks, tractor runtime, IPC, OS process
+   :width: 70%
+
+The layer cake
+--------------
+
+Every actor process is the same four-layer sandwich:
+
+- **your app**: plain ``trio`` tasks, nurseries and cancel
+  scopes; nothing special. ``tractor`` is a `structured
+  concurrency`_ (SC) multi-processing runtime built on trio_ and
+  the whole pitch is that this layer stays *just trio*: no
+  callbacks, no futures, no proxy objects.
+- **the** ``tractor`` **runtime**: a per-process
+  :class:`tractor.Actor` running the msg loop and RPC task
+  scheduler, plus the user-facing primitives layered on it:
+  :class:`tractor.ActorNursery` (spawning + supervision),
+  :class:`tractor.Portal` (calling into a peer) and
+  :class:`tractor.Context` + :class:`tractor.MsgStream`
+  (SC-linked cross-actor task pairs and streaming).
+- **IPC channels**: one :class:`tractor.Channel` per connected
+  peer, each wrapping a ``MsgTransport`` that ships
+  msgspec_-typed msgs over TCP or UDS.
+- **the OS**: one process per actor, started by a swappable
+  spawn backend.
+
+The property that holds it all together: SC composes *through*
+the layers. A crash in a leaf actor's app task unwinds that
+actor's trio tree, ships across its IPC channel as a typed
+``Error`` msg, and unwinds the parent's trio tree in turn — the
+"SC-transitive supervision protocol" from the README's pitch.
+The whole tree cancels and errors like one big trio program; it
+just happens to be spread across processes.
+
+One actor, one process, one ``trio.run()``
+------------------------------------------
+
+A ``tractor`` "actor" is not a green thread, nor an object with
+a mailbox, nor a coroutine: it's one OS process running one
+:func:`trio.run` whose root task boots the runtime machinery —
+msg loop, RPC task scheduler, IPC server — all embodied by a
+single :class:`tractor.Actor` instance.
+
+.. margin:: Shared nothing
+
+   Processes buy you a real `shared nothing architecture`_: no
+   accidentally-shared mutable state, no GIL contention, and
+   every actor can be inspected (or killed) like any other OS
+   process.
+
+You rarely construct an :class:`~tractor.Actor` yourself; the
+runtime makes exactly one per process and you grab it with
+:func:`tractor.current_actor`:
+
+.. code:: python
+
+    import tractor
+
+    actor = tractor.current_actor()  # NoRuntime if none running
+    print(actor.aid.name)   # str name, need not be unique
+    print(actor.aid.uuid)   # uuid4 str, IS unique
+    print(actor.aid.pid)    # the OS pid
+    print(actor.uid)        # legacy (name, uuid) pair
+
+Identity is carried by the ``Aid`` msg-struct (see
+``tractor.msg.types``): a ``name``/``uuid``/``pid`` triple
+exchanged in the very first "mailbox handshake" whenever two
+actors connect. It's what the registrar stores and what shows up
+in logs and proc-titles. The older ``.uid`` 2-tuple of
+``(name, uuid)`` predates ``Aid`` and is still pervasive across
+the codebase; treat it as the legacy spelling of the same
+identity.
+
+If this smells like the `actor model`_, sure — but as the
+README warns, it probably doesn't look like what you *think* an
+actor model looks like, and that's intentional. Here an "actor"
+is purely a runtime-unit-of-abstraction: process +
+``trio.run()`` + IPC machinery.
+
+IPC: channels, transports, addresses
+------------------------------------
+
+Two connected actors talk through a :class:`tractor.Channel`: a
+duplex, per-peer msg pipe. Each ``Channel`` wraps a
+``MsgTransport`` instance which does the wire work: framing,
+encode/decode and the socket itself. The encoding is msgpack
+(via msgspec_) and *every* msg is an instance of one of the
+runtime's tagged-union :class:`msgspec.Struct` types: the
+``Aid`` handshake, ``Start``/``StartAck`` (RPC init),
+``Started``/``Yield``/``Stop``/``Return`` (the ctx dialog
+phases), ``Error``, etc. There is no raw-bytes mode; the
+msg-spec *is* the protocol, which is exactly what lets payloads
+be type-limited per-context (see ``pld_spec`` in
+:doc:`/guide/context`).
+
+Addresses come in two spellings:
+
+- *unwrapped*: the plain-tuple form you pass to user APIs —
+  ``('127.0.0.1', 1616)`` for tcp, or a
+  ``(<filedir>, <filename>)`` path-pair for uds;
+- *wrapped*: the internal ``TCPAddress``/``UDSAddress`` struct
+  types (plus libp2p-style multiaddr helpers over in
+  ``tractor.discovery``).
+
+You only ever need the tuple form; the runtime wraps and
+unwraps at the boundaries.
+
+TCP: the boring default
+***********************
+
+The default transport (``'tcp'``) binds each actor's IPC server
+to loopback ``('127.0.0.1', <random port>)`` unless told
+otherwise, and is the only choice when your tree spans hosts.
+Nothing exotic: ``trio`` TCP streams + length-prefixed msgpack
+framing.
+
+UDS: same-host, creds included
+******************************
+
+Pass ``enable_transports=['uds']`` and actors instead talk over
+unix-domain sockets, with socket files placed in the per-user
+runtime dir (``$XDG_RUNTIME_DIR/tractor/`` on linux, the
+``platformdirs`` equivalent elsewhere). Two perks over tcp on a
+single host:
+
+- no ports to fight over; addrs are just file paths,
+- the kernel snitches on your peer for free: the listening side
+  reads the connector's ``pid`` (plus ``uid``/``gid`` on linux)
+  straight off the socket via ``SO_PEERCRED`` /
+  ``LOCAL_PEERPID`` — no extra handshake msgs required B)
+
+.. warning::
+
+   Socket-file lifetime == listening actor lifetime. On
+   listener teardown the runtime ``os.unlink()``\s the socket
+   file immediately, so any *late* connection attempt (say, a
+   sub-actor racing to deregister with a registrar that's
+   already shutting down) fails with ``FileNotFoundError``.
+   And ofc, UDS is same-host only.
+
+Here's a full actor tree run entirely over uds:
+
+.. literalinclude:: ../../examples/uds_transport_actor_tree.py
+   :caption: examples/uds_transport_actor_tree.py
+   :language: python
+
+Picking a transport
+*******************
+
+Transport choice is per-actor via the ``enable_transports``
+kwarg accepted by :func:`tractor.open_root_actor` (and proxied
+through ``open_nursery()`` when it implicitly boots the
+runtime), plus per-child via
+``ActorNursery.start_actor(enable_transports=...)``. Two rules
+the runtime enforces today:
+
+- exactly ONE transport per actor: multi-transport actors are
+  on the roadmap but currently raise ``RuntimeError``;
+- your ``registry_addrs`` protos must all be in
+  ``enable_transports``: mismatches fail fast with
+  ``ValueError`` instead of (as in darker times) hanging the
+  registrar handshake forever.
+
+Spawn backends
+--------------
+
+How does an actor actually *become* a process? Via a swappable
+spawn backend, selected with the ``start_method`` kwarg to
+:func:`tractor.open_root_actor`:
+
+``'trio'`` (default)
+   The home-grown spawner: re-exec the child as
+   ``python -m tractor._child`` using ``trio``'s subprocess
+   machinery, then bootstrap it over the first IPC exchange
+   (the parent ships a ``SpawnSpec`` msg carrying all init
+   state). Supported on all platforms and the most battle
+   tested choice by far.
+
+``'mp_spawn'`` / ``'mp_forkserver'``
+   The stdlib :mod:`multiprocessing` start-methods of the same
+   names (forkserver is posix-only). Mostly interesting for
+   ecosystem compat and start-up-latency tuning.
+
+``'subint'`` (in development, py3.14+)
+   On the roadmap (not yet selectable via ``start_method`` on
+   this release): run each actor as a `PEP 734`_
+   sub-interpreter (``concurrent.interpreters``) driven on its
+   own OS thread *inside the parent process* — interpreter-level
+   shared-nothing isolation with much faster start-up. Yes, this
+   bends the one-actor-one-process rule; the rest of the model
+   is unchanged.
+
+The ``TRACTOR_SPAWN_METHOD`` env-var beats any caller-passed
+``start_method``, so you can swap backends under an unmodified
+app:
+
+.. code:: bash
+
+    TRACTOR_SPAWN_METHOD=mp_forkserver python my_app.py
+
+One current limitation worth knowing: ``debug_mode=True`` (the
+crash-to-REPL machinery) is only supported on backends whose
+child-side runtime is trio-native, e.g. the default ``'trio'``;
+see :doc:`/guide/debugging` for the deats.
+
+The registrar
+-------------
+
+Discovery needs a phonebook. Every actor, as part of boot,
+registers its ``Aid`` and bind-addrs with the *registrar*: an
+otherwise ordinary actor (a :class:`tractor.Registrar`, subtype
+of :class:`~tractor.Actor`) that keeps the name -> addrs table
+for the tree; on graceful exit each actor de-registers itself.
+
+.. margin:: Default registry addrs
+
+   With no ``registry_addrs`` passed:
+
+   - tcp: ``('127.0.0.1', 1616)``
+   - uds: ``registry@1616.sock``
+     in the runtime dir
+
+Who *is* the registrar? Decided at root boot, rendezvous style.
+:func:`tractor.open_root_actor` probes each addr in
+``registry_addrs`` with a quick connect-ping, then:
+
+- **somebody answered**: this root is a plain actor; it
+  registers with the existing registrar and binds random
+  same-proto addrs for its own IPC server;
+- **nobody answered**: this root *becomes* the registrar and
+  binds the registry addrs itself.
+
+So single-program trees need zero config — the root quietly
+self-appoints — while multi-program setups share a registrar by
+pointing every program at the same ``registry_addrs``. Pass
+``ensure_registry=True`` to demand that *this* call create the
+registry; it raises if the addrs are already served.
+
+The lookup APIs — :func:`tractor.find_actor`,
+:func:`tractor.wait_for_actor`, :func:`tractor.query_actor` and
+:func:`tractor.get_registry` — all consult it (after first
+checking already-connected peers):
+
+.. literalinclude:: ../../examples/service_daemon_discovery.py
+   :caption: examples/service_daemon_discovery.py
+   :language: python
+
+If you bump into "arbiter" in old issues or posts: that's the
+legacy name for the same thing, surviving in-code only as the
+``Arbiter = Registrar`` class alias; all current terminology is
+"registrar"/"registry". Fair warning per the README: this is
+still a **very naive** discovery sys (no re-election, no gossip
+protocol... yet) and a registrar is expected to outlive its
+registrants.
