319 changed files with 6568 additions and 42062 deletions
--- a/.claude/ai_notes/docs_todos.md
+++ b/.claude/ai_notes/docs_todos.md
@ -1,38 +0,0 @@
 # 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.
--- a/.claude/notes/rt_vars_lift_plan.md
+++ b/.claude/notes/rt_vars_lift_plan.md
@ -1,125 +0,0 @@
 # `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.
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@ -1,42 +0,0 @@
 {
  "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"
 }
--- a/.claude/skills/commit-msg/style-guide-reference.md
+++ b/.claude/skills/commit-msg/style-guide-reference.md
@ -1,225 +0,0 @@
 # 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
--- a/.claude/skills/conc-anal/SKILL.md
+++ b/.claude/skills/conc-anal/SKILL.md
@ -1,297 +0,0 @@
 ---
 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.**
--- a/.claude/skills/pr-msg/format-reference.md
+++ b/.claude/skills/pr-msg/format-reference.md
@ -1,241 +0,0 @@
 # 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
--- a/.claude/skills/run-tests/SKILL.md
+++ b/.claude/skills/run-tests/SKILL.md
@ -1,632 +0,0 @@
 ---
 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).
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -1,18 +1,10 @@
 name: CI
 # NOTE distilled from,
 # https://github.com/orgs/community/discussions/26276
 on:
-  # any time a new update to 'main'
+  # any time someone pushes a new branch to origin
  push:
    branches:
      - main
-  # for on all (forked) PRs to repo
+  # Allows you to run this workflow manually from the Actions tab
  # NOTE, use a draft PR if you just want CI triggered..
  pull_request:
  # to run workflow manually from the "Actions" tab
  workflow_dispatch:
 jobs:
@ -37,12 +29,7 @@ jobs:
        run: uv build --sdist --python=3.13
      - name: Install sdist from .tar.gz
-        # XXX must install under py3.13 (matching the build's
+        run: python -m pip install dist/*.tar.gz
        # `--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:
@ -87,49 +74,24 @@ jobs:
  #       run: mypy tractor/ --ignore-missing-imports --show-traceback
-  testing:
+  testing-linux:
-    name: '${{ matrix.os }} Python${{ matrix.python-version }} spawn_backend=${{ matrix.spawn_backend }} tpt_proto=${{ matrix.tpt_proto }}'
+    name: '${{ matrix.os }} Python ${{ matrix.python }} - ${{ matrix.spawn_backend }}'
-    timeout-minutes: 16
+    timeout-minutes: 10
    runs-on: ${{ matrix.os }}
    # Windows support is nascent: its full test suite remains
    # informational, while setup and the `import tractor` smoke below
    # are hard signals. Promote the test step to required once the
    # suite is green.
    strategy:
      fail-fast: false
      matrix:
-        os: [
+        os: [ubuntu-latest]
-          ubuntu-latest,
+        python-version: ['3.13']
          macos-latest,
          windows-latest,
        ]
        python-version: [
          '3.13',
          # '3.14',
        ]
        spawn_backend: [
          'trio',
          # 'mp_spawn',
          # 'mp_forkserver',
          # ?TODO^ is it worth it to get these running again?
          #
          # - [ ] next-gen backends, on 3.13+
          #   https://github.com/goodboy/tractor/issues/379
          # 'subinterpreter',
          # 'subint',
        ]
        tpt_proto: [
          'tcp',
          'uds',
        ]
        exclude:
          # UDS is POSIX-only; Windows has no `AF_UNIX` so the
          # backend is intentionally unavailable there.
          - os: windows-latest
            tpt_proto: 'uds'
    steps:
      - uses: actions/checkout@v4
      - name: 'Install uv + py-${{ matrix.python-version }}'
@ -155,22 +117,8 @@ jobs:
      - name: List deps tree
        run: uv tree
      # hard signal for the Windows import-safety fix: `import
      # tractor` must succeed everywhere, and `HAS_UDS` reflects
      # platform capability (False on Windows, True on POSIX).
      - name: 'Smoke: import tractor'
        run: uv run python -c "import sys; import tractor; from tractor.ipc._uds import HAS_UDS; assert sys.platform != 'win32' or not HAS_UDS; print('import tractor OK | HAS_UDS=', HAS_UDS)"
      - name: Run tests
-        continue-on-error: ${{ matrix.os == 'windows-latest' }}
+        run: uv run pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rsx
        run: >
          uv run
          pytest
          tests/
          -rsx
          --spawn-backend=${{ matrix.spawn_backend }}
          --tpt-proto=${{ matrix.tpt_proto }}
          --capture=fd
  # XXX legacy NOTE XXX
  #
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@ -1,63 +0,0 @@
 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
--- a/.gitignore
+++ b/.gitignore
@ -102,69 +102,3 @@ 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/
--- a/NEWS.rst
+++ b/NEWS.rst
@ -78,7 +78,6 @@ 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.