+
+Runtime env vars
+----------------
+
+A few env-vars let you re-tune a whole tree *without touching
+app code*; each wins over its corresponding kwarg:
+
+.. list-table::
+   :header-rows: 1
+   :widths: 30 44 26
+
+   * - env-var
+     - effect
+     - vs. kwarg
+   * - ``TRACTOR_LOGLEVEL``
+     - crank (or silence) console-log verbosity for every actor
+       in the tree
+     - beats ``loglevel``
+   * - ``TRACTOR_SPAWN_METHOD``
+     - swap the process spawn backend
+     - beats ``start_method``
+   * - ``TRACTOR_ENABLE_STACKSCOPE``
+     - install the ``SIGUSR1`` task-tree-dump handler in every
+       actor, even outside ``debug_mode`` (see
+       :doc:`/guide/debugging`)
+     - OR'd with ``enable_stack_on_sig``
+
+Spotting actors from your shell
+*******************************
+
+Every sub-actor sets an OS-level proc-title of the form
+``_subactor[<name>@<pid>]`` (via ``setproctitle``, silently
+skipped when not installed) so ``ps``/``htop``/``pstree`` show
+*which actor is which* at a glance. The README's signature
+incantation — watch a tree build and self-destruct live:
+
+.. code:: bash
+
+    $TERM -e watch -n 0.1 "pstree -a $$" \
+        & python examples/nested_actor_tree.py \
+        && kill $!
+
+For scripting there are two stable cmdline markers:
+
+.. code:: bash
+
+    pgrep -fa '_subactor\['     # live, titled sub-actors
+    pgrep -fa 'tractor._child'  # 'trio'-backend children not
+                                # yet (re)titled
+
+The title also lands in the kernel ``comm`` (truncated to ~15
+bytes) which survives into zombie state — that's what
+``tractor``'s own test-harness reapers key off. To be crystal
+clear about the contract though: you should never *need* a
+reaper; if you can create zombie child processes (without using
+a system signal) it **is a bug** — please report it!
+
+Logging
+-------
+
+The runtime logs through a thin adapter over stdlib
+:mod:`logging` that stamps every record with actor + task info.
+Two calls get you going:
+
+.. code:: python
+
+    from tractor.log import get_console_log, get_logger
+
+    log = get_logger(__name__)  # actor/task-aware sub-logger
+    get_console_log('info')     # attach console handler @ level
+
+(or just pass ``loglevel='info'`` to
+:func:`tractor.open_root_actor` and the console handler comes up
+with the runtime).
+
+``tractor`` adds custom levels — and matching logger methods —
+that slot between the stdlib ones so you can dial in *which
+runtime subsystem* you want to hear from: ``.transport()`` (5),
+``.runtime()`` (15), ``.devx()`` (17), ``.cancel()`` (22), plus
+a ``PDB`` (500) level for debugger chatter. E.g.
+``loglevel='cancel'`` plays the whole cancellation chorus while
+staying quiet about transport-layer noise. Beyond that
+``tractor`` isn't opinionated about how you consume logs: it's
+all stdlib ``logging`` underneath.
+
+Where to next?
+--------------
+
+.. seealso::
+
+   - :doc:`/guide/context` — the SC-linked cross-actor task API
+     that rides on every ``Channel``.
+   - :doc:`/guide/debugging` — ``debug_mode``, the multi-process
+     REPL and ``stackscope`` task-tree dumps.
+   - :doc:`/explain/sc-distributed` — *why*
+     one-actor-one-process, and what kind of "actor model" this
+     is (and isn't).
+
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _trio: https://github.com/python-trio/trio
+.. _actor model: https://en.wikipedia.org/wiki/Actor_model
+.. _shared nothing architecture: https://en.wikipedia.org/wiki/Shared-nothing_architecture
+.. _msgspec: https://jcristharif.com/msgspec/
+.. _PEP 734: https://peps.python.org/pep-0734/

docs/explain/index.rst

@@ -0,0 +1,16 @@
+Big ideas
+=========
+The conceptual core of ``tractor``: what *structured
+concurrency* (SC) means once your "tasks" are whole
+processes, and how the runtime is layered to deliver
+that without (much) magic.
+
+If you only read one page in these docs make it
+:doc:`sc-distributed`; if you read two, follow it with
+:doc:`architecture`.
+
+.. toctree::
+   :maxdepth: 2
+
+   sc-distributed
+   architecture

docs/explain/sc-distributed.rst

@@ -0,0 +1,221 @@
+Structured concurrency, across processes
+=========================================
+``tractor`` makes one bet: the discipline that made
+``trio``'s concurrency *readable* — `structured
+concurrency`_ (SC) — works just as well when the
+"tasks" are whole OS processes talking over a wire.
+This page distills what that means, from first
+principles, with as little ceremony as possible.
+
+.. margin:: The canon
+
+   If SC is new to you, the seminal `blog post`_ is
+   still the best hour you'll spend on concurrent
+   programming; the `trio docs`_, wikipedia's SC_
+   page and the diagrams over at libdill-docs_ round
+   it out nicely.
+
+SC in one breath
+----------------
+Structured concurrency is the rule that **concurrency
+gets a scope**: every task is spawned *inside* a block
+(a ``trio`` *nursery*) and that block **cannot exit
+until every task it spawned has finished** — returned,
+errored, or been cancelled.
+
+That one rule buys you the properties you already
+rely on in sequential code,
+
+- a function call is a *black box*: when it returns,
+  everything it started is **done** — no secret
+  background tasks leaking out the sides,
+- an exception **always has somewhere to go**: up the
+  (task) tree to a parent which is, by construction,
+  still there waiting,
+- cancellation has a well defined *shape*: cancel a
+  scope and it flows down to every task inside it,
+  and only those.
+
+In short: your **runtime task tree matches your source
+code's indentation**. Concurrency you can read.
+
+The leap: process-shaped tasks
+------------------------------
+Now swap "task" for "process".
+
+A ``tractor`` *actor* is just a Python process running
+its own ``trio.run()`` — its own private task tree,
+sharing **nothing** with its siblings. You spawn
+actors from an :class:`tractor.ActorNursery`, which
+behaves exactly the way the name implies,
+
+.. code:: python
+
+    async with tractor.open_nursery() as an:
+        portal = await an.start_actor(
+            'worker',
+            enable_modules=[__name__],
+        )
+        ...
+    # ^ block exit == every spawned process has
+    # completed, errored or been cancelled, and
+    # been **reaped**. No exceptions, no zombies.
+
+so the whole program becomes a *tree of process-trees*
+— a `supervision tree`_ in erlang-speak — where every
+arrow means "spawned by, **waited on by**, and
+supervised by".
+
+.. d2:: diagrams/actor_tree.d2
+   :caption: A ``tractor`` program: a process tree of
+       ``trio`` task trees; every parent **must wait**
+       on its children.
+   :width: 85%
+
+Causality: no process outlives its parent
+-----------------------------------------
+The stdlib's ``multiprocessing`` (and most "job
+queue" systems) treat child processes as
+fire-and-forget by default: orphans, zombies, lost
+tracebacks and ``kill -9`` cleanup scripts are *your*
+problem. ``tractor`` instead inherits ``trio``'s
+`causality`_ discipline,
+
+- **no spawning willy-nilly**: every actor is born
+  from a nursery block with a known parent,
+- **lifetimes nest**: a sub-actor's entire process
+  tree lives strictly inside its parent's nursery
+  scope,
+- **teardown is guaranteed**: when a scope exits (or
+  errors, or is cancelled) the runtime SIGINTs,
+  waits, and (only if it must) hard-kills + reaps
+  everything underneath.
+
+We take the zombie thing personally: *if you can
+create orphaned child processes without using a
+system signal, it* **is a bug** — and there's a test
+suite to back that sentence up.
+
+Errors always propagate (yes, across the wire)
+----------------------------------------------
+In ``trio``, an exception in any task tears through
+its nursery to a parent that must handle it —
+`exceptions always propagate`_. ``tractor`` extends
+the same guarantee across process boundaries: an
+uncaught error in a remote task is
+
+1. captured + serialized in the child,
+2. shipped home over IPC as a typed ``Error`` msg,
+3. re-raised in the parent **boxed** as a
+   :class:`tractor.RemoteActorError` carrying the
+   original type (``.boxed_type``), a rendered remote
+   traceback, and the erroring actor's id,
+
+while the supervising nursery applies its (currently
+*one-cancels-all*, just like ``trio``) strategy to any
+sibling actors. A crash three processes deep arrives
+at your shell as one coherent, causal traceback chain
+— not a silent dead worker and a stuck queue.
+
+Cancellation is a request, supervision is the rule
+--------------------------------------------------
+Cancellation likewise keeps ``trio``'s semantics
+*verbatim*, just transported: cancelling an actor
+nursery (or a single :class:`tractor.Context` between
+two tasks in different processes) sends an explicit
+cancel **request** over IPC which the remote runtime
+translates into a real ``trio`` cancel-scope cancel —
+then *acks back* so the requester can await
+confirmation within a bounded time. Nothing is ever
+"just killed" first; graceful always precedes brutal.
+
+Because every cross-process dialog is a pair of
+**linked tasks** — one on each side, each inside its
+own cancel scope — SC stays *transitive*: supervision
+doesn't stop at the process boundary, it tunnels
+through every hop of the tree. The wire protocol that
+enforces this (a small set of typed msgs:
+``Start``/``Started``/``Yield``/``Stop``/``Return``/
+``Error``) is detailed in :doc:`/guide/msging` and
+:doc:`/guide/context`.
+
+Hold up, is this an "actor model"?
+----------------------------------
+Let's stop and ask how many canon actor model papers
+you've actually read ;)
+
+From our experience many "actor systems" aren't really
+"actor models" since they **don't adhere** to the `3
+axioms`_ and pay even less attention to the problem of
+`unbounded non-determinism`_ — which was the whole
+point for creating the model in the first place.
+
+From `the author's mouth`_, the **only** requirement
+is `adherence to`_ the `3 axioms`_::
+
+    In response to a message, an actor may:
+
+    - send a finite number of new messages
+    - create a finite number of new actors
+    - designate a new behavior to process subsequent
+      messages
+
+Want to debate whether that makes us a "real" actor
+model? Chime in on our chat, or on one of these issues
+*after you've read everything in them* ;)
+
+- `#210 <https://github.com/goodboy/tractor/issues/210>`_
+- `#18 <https://github.com/goodboy/tractor/issues/18>`_
+
+``tractor`` adheres — actors exchange msgs, spawn
+actors, and swap behaviors — **with no extra API** to
+learn. What we *don't* copy is the cultural baggage:
+no visible mailboxes, no untyped fire-and-forget
+``send()``, no "let it crash" without a supervisor
+that actually hears about it, and definitely no
+shared-reference *proxy objects* pretending the
+network isn't there. If our "actors" don't look like
+what you expected, that's **intentional**: being an
+actor model is just one property of the system; being
+*structured* is the point.
+
+Why processes at all?
+---------------------
+Python has a GIL; an actor model by definition shares
+no state; so the *process* is the natural runtime
+unit — you get real multi-core parallelism and hard
+memory isolation for free. But the deeper win is
+uniformity: because actors only ever talk via msgs
+over a :class:`tractor.Channel` (TCP, UDS, more to
+come), the **same code** runs your laptop's worker
+pool and a multi-host cluster; "distributed" is a
+deployment detail, not an API.
+
+It's just ``trio``
+------------------
+If you remember one framing, make it this: ``tractor``
+**is just** ``trio`` — with nurseries that can spawn
+processes and streams that can cross them. Same
+nursery discipline, same cancellation semantics, same
+"how was this not always the API?" feeling, one level
+up the process tree.
+
+.. seealso::
+
+   :doc:`/explain/architecture` for how the runtime
+   layers deliver all of the above, and
+   :doc:`/start/quickstart` to feel it in ~20 lines of
+   code.
+
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
+.. _trio docs: https://trio.readthedocs.io/en/latest/
+.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html
+.. _supervision tree: https://www.erlang.org/doc/design_principles/des_princ.html
+.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
+.. _exceptions always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
+.. _the author's mouth: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=162s
+.. _adherence to: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=1821s
+.. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts
+.. _unbounded non-determinism: https://en.wikipedia.org/wiki/Unbounded_nondeterminism

docs/guide/asyncio.rst

@@ -0,0 +1,309 @@
+Infected ``asyncio``
+====================
+``tractor`` is "just trio_", but the Python world is packed with
+libraries that only speak ``asyncio``: websocket stacks, vendor
+SDKs, that one exchange client you can't route around. Rather than
+make you rewrite them, ``tractor`` lets you *quarantine* them inside
+a dedicated subactor which runs both event loops at once, with full
+`structured concurrency`_ (SC) guarantees maintained across the
+loop boundary *and* the process tree.
+
+In the project's own words:
+
+    Yes, we spawn a python process, run ``asyncio``, start ``trio``
+    on the ``asyncio`` loop, then send commands to the ``trio``
+    scheduled tasks to tell ``asyncio`` tasks what to do XD
+
+We call this "infected ``asyncio``" mode: the subactor's stdlib
+loop runs as the *host* with ``trio`` embedded on top in `guest`_
+mode, and your ``trio`` tasks drive ``asyncio`` tasks through
+a linked, SC-supervised, in-memory channel.
+
+.. d2:: diagrams/infected_aio.d2
+   :caption: One process, two schedulers: ``trio`` rides the
+       ``asyncio`` loop as a guest while the parent speaks plain
+       ``tractor`` IPC, none the wiser.
+   :alt: parent actor connected over IPC to a subactor whose
+       asyncio loop hosts trio in guest mode, with a
+       LinkedTaskChannel pairing a trio task to an asyncio task
+
+.. note::
+
+   Infected ``asyncio`` mode is **experimental**: it works (we
+   beat on it plenty) but parts of the API surface and some
+   edge-case semantics are still settling. Got opinions on the
+   interop design? Feel free to sling them in `#273`_!
+
+How the infection takes hold
+----------------------------
+A normal subactor boots by running the ``tractor`` runtime's task
+tree directly under ``trio.run()``. Pass ``infect_asyncio=True``
+at spawn time and the child's entrypoint changes shape entirely:
+
+1. the process starts the stdlib loop via ``asyncio.run()``,
+2. the first ``asyncio`` task calls
+   ``trio.lowlevel.start_guest_run()``, embedding the ``trio``
+   scheduler *inside* the already running ``asyncio`` loop (the
+   upstream `guest`_-mode feature),
+3. the regular ``tractor`` runtime then boots on the guest
+   ``trio`` side and connects back to its parent like any other
+   subactor.
+
+.. margin:: Symptoms
+
+   Looks like your stdlib event loop has caught a case of "the
+   trios"! Don't worry, you'll barely notice; and if anything
+   gets too bad, your parents will know about it B)
+
+Both schedulers interleave in a single thread, no GIL gymnastics
+required. From the rest of the actor tree the infected child is
+indistinguishable from any other actor: same IPC protocol, same
+supervision and cancellation semantics, same zombie-safety
+guarantees. The difference is purely internal: ``trio`` tasks in
+that process can start and drive ``asyncio`` tasks through the
+``tractor.to_asyncio`` API.
+
+Spawning an infected subactor
+-----------------------------
+Just flip the flag on :meth:`tractor.ActorNursery.start_actor`:
+
+.. code:: python
+
+    async with tractor.open_nursery() as an:
+        portal = await an.start_actor(
+            'aio_side',
+            enable_modules=[__name__],
+            infect_asyncio=True,
+        )
+
+The one-shot convenience ``ActorNursery.run_in_actor()`` accepts
+the same flag. The ``to_asyncio`` APIs may **only** be called from
+tasks inside an infected actor; calling them anywhere else raises
+a loud ``RuntimeError``. You can introspect at runtime with
+``tractor.current_actor().is_infected_aio()``.
+
+Linking tasks with ``open_channel_from()``
+------------------------------------------
+The core primitive is :func:`tractor.to_asyncio.open_channel_from`,
+an async context manager which starts your ``asyncio`` function as
+a real ``asyncio.Task`` and yields a two-way channel linking it to
+the calling ``trio`` task:
+
+.. code:: python
+
+    from tractor import to_asyncio
+
+    async with to_asyncio.open_channel_from(
+        aio_main,        # async def aio_main(chan, **kwargs)
+        period=0.5,      # extra kwargs are passed through
+    ) as (chan, first):
+        await chan.send('tick')
+
+The semantics deliberately mirror the inter-actor ``Context``
+handshake from :doc:`/guide/context`:
+
+- the target fn must declare a parameter literally named ``chan``;
+  the runtime injects the shared
+  :class:`~tractor.to_asyncio.LinkedTaskChannel` by keyword.
+- the ``trio`` side blocks at entry until the ``asyncio`` task
+  calls ``chan.started_nowait(value)``; that value is delivered as
+  ``first``, exactly like the ``(ctx, first)`` pair you get from
+  ``Portal.open_context()`` after the child calls
+  ``ctx.started()``.
+- a first value **must** be sent from the ``asyncio`` side or the
+  ``trio`` side will never unblock.
+- on block exit the pair is torn down *together*; neither task can
+  outlive the other (more on this below).
+
+A full example: the echo server
+-------------------------------
+Here's the canonical demo, a round-trip echo service where the
+``asyncio`` task is told what to do by a ``trio`` task which is in
+turn driven over IPC by the root actor:
+
+.. literalinclude:: ../../examples/infected_asyncio_echo_server.py
+   :caption: examples/infected_asyncio_echo_server.py
+   :language: python
+
+What's going on?
+
+- there are three task layers: the root actor's pure ``trio``
+  task, the infected child's ``trio``-side ``@tractor.context``
+  endpoint (``trio_to_aio_echo_server()``), and the child's
+  ``asyncio`` task (``aio_echo_server()``).
+- two ``started``-style handshakes compose: the aio task's
+  ``chan.started_nowait('start')`` unblocks the child's
+  ``open_channel_from()`` entry, then the child relays that same
+  value up via ``await ctx.started(first)`` which unblocks the
+  root's ``open_context()`` entry. Synchronization all the way
+  down, er, up.
+- each round trip flows: root ``stream.send()`` -> IPC -> child
+  ``async for msg in stream`` -> ``chan.send(msg)`` -> aio
+  ``await chan.get()`` -> ``chan.send_nowait()`` -> child
+  ``chan.receive()`` -> ``stream.send(out)`` -> IPC -> root.
+- when the root breaks out of its stream loop and exits the
+  context block, the child's stream ends, its channel block exits,
+  and the ``asyncio`` task is reaped along with it; the final
+  ``portal.cancel_actor()`` then tears down the whole process. No
+  orphaned ``asyncio`` tasks, no zombie procs; if you manage to
+  create either it **is a bug**.
+
+``LinkedTaskChannel``: one channel, two sides
+---------------------------------------------
+The same channel object is shared by both tasks; which methods you
+call depends on which loop schedules your task. The ``trio`` side
+gets a standard ``trio.abc.Channel`` interface while the
+``asyncio`` side gets queue-flavored, mostly-sync methods:
+
+.. list-table::
+   :header-rows: 1
+   :widths: 14 36 50
+
+   * - side
+     - call
+     - what it does
+   * - ``trio``
+     - ``await chan.send(item)``
+     - ship ``item`` to the ``asyncio`` task (enqueues onto an
+       internal ``asyncio.Queue``).
+   * - ``trio``
+     - ``await chan.receive()``
+     - wait for the next value from the ``asyncio`` side; the
+       channel also supports ``async for``.
+   * - ``trio``
+     - ``await chan.wait_for_result()``
+     - block until the ``asyncio`` task completes; return its
+       final result or raise its (translated) error.
+   * - ``trio``
+     - ``chan.subscribe()``
+     - acm yielding a ``BroadcastReceiver`` so N local tasks can
+       each consume a copy of the inbound stream (see below).
+   * - ``trio``
+     - ``chan.cancel_asyncio_task()``
+     - explicitly request cancellation of the linked ``asyncio``
+       task.
+   * - ``asyncio``
+     - ``chan.started_nowait(value)``
+     - deliver the "first" value; unblocks the ``trio`` side's
+       ``open_channel_from()`` entry (mirrors ``ctx.started()``).
+   * - ``asyncio``
+     - ``await chan.get()``
+     - wait for the next value sent from the ``trio`` side.
+   * - ``asyncio``
+     - ``chan.send_nowait(item)``
+     - push a value to the ``trio`` side without blocking.
+
+Fan-out with ``.subscribe()``
+*****************************
+Just like :meth:`tractor.MsgStream.subscribe` does for IPC
+streams, ``chan.subscribe()`` lets multiple local ``trio`` tasks
+each receive *every* value sent from the single ``asyncio`` task:
+
+.. code:: python
+
+    async with chan.subscribe() as bcast:
+        async for msg in bcast:
+            ...
+
+The underlying broadcast machinery is lazily allocated on first
+use and is *not* reversible for the channel's remaining lifetime,
+so only reach for it when you actually want the fan-out.
+
+One-shot calls with ``run_task()``
+----------------------------------
+When you just want a single ``asyncio`` result and no streaming
+dialog, skip the channel ceremony and use
+:func:`tractor.to_asyncio.run_task`:
+
+.. code:: python
+
+    import asyncio
+    from tractor import to_asyncio
+
+    async def aio_fetch(url: str) -> str:
+        await asyncio.sleep(0.3)   # pretend-IO, aio style
+        return f'<html>sup {url}</html>'
+
+    # from any trio task inside the infected actor:
+    page = await to_asyncio.run_task(aio_fetch, url='https://x.io')
+
+It schedules the fn as an ``asyncio.Task``, waits for completion
+and hands the return value back to ``trio``; think of it as the
+cross-loop sibling of ``ActorNursery.run_in_actor()``. Errors and
+cancellation are translated exactly as for channels.
+
+Cross-loop errors and cancellation
+----------------------------------
+The paired tasks are *SC linked*: exception and cancel handling
+tears down **both** sides on any unexpected error or cancellation,
+in either loop. There is no fire-and-forget mode; a
+``LinkedTaskChannel`` is a supervision scope just like a
+``Context`` is across processes.
+
+Because each loop has its own (incompatible) cancellation and exit
+machinery, boundary crossings are translated into dedicated
+exception types, all importable from ``tractor.to_asyncio``:
+
+.. list-table::
+   :header-rows: 1
+   :widths: 26 22 52
+
+   * - exception
+     - raised in
+     - meaning
+   * - ``AsyncioCancelled``
+     - the ``trio`` task
+     - the linked ``asyncio`` task was cancelled by itself or
+       a 3rd party (i.e. *not* by the ``trio`` side).
+   * - ``AsyncioTaskExited``
+     - the ``trio`` task
+     - the ``asyncio`` task returned/exited early while the
+       ``trio`` side still held the link open.
+   * - ``TrioCancelled``
+     - the ``asyncio`` task
+     - the ``trio`` side was cancelled (or crashed) so the
+       ``asyncio`` task is being torn down per SC rules.
+   * - ``TrioTaskExited``
+     - the ``asyncio`` task
+     - the ``trio`` side exited gracefully while the ``asyncio``
+       task was still running; a "clean shutdown" signal much
+       like closing a ``trio`` mem-chan.
+
+By default ``open_channel_from(suppress_graceful_exits=True)``
+absorbs the two ``*TaskExited`` signals so happy-path teardown
+stays silent; pass ``False`` when your app wants to handle early
+peer-exit explicitly.
+
+Past the task pair, everything composes with the normal actor
+story: an unhandled ``asyncio`` error is translated into the
+``trio`` side, propagates out of your ``@tractor.context``
+endpoint, and arrives at the parent boxed as
+a :class:`tractor.RemoteActorError`. One SC discipline,
+end-to-end, across loops *and* processes.
+
+Breakpoints in ``asyncio`` tasks
+--------------------------------
+Yes, the multi-actor REPL works here too. With
+``debug_mode=True`` enabled on your tree the ``trio`` side of an
+infected actor can ``await tractor.pause()`` as usual, and with
+greenback enabled (``maybe_enable_greenback=True``) even the
+builtin ``breakpoint()`` works from *inside* ``asyncio`` tasks;
+see ``examples/debugging/asyncio_bp.py`` for the full tour. The
+root-TTY locking dance behind all this is covered in
+:doc:`/guide/debugging`.
+
+Where to next?
+--------------
+.. seealso::
+
+   - :doc:`/guide/context` for the inter-actor handshake and
+     streaming APIs which this whole interop layer mirrors.
+   - :doc:`/guide/msging` for typing the payloads you shuttle
+     between actors (and loops).
+   - :doc:`/guide/debugging` for the multi-process REPL that
+     keeps working even when your loop has "the trios".
+
+.. _trio: https://github.com/python-trio/trio
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops
+.. _#273: https://github.com/goodboy/tractor/issues/273

docs/guide/cancellation.rst

@@ -0,0 +1,285 @@
+Cancellation and error propagation
+==================================
+
+``tractor`` supports ``trio``'s cancellation_ system *verbatim*,
+then extends it across process boundaries. If you know how to
+cancel a task in ``trio`` you already know how to cancel an actor —
+and its whole subtree — in ``tractor``; the runtime's job is making
+that statement hold over IPC with every structured concurrency (SC)
+guarantee intact.
+
+The ground rules,
+
+- a remote actor is **never** cancelled unless explicitly requested
+  (by a parent or peer), unless supervision demands it (an error
+  triggered one-cancels-all teardown), or unless there's a bug in
+  ``tractor`` itself (please report it!),
+- (remote) errors `always propagate`_ back to the parent
+  supervisor; nothing is silently dropped on the floor,
+- every spawned process gets reaped no matter how it dies; if you
+  can create a zombie child process (without using a system signal)
+  it **is a bug**.
+
+``trio`` cancellation, across the wire
+--------------------------------------
+
+Locally everything is bog-standard ``trio``: nurseries, cancel
+scopes, timeouts. ``tractor`` adds exactly one twist: a cancel
+scope can't physically reach into another process, so the runtime
+*relays cancellation as messages*. Concretely,
+
+- cancelling an *actor* means sending it a runtime-cancel request
+  msg; the target then runs its own graceful teardown — cancelling
+  RPC tasks, closing channels, exiting its :func:`trio.run` — and
+  acks the request back to the canceller,
+- cancelling a single *cross-actor task* works through the
+  :class:`tractor.Context` layer: each ``ctx`` task-pair is
+  cancel-scope-linked over IPC such that either side erroring or
+  cancelling relays an equivalent error to the other side (see
+  :doc:`/guide/context` for the gory details),
+- a cancel is therefore always a *request with an ack*: the
+  canceller does a **bounded wait** for confirmation and escalates
+  if the peer is unresponsive (see the teardown ladder below).
+
+One-cancels-all supervision
+---------------------------
+
+An :class:`tractor.ActorNursery` supervises subactors `exactly like
+trio`_ nurseries supervise tasks: when one child errors, the error
+propagates to the supervising block and **all** sibling subactors
+get cancelled before the error continues bubbling up the (process)
+tree.
+
+.. d2:: diagrams/error_propagation.d2
+   :caption: One-cancels-all: no zombies, no lost errors.
+   :alt: error propagation up a subactor tree
+   :width: 80%
+
+.. literalinclude:: ../../examples/remote_error_propagation.py
+   :caption: examples/remote_error_propagation.py
+   :language: python
+
+What's going on here?
+
+- three healthy actors are spawned as daemons via
+  :meth:`tractor.ActorNursery.start_actor`; left alone they'd
+  happily idle forever,
+- a fourth actor runs ``assert_err()`` via ``.run_in_actor()`` and
+  promptly trips its ``assert 0``,
+- the resulting ``AssertionError`` ships back over IPC as a
+  serialized error msg and re-raises *boxed* inside the nursery
+  block as a :class:`tractor.RemoteActorError`,
+- the nursery reacts like any ``trio`` nursery would: it cancels
+  the three healthy siblings (graceful runtime-cancel requests,
+  acks awaited), reaps all four processes, then re-raises,
+- ``trio.run(main)`` sees that same ``RemoteActorError`` in the
+  parent-most process — propagation is end-to-end or bust.
+
+This one-cancels-all style is currently the *only* supervision
+strategy offered (it's the one ``trio`` gives you); more
+`erlang strategies`_ are roadmap, see the bottom of this page.
+
+The boxed-error bestiary
+------------------------
+
+All remote failures arrive locally as one of a small set of
+exception types, each carrying enough metadata to work out *who*
+failed, *where*, and *why*.
+
+``RemoteActorError``
+********************
+
+The workhorse: a "boxed" exception relayed over IPC from another
+actor. The original error's type, traceback string and msgdata are
+preserved so you can pattern-match on what actually went wrong
+remotely,
+
+- ``.boxed_type``: the reconstructed **type** of the original
+  remote exception (``ValueError``, ``NameError``, what have you),
+- ``.src_uid``: the ``(name, uuid)`` pair of the actor where the
+  error *originated*,
+- ``.relay_uid`` / ``.relay_path``: when an error crosses more than
+  one actor boundary (grandchild -> child -> root) every relaying
+  actor is recorded; multi-hop boxings are lovingly referred to as
+  "inceptions" in the runtime internals,
+- ``.pformat()``: a rich "tb box" rendering of the remote traceback
+  for your logs or REPL.
+
+.. code:: python
+
+    try:
+        async with portal.open_context(ep) as (ctx, first):
+            ...
+    except tractor.RemoteActorError as rae:
+        if rae.boxed_type is ValueError:
+            ...  # the remote task raised `ValueError`
+
+``ContextCancelled``
+********************
+
+The cancel-ack for a cross-actor task pair: raised when a
+:class:`tractor.Context` task is cancelled *by request*. Its
+``.canceller`` attr is the uid of the actor which **requested** the
+cancel, which powers the key rule,
+
+- if **you** requested it (you called
+  :meth:`tractor.Context.cancel`) the resulting ctxc is *absorbed*
+  at ``open_context()`` exit: an expected outcome, not an error,
+- if **anyone else** did — the peer task, or some third-party actor
+  — it *raises* locally so your code always hears about it.
+
+The full self- vs. cross-cancel semantics are a core teaching point
+of :doc:`/guide/context`; go read them there.
+
+``MsgTypeError``
+****************
+
+An IPC-payload "type error": a msg violated the dialog's declared
+payload spec. See :doc:`/guide/msging` for the typed-messaging
+system which enforces it.
+
+``TransportClosed``
+*******************
+
+The underlying IPC transport (TCP stream, UDS socket, ...) died or
+closed out from under a channel. You'll normally only see this
+surface when a peer hard-exits without any graceful runtime
+teardown; the supervision machinery treats unexpected transport
+loss on a busy channel as a failure and tears down accordingly.
+
+Pick your blast radius
+----------------------
+
+Three cancel surfaces, three scopes of effect; choose the smallest
+hammer that does the job.
+
+.. list-table::
+   :header-rows: 1
+   :widths: 36 34 30
+
+   * - surface
+     - cancels
+     - typical use
+   * - :meth:`tractor.ActorNursery.cancel`
+     - every subactor in the nursery
+     - whole-tree teardown
+   * - :meth:`tractor.Portal.cancel_actor`
+     - one actor: full runtime + proc
+     - daemon teardown
+   * - :meth:`tractor.Context.cancel`
+     - exactly one remote task
+     - surgical task cancel
+
+``ActorNursery.cancel()``
+*************************
+
+The big red button: gracefully cancel every subactor supervised by
+the nursery, in parallel, with the escalation discipline below
+applied per-child. It's invoked for you whenever an error hits the
+nursery block (one-cancels-all); call it yourself for an orderly
+early shutdown. Passing ``hard_kill=True`` skips the graceful phase
+and goes straight to OS-level process termination — rarely what you
+want outside tests.
+
+``Portal.cancel_actor()``
+*************************
+
+Cancel one **whole actor**: its entire runtime, every task it's
+scheduled, and (for subactors) the OS process, via a graceful
+runtime-cancel request,
+
+.. code:: python
+
+    await portal.cancel_actor()    # bounded wait, bool result
+    await portal.cancel_actor(
+        raise_on_timeout=True,     # no ack in time?
+    )                              # -> `ActorTooSlowError`
+
+The wait for the peer's ack is *bounded* (default
+``Portal.cancel_timeout = 0.5`` seconds, tunable per call via
+``timeout=``). By default a missed ack just returns ``False``; with
+``raise_on_timeout=True`` you instead get an ``ActorTooSlowError``
+(from ``tractor._exceptions``) so *your* code can escalate per SC
+discipline — exactly what the nursery's own teardown does
+internally before resorting to OS-level signalling.
+
+Note the granularity: this cancels an **actor**, not a task. For
+one remote task use the ``Context`` layer instead.
+
+``Context.cancel()``
+********************
+
+Request cancellation of exactly one remote task: the peer task of
+an open :class:`tractor.Context`. Two things to keep straight,
+
+- it cancels the **remote** side only; a ``Context`` is *not* a
+  :class:`trio.CancelScope` and your local task keeps running until
+  you exit the ``open_context()`` block,
+- the resulting :class:`tractor.ContextCancelled` is absorbed
+  locally (you asked for it, after all) per the self- vs.
+  cross-cancel rule above.
+
+Again, :doc:`/guide/context` covers this dance in depth.
+
+Graceful first, hard as a last resort
+-------------------------------------
+
+.. margin:: REPL-safe by design
+
+   The hard-kill path is *skipped* whenever an actor in the tree
+   holds the debug-REPL lock (``debug_mode=True`` flavors):
+   SIGTERM raining down on a tree mid-``pdb`` session would
+   clobber your prompt. See :doc:`/guide/debugging`.
+
+Every process teardown in ``tractor`` walks the same escalation
+ladder, top rung first,
+
+1. **graceful cancel request**: a runtime-cancel msg over IPC; the
+   target actor cancels its tasks, closes its channels and exits
+   its :func:`trio.run` cleanly,
+2. **soft wait**: the parent waits (bounded) for the child process
+   to exit on its own,
+3. **SIGTERM**: no ack within the bounded wait (internally an
+   ``ActorTooSlowError``) escalates to ``proc.terminate()``,
+4. **SIGKILL ultimatum**: still alive after the hard-kill timeout
+   (~1.6s)? The runtime logs that the "T-800" has been deployed to
+   collect the zombie and issues ``proc.kill()``. No survivors.
+
+The result is the **no-zombies guarantee**: ``tractor`` tries to
+protect you from zombies, no matter what. Quoting the project
+manifesto,
+
+    If you can create zombie child processes (without using
+    a system signal) it **is a bug**.
+
+Run the quickstart's self-destructing process-tree demo
+(``examples/parallelism/we_are_processes.py``, walked through in
+:doc:`/start/quickstart`) under a ``pstree`` watcher and try to
+catch a
+straggler; we'll wait B)
+
+Roadmap: ``erlang``-style strategies
+------------------------------------
+
+One-cancels-all is ``trio``'s strategy and, for now, the only one
+``tractor`` ships. Pluggable `erlang strategies`_ — one-for-one
+restarts, rest-for-one, transient/permanent child specs and friends
+(see the `supervision strategies`_ canon) — are a long-standing
+roadmap item tracked in `#22`_. If supervisors are your jam that
+issue is the place to sling opinions.
+
+.. seealso::
+
+   - :doc:`/guide/context` — the cross-actor task layer where
+     per-task cancellation actually lives,
+   - :doc:`/guide/msging` — the typed msg layer that raises
+     :class:`tractor.MsgTypeError`,
+   - :doc:`/guide/debugging` — what cancellation does (and very
+     carefully does *not* do) while a REPL is up.
+
+.. _cancellation: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-and-timeouts
+.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
+.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
+.. _erlang strategies: https://learnyousomeerlang.com/supervisors
+.. _supervision strategies: https://www.erlang.org/doc/system/sup_princ.html
+.. _#22: https://github.com/goodboy/tractor/issues/22

docs/guide/clustering.rst

@@ -0,0 +1,127 @@
+Higher-level cluster APIs
+=========================
+
+Sometimes you don't want a hand-crafted supervision tree; you want
+"a pile of workers, one per core, now please". For that there's
+:func:`tractor.open_actor_cluster`: a convenience wrapper which
+spawns a *flat* cluster of subactors and hands you back a portal to
+each,
+
+.. code:: python
+
+    @acm
+    async def open_actor_cluster(
+        modules: list[str],            # RPC allowlist for workers
+        count: int = cpu_count(),      # one per core by default
+        names: list[str]|None = None,  # default: 'worker_{i}'
+        hard_kill: bool = False,       # fwd to `an.cancel()`
+        **runtime_kwargs,              # fwd to `open_root_actor()`
+    ) -> AsyncGenerator[dict[str, tractor.Portal], None]:
+
+A cluster in one block
+----------------------
+
+.. literalinclude:: ../../examples/quick_cluster.py
+   :caption: examples/quick_cluster.py
+   :language: python
+
+Walkthrough,
+
+- ``open_actor_cluster(modules=[__name__])`` concurrently spawns
+  one subactor per detected core (per
+  :func:`multiprocessing.cpu_count`); the ``modules`` list is the
+  usual ``enable_modules``-style capability allowlist so workers
+  may run functions defined in this module,
+- it yields a ``dict[str, tractor.Portal]`` mapping worker name to
+  portal; note the keys get prefixed with the *spawning* actor's
+  name, so from the root you'll see ``'root.worker_0'``,
+  ``'root.worker_1'``, etc.,
+- a plain :class:`trio.Nursery` then fans out one
+  ``portal.run(sleepy_jane)`` per worker; each prints its actor
+  ``.uid`` from inside its own process then naps forever — what
+  runs *inside* each worker (and how many tasks you point at it)
+  is entirely yours to compose,
+- ``tractor.trionics.collapse_eg()`` un-nests the strict
+  ``ExceptionGroup`` wrapping so the demo's ``KeyboardInterrupt``
+  surfaces as itself instead of arriving eg-boxed,
+- on block exit the whole fleet is torn down for you via
+  :meth:`tractor.ActorNursery.cancel`; pass ``hard_kill=True`` at
+  open time to skip straight to OS-level termination instead of
+  the graceful ladder described in :doc:`/guide/cancellation`.
+
+Sizing, naming, fleet-wide options
+----------------------------------
+
+``count`` doesn't have to be core-count and the auto-generated
+``'worker_{i}'`` names are just the default; pass your own (the
+length must match ``count`` or you get a ``ValueError``). Any
+extra ``**runtime_kwargs`` pass through verbatim to
+:func:`tractor.open_root_actor`, so fleet-wide runtime options are
+one kwarg away,
+
+.. code:: python
+
+    async with tractor.open_actor_cluster(
+        modules=['mylib.workers'],
+        count=4,
+        names=['scout', 'miner', 'smelter', 'smith'],
+        debug_mode=True,    # whole-fleet crash-to-REPL
+    ) as portal_map:
+        ...
+
+From here the composition patterns are the usual ``tractor`` fare:
+``portal.run()`` for one-shot calls (as in the demo), or — for a
+persistent bidirectional dialog per worker — concurrently enter N
+``portal.open_context()`` blocks with
+``tractor.trionics.gather_contexts()``; see :doc:`/guide/context`
+for that whole layer.
+
+Clusters vs. nurseries
+----------------------
+
+.. d2:: diagrams/actor_tree.d2
+   :margin:
+   :caption: The general shape: arbitrary nesting. A cluster is
+       this, minus the nesting.
+   :alt: a nested supervision tree of subactors
+
+``open_actor_cluster()`` is sugar, not a new primitive: under the
+hood it's just :func:`tractor.open_nursery` plus N concurrent
+``start_actor()`` calls plus a ``.cancel()`` on the way out. Reach
+for it when,
+
+- you want a *flat*, homogeneous fleet (classic worker-pool or
+  map-style fan-out shapes),
+- "one per core" — or a fixed ``count`` — is the right sizing
+  story,
+- every child can share the same spawn options.
+
+Drop down to a raw :class:`tractor.ActorNursery` when the topology
+gets any fancier: nested trees, heterogeneous children, per-child
+``debug_mode``/transport/module options, daemons mixed with
+one-shot workers, and so on (see :doc:`/guide/parallelism` for a
+hand-rolled pool). Either way the supervision semantics are
+identical: one-cancels-all error propagation and the no-zombies
+guarantee from :doc:`/guide/cancellation` apply to clusters too.
+
+Provisional, by design
+----------------------
+
+.. note::
+
+   APIs in this section are considered **provisional**: the
+   signature and semantics of :func:`tractor.open_actor_cluster`
+   may shift as higher-level supervision machinery lands. We
+   encourage you to try it and provide feedback — the
+   `matrix channel`_ is the place to say hi, and `#22`_ tracks the
+   broader supervisor-strategy roadmap.
+
+.. seealso::
+
+   - :doc:`/guide/parallelism` — worker pools built "by hand" with
+     plain actor nurseries (and why that's easy peasy),
+   - :doc:`/guide/cancellation` — the teardown machinery a cluster
+     inherits for free.
+
+.. _matrix channel: https://matrix.to/#/!tractor:matrix.org
+.. _#22: https://github.com/goodboy/tractor/issues/22

docs/guide/context.rst

@@ -0,0 +1,344 @@
+The ``Context``: a cross-actor task pair
+=========================================
+
+If you've written any trio_ you already know the contract: every
+task lives in a nursery, errors always propagate, cancellation is
+scoped, and nothing leaks. ``tractor`` extends that exact contract
+*across processes* — the same guarantees from the seminal
+`blog post`_, just with the nursery split across two memory
+domains. The primitive that does it is :class:`tractor.Context`: a
+**linked pair of tasks**, one in each of two actors, supervised as
+a single `structured concurrency`_ (SC) scope over IPC.
+
+.. d2:: diagrams/context_handshake.d2
+   :caption: The SC-transitive supervision protocol, msg by msg.
+   :alt: sequence diagram of the context handshake msg flow
+
+Pretty much everything else is (or is slated to be) built on this
+one primitive: ``ActorNursery.run_in_actor()`` is a convenience
+for "spawn, open a context, await the result, tear down"; plain
+``Portal.run()`` RPC is planned to be re-implemented on top of it;
+the multi-process debugger's tree-wide REPL lock rides one. Grok
+this page and the rest of the library reads as convenience
+wrappers B)
+
+The endpoint contract
+---------------------
+
+A context endpoint is an async function decorated with
+:func:`tractor.context` which declares **a param annotated**
+``tractor.Context`` — any param name you like, the annotation is
+what's required:
+
+.. code:: python
+
+    @tractor.context
+    async def trainer(
+        ctx: tractor.Context,
+        model: str,
+    ) -> str:
+        await ctx.started('ready')
+        return f'trained {model}'
+
+.. margin:: Who am I talking to?
+
+   Inside any context task
+   :func:`tractor.current_ipc_ctx` returns the
+   ``Context`` bound to the current task; handy
+   in helpers that don't take ``ctx`` explicitly.
+
+The parent (aka "opener") side invokes it through a
+:class:`tractor.Portal` using ``Portal.open_context()``, passing
+any extra kwargs which are shipped over the wire as the remote
+task's arguments. Since the target fn is referenced by module
+path, that module must be listed in the peer actor's
+``enable_modules`` allowlist — RPC capability is always opt-in.
+
+The decorator also accepts a ``pld_spec``: a type (union) which
+every payload in the dialog is validated against, upgrading your
+msgs to a typed contract enforced via :exc:`tractor.MsgTypeError`.
+Validation strictness follows the "`cheap or nasty`_"
+`(un)protocol`_ pattern: the one-shot ``Started`` payload gets the
+nasty treatment (stringently round-trip checked before it's even
+sent) while high-rate stream payloads stay cheap (checked only
+receiver side).
+
+The handshake, on the wire
+--------------------------
+
+Every context runs one instance of ``tractor``'s "SC-transitive
+supervision protocol": a tiny fixed grammar of msgspec_-typed msgs
+encapsulating *all* RPC dialogs between actors. *Transitive*
+because each IPC link obeys the same rules a local nursery does —
+starts are acked, completion is awaited, errors and cancels always
+relay — so chaining links across a process tree composes into one
+tree-wide SC scope.
+
+The figure up top shows a full dialog; in order:
+
+``Start``
+    sent by ``Portal.open_context()``: "schedule a task running
+    this function with these kwargs".
+
+``StartAck``
+    the peer runtime confirms the task is scheduled and that the
+    endpoint really is a context-style fn.
+
+``Started``
+    emitted when the child task calls
+    :meth:`tractor.Context.started`; carries the first payload
+    and unblocks the parent's entry of ``open_context()``.
+
+``Yield``
+    one per :meth:`tractor.MsgStream.send`, flowing in *either*
+    direction while a stream is open.
+
+``Stop``
+    graceful end-of-stream: the far side's ``async for``
+    terminates cleanly.
+
+``Return``
+    the child fn returned; its value becomes the context's final
+    result. If the child raised instead, an ``Error`` msg takes
+    this slot carrying the boxed traceback.
+
+``ctx.started()``: just like ``task_status.started()``
+*******************************************************
+
+The startup phase is a deliberate clone of
+:meth:`trio.Nursery.start` semantics: the child decides when it's
+"up", optionally handing back a first value, and the parent stays
+blocked until that moment:
+
+.. code:: python
+
+    # trio, in-process
+    first = await nursery.start(child_fn)
+
+    # tractor, cross-process
+    async with portal.open_context(child_fn) as (ctx, first):
+        ...
+
+The ``as (ctx, first)`` tuple is exactly that pair: the
+:class:`tractor.Context` handle plus whatever value the child
+passed to ``await ctx.started(value)``. And readiness is not
+optional — for instance opening a stream before ``.started()``
+has been called raises a ``RuntimeError``; handshake first, then
+dialog.
+
+Bidirectional streaming over a context
+--------------------------------------
+
+The canonical ping-pong (design history: `#53`_, `#223`_) — a
+full-duplex msg stream between a parent and its spawned peer:
+
+.. literalinclude:: ../../examples/rpc_bidir_streaming.py
+   :caption: examples/rpc_bidir_streaming.py
+   :language: python
+
+What's going on?
+
+- ``start_actor()`` spawns the daemon-style subactor
+  ``'rpc_server'`` with this very module in its allowlist.
+
+- ``portal.open_context(simple_rpc, data=10)`` fires the
+  ``Start`` msg then blocks until the child task calls
+  ``await ctx.started(data + 1)`` — hence ``sent == 11``.
+
+- both tasks enter ``ctx.open_stream()``: a stream dialog is only
+  fully open once *each* side has entered its block.
+
+- the parent seeds the first ``'ping'``; each side then echoes
+  the other, one ``Yield`` msg per ``stream.send()``.
+
+- after the 9th pong the parent ``break``\ s (10 pings sent in
+  total) and exits its stream block, which sends ``Stop``; the
+  child's ``async for`` completes gracefully and its ``else``
+  clause asserts all 10 pings arrived.
+
+- the 10th in-transit pong? Discarded by the implicit drain at
+  ``open_context()`` exit, which runs the dialog down to the
+  child's ``Return`` (here ``None``).
+
+- daemon actors live until told otherwise:
+  ``portal.cancel_actor()`` reaps the subactor explicitly.
+
+Results: the ``Return`` leg
+---------------------------
+
+Every context resolves to a final outcome. Wait on it explicitly
+from the parent side:
+
+.. code:: python
+
+    async with portal.open_context(ep) as (ctx, first):
+        ...
+        result = await ctx.wait_for_result()
+
+or just exit the block — ``__aexit__`` implicitly drains the msg
+flow until the ``Return`` (or ``Error``) arrives, discarding any
+in-transit ``Yield``\ s on the way. Either way the rule of
+`causality`_ holds exactly as in a local nursery: **the opener
+never unblocks before the remote task is done**.
+
+For post-hoc inspection (think supervision/restart logic) the ctx
+also exposes ``Context.outcome``, ``.maybe_error`` and
+``.has_outcome`` — where a "result" might well be the error the
+dialog ended with.
+
+Cancellation semantics
+----------------------
+
+The part you actually came for; read it twice B)
+
+A context's two tasks are **cancel-scope-linked across the IPC
+boundary**: whatever ends one side — error, cancellation, plain
+old return — is relayed such that the other side ends
+equivalently. No silent half-open dialogs, no orphaned remote
+tasks, ever.
+
+``ctx.cancel()`` cancels the *remote* task
+*******************************************
+
+:meth:`tractor.Context.cancel` requests cancellation of the
+**remote** task only:
+
+.. code:: python
+
+    async with portal.open_context(ep) as (ctx, first):
+        await accomplish_things(ctx)
+        await ctx.cancel()  # remote task, NOT me
+
+A :class:`tractor.Context` is **not** a :class:`trio.CancelScope`:
+the call doesn't (and can't) cancel your local task. It sends the
+cancel request and waits a bounded ``timeout`` for the peer
+runtime's ``CancelAck``, then your code proceeds to the block exit
+as normal.
+
+Compare scopes here: ``Portal.cancel_actor()`` is the big hammer
+which cancels the peer's **entire runtime** (and thus process);
+``ctx.cancel()`` is the per-dialog scalpel.
+
+``ContextCancelled`` and the absorption rule
+*********************************************
+
+When a context task gets cancelled *by request* the requestee's
+runtime reports back with a :exc:`tractor.ContextCancelled`
+("ctxc") whose ``.canceller`` field holds the uid of the actor
+which asked. That one field decides what you observe:
+
+**you requested it**
+    i.e. ``ctxc.canceller == tractor.current_actor().uid``: the
+    ctxc is **absorbed** at ``open_context()`` exit — nothing
+    raises in your block. You asked for a graceful stop and got
+    it; if you care, ``await ctx.wait_for_result()`` hands the
+    ctxc back as a plain *value* for inspection.
+
+**anyone else requested it**
+    the peer cancelling itself, or some third actor cancelling it
+    from the side: the ctxc **is raised** in your block. From
+    your scope's perspective a task you depend on was killed out
+    from under you and SC demands you hear about it — exactly
+    like a sibling crash in a `nursery`_.
+
+In code:
+
+.. code:: python
+
+    try:
+        async with portal.open_context(ep) as (ctx, first):
+            ...
+    except tractor.ContextCancelled as ctxc:
+        # can only be a peer- or third-party cancel;
+        # self-requested cancels are absorbed at exit.
+        assert ctxc.canceller != tractor.current_actor().uid
+
+This self- vs cross-cancel split is what makes explicit teardown
+*composable*: a supervisor cancels its dialogs without try/except
+noise, while unexpected cancellation anywhere in the tree still
+propagates loudly like any other failure.
+
+.. warning::
+
+   Once ``ctx.cancel()`` has been called the dialog is done: a
+   subsequent ``ctx.open_stream()`` raises ``RuntimeError``.
+
+For introspection the ctx exposes trio-flavored status props:
+``.cancel_called`` (this side requested), ``.cancel_acked`` (peer
+confirmed), ``.cancelled_caught`` and ``.canceller`` —
+deliberately mirroring :class:`trio.CancelScope` naming.
+
+Errors propagate, both ways
+---------------------------
+
+A crash on either end tears down the pair, SC style:
+
+- **child raises**: the exception ships back as an ``Error`` msg
+  and re-raises in the parent block boxed as a
+  :exc:`tractor.RemoteActorError`; the original class rides along
+  as ``.boxed_type`` with ``.src_uid`` naming the crashed actor.
+
+- **parent raises** (or is cancelled) inside the block: an
+  equivalent error/cancel is relayed to the child task so it can
+  never outlive the dialog.
+
+.. code:: python
+
+    try:
+        async with portal.open_context(ep) as (ctx, first):
+            ...
+    except tractor.RemoteActorError as rae:
+        if rae.boxed_type is ValueError:
+            ...  # remote ValueError, type preserved
+
+Errors that hop through intermediary actors on their way up the
+tree ("inceptions" XD) keep the full relay trail in
+``.relay_uid`` / ``.relay_path``. Payloads violating your declared
+``pld_spec`` surface as the IPC analog of a ``TypeError``:
+:exc:`tractor.MsgTypeError`.
+
+Overruns and backpressure
+-------------------------
+
+Stream msgs land in a bounded per-context buffer on the receiver
+side. A sender that outpaces a non-consuming receiver *overruns*
+it and the runtime raises ``StreamOverrun`` (from
+``tractor._exceptions``; also a :exc:`trio.TooSlowError`) instead
+of buffering without bound — SC discipline applies to memory too.
+
+Your knobs:
+
+- ``msg_buffer_size`` on ``ctx.open_stream()`` sizes the buffer.
+
+- ``allow_overruns=True`` (on ``Portal.open_context()`` and/or
+  ``ctx.open_stream()``) opts in to absorbing overflow instead of
+  erroring — reasonable for bursty telemetry-ish feeds, just know
+  you're trading the error for extra buffering.
+
+One context, one stream
+-----------------------
+
+A ``MsgStream`` is strictly **one-shot use**: once it closes —
+gracefully or not, from either side — it can never be re-opened
+on the same ctx. Want another round with the same peer? Open a
+fresh context; they're cheap. The full close-vs-cancel teardown
+story lives in :doc:`/guide/streaming`.
+
+.. rubric:: Where to next?
+
+:doc:`/guide/streaming` covers the rest of the msg-moving story:
+the legacy one-way API, multi-actor pipelines and in-actor
+broadcast fan-out. For exhaustive API detail see
+:class:`tractor.Context`, :class:`tractor.MsgStream` and
+:exc:`tractor.ContextCancelled`.
+
+.. _trio: https://github.com/python-trio/trio
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
+.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning
+.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
+.. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
+.. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
+.. _msgspec: https://jcristharif.com/msgspec/
+.. _#53: https://github.com/goodboy/tractor/issues/53
+.. _#223: https://github.com/goodboy/tractor/issues/223

docs/guide/debugging.rst

@@ -0,0 +1,545 @@
+.. _debugging:
+
+================================
+"Native" multi-process debugging
+================================
+
+``tractor`` ships the thing every ``multiprocessing`` user has
+wished for and quietly assumed was impossible: a multi-process
+debugger that *just works*.
+
+Drop ``await tractor.pause()`` — or, with `greenback`_ installed,
+a plain builtin ``breakpoint()`` — anywhere in any actor: the
+root, a child, a grandchild, a sync helper function, even an
+``asyncio`` task inside an "infected" actor. A full-featured
+`pdbp`_ REPL opens *in that process*, with syntax-highlighted
+source listings, tab completion and sticky mode, attached to your
+one terminal.
+
+Under the hood every REPL entry acquires a tree-global tty mutex
+via an IPC request to the root actor, so prompts from concurrent
+pauses and crashes never interleave. ``ctrl-c`` is shielded while
+any REPL is live, so a stray ``SIGINT`` can't vaporize the tree
+out from under you. And in debug mode any uncaught error drops
+you into a crash REPL *first in the failing child*, then again at
+each parent as the boxed :class:`~tractor.RemoteActorError` climbs
+the supervision tree.
+
+No remote-pdb sockets, no ``set_trace()`` port juggling, no
+``ptrace`` attach dance: the debugger semantics you already know,
+transparently extended across an entire process tree. Because
+``tractor`` is a `structured concurrency`_ (SC) runtime, the
+debugger composes with supervision instead of fighting it — quit
+a REPL and errors keep propagating exactly like `trio`_ taught
+you, ending in clean, zombie-free teardown.
+
+We're pretty sure it's the (first ever?) "native" debugging UX
+for multi-process Python B)
+
+Enabling debug mode
+-------------------
+
+Pass ``debug_mode=True`` to your runtime entrypoint, either
+:func:`tractor.open_nursery` (which forwards it to the implicitly
+opened root actor) or :func:`tractor.open_root_actor` directly:
+
+.. code:: python
+
+    async with tractor.open_nursery(
+        debug_mode=True,    # arm the whole actor tree
+    ) as an:
+        ...
+
+This arms the debug machinery *tree-wide*:
+
+- crash handling is enabled in every actor: uncaught errors enter
+  a REPL before they propagate,
+- the internal tty-lock module is auto-exposed over RPC to every
+  subactor (this is what makes the one-terminal handoff work),
+- console logging is bumped to include ``PDB``-level status msgs
+  so you can see REPL acquire/release events as they happen.
+
+You can instead flip it on for just one child, letting its
+siblings crash-and-burn the normal way:
+
+.. code:: python
+
+    portal = await an.start_actor(
+        'sketchy_worker',
+        debug_mode=True,    # OR-ed with the tree-wide flag
+    )
+
+See ``examples/debugging/per_actor_debug.py`` for a runnable
+proof of the selective style.
+
+.. note::
+
+   Debug mode requires the child-side runtime to be
+   ``trio``-native so that the tty-lock IPC dialog works; it's
+   currently supported on the ``'trio'`` (default) and
+   ``'main_thread_forkserver'`` spawn backends and raises
+   ``RuntimeError`` for any other ``start_method``.
+
+Your first pause point
+----------------------
+
+:func:`tractor.pause` is the SC-aware, multi-process spelling of
+the stdlib's ``breakpoint()``. In the root actor it looks almost
+boring:
+
+.. literalinclude:: ../../examples/debugging/root_actor_breakpoint.py
+   :caption: examples/debugging/root_actor_breakpoint.py
+   :language: python
+
+Run it and you get a ``(Pdb+)`` prompt parked on the ``pause()``
+line; type ``c`` (continue) and the program finishes normally.
+
+The exact same call works from *any* subactor, no matter how deep
+in the tree:
+
+.. literalinclude:: ../../examples/debugging/subactor_breakpoint.py
+   :caption: examples/debugging/subactor_breakpoint.py
+   :language: python
+
+Each loop iteration the child actor requests the terminal from
+the root over IPC, REPLs you, then releases it on ``c``. Pause
+points are re-entrant-safe: repeat calls from the same task are
+no-op'd and other local tasks queue politely for the REPL.
+
+When you get bored, type ``q`` (quit): the resulting
+``bdb.BdbQuit`` is boxed and shipped to the parent like any other
+remote error XD — causality is preserved even for your debugging
+mistakes.
+
+Crash REPLs: errors climb the tree
+----------------------------------
+
+Pause points are only half the story. With debug mode armed, any
+*uncaught* error anywhere in the tree triggers what we call crash
+handling mode:
+
+.. literalinclude:: ../../examples/debugging/subactor_error.py
+   :caption: examples/debugging/subactor_error.py
+   :language: python
+
+What happens when the child hits that (very intentional)
+``NameError``:
+
+1. a REPL opens **in the crashed child first** — you inspect the
+   raising frame, its locals, the works, right inside the failed
+   process,
+2. when you quit, the error is boxed into a
+   :class:`~tractor.RemoteActorError` and relayed to the parent,
+3. the parent (here the root) gets *its own* crash REPL with the
+   rendered remote traceback,
+4. quit again and the nursery tears the tree down — errors keep
+   propagating per SC rules, no zombies left behind.
+
+You debug the failure at every hop of the supervision tree, which
+for multi-hop trees means you can chase an error from the leaf
+that raised it all the way up to the root that supervises it.
+
+Need to skip REPL entry for certain exceptions? Pass a predicate
+via ``open_root_actor(debug_filter=...)``; by default
+cancellation-only exception (groups) don't engage the REPL.
+
+One terminal, many actors
+-------------------------
+
+So how do N processes share one tty without garbling it? The root
+actor owns stdio for the whole tree and guards it with a FIFO
+mutex; every subactor REPL entry is an IPC lock request to the
+root. Exactly one actor-task in the entire tree can own the
+terminal at a time, so prompts never interleave — ever.
+
+.. d2:: diagrams/debug_lock.d2
+   :caption: Every REPL entry serializes through the root actor's
+       tty lock; ``continue``-ing one REPL hands the terminal to
+       the next waiter, FIFO style.
+   :alt: sequence diagram of two subactors serializing pdb REPL
+       access through the root actor's tty lock
+
+The runtime's teardown paths cooperate too: a cancelling parent
+always waits for any live REPL to release before reaping
+children, so the debugger never gets yanked out from under you
+mid-keystroke.
+
+.. margin:: Watch the tree live
+
+   Run any of these examples with a process-tree watcher in a
+   second terminal and watch actors come and go::
+
+       watch -n 0.1 "pstree -a $$"
+
+Here's the showpiece: one daemon child re-entering
+``tractor.pause()`` forever inside a stream, while its sibling
+repeatedly raises a ``NameError``:
+
+.. literalinclude:: ../../examples/debugging/multi_daemon_subactors.py
+   :caption: examples/debugging/multi_daemon_subactors.py
+   :language: python
+
+What you'll actually see
+************************
+
+Running it looks *roughly* like this (uids, tracebacks and source
+listings elided; REPL order can vary with who wins the lock
+race)::
+
+    $ python examples/debugging/multi_daemon_subactors.py
+
+    Opening a pdb REPL in paused actor: ('bp_forever', '<uuid>')
+    <highlighted source around the `await tractor.pause()` line>
+    (Pdb+) c
+
+    Opening a pdb REPL in crashed actor: ('name_error', '<uuid>')
+    <live traceback: NameError: name 'doggypants' is not defined>
+    (Pdb+) q
+
+    Opening a pdb REPL in crashed actor: ('root', '<uuid>')
+    <boxed RemoteActorError traceback relayed from 'name_error'>
+    (Pdb+) q
+
+Two (then three) processes, one terminal, zero confusion:
+``c``-ing out of the paused daemon's REPL releases the tty lock,
+which immediately hands the prompt to the crashed sibling; quit
+that and the error propagates as a fully-rendered
+:class:`~tractor.RemoteActorError` to the parent where one final
+crash REPL catches it before clean, zombie-free teardown.
+
+For maximum drama run
+``multi_nested_subactors_error_up_through_nurseries.py`` (under
+``examples/debugging/``) which pulls the same trick across a
+*three-deep* process tree — the tty lock keeps every prompt
+orderly the whole way up.
+
+Post-mortem, on demand
+----------------------
+
+Crash handling is automatic, but you can also enter a REPL on
+a live exception *manually* with :func:`tractor.post_mortem` —
+the actor-aware equivalent of ``pdb.post_mortem()`` — from inside
+any ``except`` block in any actor (kwargs: ``tb=`` for an
+explicit traceback, plus ``shield=`` and ``hide_tb=``):
+
+.. literalinclude:: ../../examples/debugging/pm_in_subactor.py
+   :caption: examples/debugging/pm_in_subactor.py
+   :language: python
+
+This example demos three REPL entries from one error:
+
+- the child's manual ``post_mortem()`` inside its ``except``,
+- the runtime's automatic crash handler in the same child once
+  the error re-raises out of the RPC task,
+- a manual ``post_mortem()`` in the parent on the received
+  :class:`~tractor.RemoteActorError`, whose ``.boxed_type``
+  faithfully reports the original ``NameError``.
+
+Pausing from sync code
+----------------------
+
+No ``await``? No problem. :func:`tractor.pause_from_sync` brings
+the same tree-aware REPL to plain synchronous functions — handy
+when the suspect code is three helpers deep and decidedly not
+async.
+
+It's powered by `greenback`_, which is optional, so you need to:
+
+1. install it (it ships in ``tractor``'s ``sync_pause``
+   dependency group),
+2. enable it at runtime entry:
+
+.. code:: python
+
+    async with tractor.open_nursery(
+        debug_mode=True,
+        maybe_enable_greenback=True,
+    ) as an:
+        ...
+
+With that armed, sync code can pause from three different caller
+environments: the main ``trio`` thread, ``trio.to_thread`` bg
+threads, and (see the next section) ``asyncio`` tasks in infected
+actors. The greenback "portal" hops back into the ``trio`` loop
+to do the lock/REPL dance on your behalf:
+
+.. literalinclude:: ../../examples/debugging/sync_bp.py
+   :caption: examples/debugging/sync_bp.py (the sync fn, excerpt)
+   :language: python
+   :pyobject: sync_pause
+
+.. literalinclude:: ../../examples/debugging/sync_bp.py
+   :caption: examples/debugging/sync_bp.py (called in a subactor,
+       excerpt)
+   :language: python
+   :pyobject: start_n_sync_pause
+
+The full script also exercises the hairier root-actor bg-thread
+cases (and documents their remaining sharp edges) if you want the
+deep lore.
+
+The builtin ``breakpoint()`` override
+*************************************
+
+When debug mode boots with greenback available, ``tractor`` wires
+Python's `PEP 553`_ hook so the *builtin* ``breakpoint()`` becomes
+the actor-aware sync pause, by exporting::
+
+    PYTHONBREAKPOINT=tractor.devx.debug._sync_pause_from_builtin
+
+That means third-party and legacy code containing bare
+``breakpoint()`` calls debugs correctly inside your actor tree
+with zero edits (the override even forwards kwargs like
+``hide_tb`` to the underlying pause machinery, as shown in the
+excerpt above).
+
+.. warning::
+
+   Without greenback (or with ``maybe_enable_greenback=False``,
+   the default), ``debug_mode=True`` instead *blocks* the builtin
+   ``breakpoint()``: ``sys.breakpointhook`` is swapped for a
+   raiser and ``PYTHONBREAKPOINT=0`` is set. A naive
+   ``breakpoint()`` from some random process would clobber the
+   shared tty, so we'd rather hand you a loud ``RuntimeError``
+   with install instructions.
+
+Both the hook and the env var are restored to their prior values
+on runtime exit — see
+``examples/debugging/restore_builtin_breakpoint.py`` for the
+proof.
+
+Breakpoints inside ``asyncio`` tasks
+------------------------------------
+
+Yes, even "infected ``asyncio``" actors get the goods. Spawn a
+child with ``infect_asyncio=True`` (``trio`` runs as a guest on
+the ``asyncio`` loop inside it) and, with debug mode + greenback
+armed, every ``asyncio`` task started via ``tractor.to_asyncio``
+is automatically granted a greenback portal — so a plain builtin
+``breakpoint()`` (or ``tractor.pause_from_sync()``) inside an
+``asyncio.Task`` joins the same single-terminal, tree-locked REPL
+flow:
+
+.. literalinclude:: ../../examples/debugging/asyncio_bp.py
+   :caption: examples/debugging/asyncio_bp.py
+   :language: python
+
+Note the interleave: a ``breakpoint()`` on the ``asyncio`` side,
+``tractor.pause()`` on the ``trio`` side of the same actor, and
+another pause up in the root — all serialized through the one tty
+lock with no cross-actor (or cross-event-loop!) clobbering.
+
+One catch: ``asyncio`` tasks spawned *out-of-band* — i.e. not via
+``tractor.to_asyncio``, typically by some third-party aio lib —
+have no portal bestowed, so a sync pause from one raises a loud
+``RuntimeError`` telling you to ``greenback.ensure_portal()``
+first. See :ref:`the caveats <debugging-caveats>` below.
+
+Teardown debugging: the shielded pause
+--------------------------------------
+
+`Cancellation`_ is ``trio``'s bread and butter, which raises an
+awkward question: how do you REPL inside an *already-cancelled*
+scope, say while debugging some teardown sequence? A bare
+``pause()`` would itself be cancelled at its next checkpoint.
+
+The answer is ``await tractor.pause(shield=True)``, which wraps
+the lock acquisition and REPL session in a shielded cancel scope
+(``post_mortem(shield=True)`` works the same way):
+
+.. literalinclude:: ../../examples/debugging/shielded_pause.py
+   :caption: examples/debugging/shielded_pause.py
+   :language: python
+
+If you forget, ``tractor`` has your back: an unshielded
+``pause()`` from a cancelled scope fails fast with a hint
+suggesting ``await tractor.pause(shield=True)`` instead of
+silently never REPL-ing.
+
+Go ahead, mash ctrl-c
+---------------------
+
+While any REPL is live the runtime installs a custom ``SIGINT``
+handler tree-wide so that a reflexive ``ctrl-c`` (or five) can't
+nuke your debug session:
+
+- the actor that owns the REPL ignores the interrupt and simply
+  re-flushes the prompt — keep mashing, it's fine,
+- the root actor ignores ``SIGINT`` while a still-IPC-connected
+  child holds the tty lock, so the supervisor won't tear down the
+  tree out from under the debugger,
+- if the lock state has gone *stale* — the locking child died or
+  its IPC channel dropped — the root cancels the stale lock scope
+  and restores ``trio``'s default handler, so ``ctrl-c`` works
+  again exactly when it should.
+
+The handler is uninstalled and ``trio``'s own ``SIGINT``
+semantics restored every time a REPL releases (on ``continue`` /
+``quit``).
+
+Live task-tree dumps
+--------------------
+
+Sometimes there's no error to catch — the tree is just *hung* and
+you want to know where. For that ``tractor`` integrates
+`stackscope`_: send a signal, get a full ``trio`` task-tree dump
+from every actor in the tree.
+
+Enable it any of three ways:
+
+- ``open_root_actor(enable_stack_on_sig=True)`` (or via
+  ``open_nursery()`` which forwards it),
+- set ``TRACTOR_ENABLE_STACKSCOPE=1`` in the env — it's inherited
+  through the process tree so every (sub)actor arms the handler
+  at boot,
+- call ``tractor.devx.enable_stack_on_sig()`` directly.
+
+It's intentionally *not* gated on ``debug_mode`` so you can leave
+it armed in plain runs. Then, when the hang strikes, signal the
+tree with ``SIGUSR1``.
+
+.. tip::
+
+   No need to hunt down pids — pattern-match the original cmdline
+   with ``pkill``::
+
+       $ pkill --signal SIGUSR1 -f "python example_script.py"
+
+Each actor dumps its entire ``trio`` task tree (full nursery
+recursion via ``stackscope.extract()``) to its tty *and* tees it
+to ``/tmp/tractor-stackscope-<pid>.log`` — so the trace survives
+even under captured-stdio harnesses — then relays the signal on
+to its children, parent-before-child, until the whole tree has
+reported in.
+
+Try it yourself with the demo script, which deliberately hangs a
+subactor in a shielded sleep:
+
+.. literalinclude:: ../../examples/debugging/shield_hang_in_sub.py
+   :caption: examples/debugging/shield_hang_in_sub.py
+   :language: python
+
+(That ``trio.CancelScope(shield=True)`` hang also shows off the
+zombie reaper: ``ctrl-c`` the root and the un-cancellable child
+still gets hard-reaped — if you can create a zombie it **is a
+bug**.)
+
+Crash handling for sync and CLI code
+------------------------------------
+
+All of the above rides on the actor runtime, but crashes don't
+politely wait for ``trio.run()``. For plain sync code — think
+``typer``/``click`` CLI endpoints, config parsing, anything
+pre-runtime — there's a sync context manager that wraps the same
+``pdbp`` post-mortem UX:
+
+.. code:: python
+
+    from tractor.devx import open_crash_handler
+
+    def main():    # any sync code, no runtime required
+        with open_crash_handler() as boxed:
+            run_my_cli_thing()
+
+By default any ``BaseException`` (minus an ``ignore`` set
+defaulting to ``KeyboardInterrupt`` and ``trio.Cancelled``)
+enters the REPL then re-raises on exit; pass
+``raise_on_exit=False`` to suppress instead and introspect the
+``boxed.value`` afterward. The ``catch``/``ignore`` sets and a
+``repl_fixture`` are all tweakable.
+
+For the classic ``--pdb`` CLI-flag pattern use the conditional
+variant:
+
+.. code:: python
+
+    from tractor.devx import maybe_open_crash_handler
+
+    @app.command()    # a `typer` (or `click`) endpoint
+    def cmd(pdb: bool = False):
+        with maybe_open_crash_handler(pdb=pdb):
+            ...
+
+REPL niceties and hooks
+-----------------------
+
+Every REPL in this guide is a `pdbp`_ instance (the maintained
+fork-and-fix of `pdb++`_) pre-configured by ``tractor``:
+
+- pygments syntax highlighting in listings and tracebacks,
+- tab completion — including an automatic fixup for
+  libedit-compiled CPythons (e.g. ``uv``-distributed pythons),
+- sticky mode available via the ``sticky`` command (off by
+  default),
+- no long-line truncation (terminal resizes behave),
+- the ``(Pdb+)`` prompt, ``ll``, hidden-frames support and the
+  rest of the ``pdb++`` goodies you may already know.
+
+Internal runtime frames are traceback-hidden so the REPL lands
+exactly on *your* ``pause()``-call or crash frame, never on
+``tractor`` guts.
+
+Finally, if your app owns the terminal (TUIs, fullscreen
+dashboards) pass ``repl_fixture=<your ctx mngr>`` to ``pause()``,
+``post_mortem()`` or ``open_crash_handler()``: it's entered just
+before the REPL engages (return ``False`` to skip entry entirely)
+and exited on release — perfect for suspending and restoring your
+screen around a debug session.
+
+.. _debugging-caveats:
+
+Caveats and platform notes
+--------------------------
+
+An honest list of the current rough edges:
+
+- **Windows**: the debugger has no CI coverage on windows at all
+  (the entire test module is skipped there); manual testing has
+  shown it *can* work, but you're in uncharted territory —
+  reports welcome!
+- **macOS**: supported but with rough edges: special-cased prompt
+  re-flushing for ``bash``-on-darwin, a few tooling tests skipped
+  on CI, and the AF_UNIX ~104-char socket-path limit forces some
+  examples (like the stackscope demo above) to fall back from
+  ``'uds'`` to ``'tcp'`` transport. Wonder if all of it'll work
+  on OS X? So do we.
+- **CPython 3.14**: ``greenback`` (via ``greenlet``) doesn't
+  support 3.14 yet, so ``pause_from_sync()`` and the builtin
+  ``breakpoint()`` override are effectively 3.13-only for now.
+  The async APIs — ``pause()`` and ``post_mortem()`` — need no
+  greenback and work everywhere.
+- **out-of-band** ``asyncio`` **tasks**: sync pauses from aio
+  tasks *not* spawned via ``tractor.to_asyncio`` raise a
+  ``RuntimeError`` (no greenback portal was bestowed); run
+  ``await greenback.ensure_portal()`` inside such a task first.
+- **nested-tree ctrl-c edges**: ``SIGINT`` relay through
+  intermediary parents that aren't themselves in debug mode still
+  has known rough edges — see `#320`_.
+- **captured stdio**: ``pytest``-style output capture can hang a
+  ``pause()``; use a real terminal (or a pty à la ``pexpect``,
+  which is how ``tractor``'s own suite drives every one of these
+  examples).
+
+Where to next?
+--------------
+
+.. seealso::
+
+   - :doc:`/guide/context` — the SC-linked cross-actor task API
+     that all the crash-propagation semantics above ride on.
+   - :func:`tractor.pause`, :func:`tractor.post_mortem` and
+     :func:`tractor.pause_from_sync` in the API reference.
+   - ``examples/debugging/`` — 20-odd runnable scripts, nearly
+     every one exercised by the test suite through a real pty.
+
+.. _structured concurrency:
+   https://en.wikipedia.org/wiki/Structured_concurrency
+.. _trio: https://github.com/python-trio/trio
+.. _cancellation: https://trio.readthedocs.io/en/latest/
+   reference-core.html#cancellation-and-timeouts
+.. _pdbp: https://github.com/mdmintz/pdbp
+.. _pdb++: https://github.com/pdbpp/pdbpp
+.. _greenback: https://github.com/oremanj/greenback
+.. _stackscope: https://github.com/oremanj/stackscope
+.. _PEP 553: https://peps.python.org/pep-0553/
+.. _#320: https://github.com/goodboy/tractor/issues/320