--- a/ai/conc-anal/fork_thread_semantics_execution_vs_memory.md
+++ b/ai/conc-anal/fork_thread_semantics_execution_vs_memory.md
@ -1,281 +0,0 @@
 # `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
--- a/ai/conc-anal/ria_nursery_removal_plan.md
+++ b/ai/conc-anal/ria_nursery_removal_plan.md
@ -1,460 +0,0 @@
 # `_ria_nursery` removal plan (issue #477 follow-up)
 Goal: drop the secondary "run-in-actor" spawn nursery (and
 friends) from `ActorNursery`/spawn internals, now that
 `tractor.to_actor.run()` delivers one-shot semantics purely on
 the daemon-spawn + portal primitives.
 ## Verified machinery map (2026-07-02, wkt @ a34aaf98)
 The entire mechanism is 4 files:
 - `runtime/_supervise.py`
  - `ActorNursery.__init__(.., ria_nursery, ..)` stores
    `._ria_nursery` (:202, :238); sole read is
    `run_in_actor()` passing `nursery=self._ria_nursery`
    (:442) into `start_actor()`'s `nursery:
    trio.Nursery|None` escape-hatch param (:305, :367).
  - `._cancel_after_result_on_exit: set` (:244) marks ria
    portals (:457).
  - `_open_and_supervise_one_cancels_all_nursery()` nests
    `da_nursery` (:609) around `ria_nursery` (:622); the
    `finally:` at the ria->da boundary (:747-766) raises
    collected `errors` (single exc or BEG).
 - `runtime/_portal.py`
  - `._expect_result_ctx` (:112) set by `_submit_for_result()`
    (:142, sole caller `run_in_actor()`); consumed by
    `wait_for_result()` (:167) + deprecated `result()` (:220).
    The `None` branch (:184-196) returns the `NoResult`
    sentinel (`_exceptions.py:1164`).
 - `spawn/_spawn.py`
  - `exhaust_portal()` (:129): awaits
    `portal.wait_for_result()`, CATCHES+RETURNS any exc
    (never raises).
  - `cancel_on_completion()` (:177): `exhaust_portal()` ->
    on exc-result stash `errors[uid] = result` (:203) ->
    ALWAYS `portal.cancel_actor()` (:218).
 - `spawn/_trio.py` (:195-222) + `spawn/_mp.py` (:187-213),
  identical shape: after shielded
  `await an._join_procs.wait()`, open a per-child local
  nursery; IFF `portal in an._cancel_after_result_on_exit`
  start `cancel_on_completion` alongside `soft_kill()`; when
  `soft_kill` returns first, `nursery.cancel_scope.cancel()`
  reaps the result-waiter.
 ## The load-bearing semantic (already-deferred errors)
 Remote ria-child errors NEVER raise into `ria_nursery`:
 1. reaper tasks only START after `_join_procs.set()` (block
   exit or the inner error handler),
 2. `exhaust_portal` swallows the exc into a return value,
 3. `cancel_on_completion` stashes it in `errors` + cancels
   that child,
 4. the ria->da `finally:` re-raises collected `errors` (and
   `an.cancel()`s any daemon stragglers).
 So mid-block there is NO error propagation from ria children
 (unless user code explicitly `await portal.wait_for_result()`s)
 — the two-nursery nesting only sequences "reap ria results
 BEFORE blocking on daemon join". A single-nursery impl only
 needs to preserve that sequencing, not any ASAP-cancel
 behavior.
 ## Target design
 ### step A: single-nursery `run_in_actor()` (mechanical)
 - `run_in_actor()` spawns via the DEFAULT (`_da_nursery`)
  path — drop `nursery=self._ria_nursery`.
 - rename `._cancel_after_result_on_exit` ->
  `._ria_portals: dict[portal, Actor]` (need the subactor ref
  for `cancel_on_completion`).
 - move reaper start-up OUT of the backends into
  `_open_and_supervise...`: immediately after EACH
  `an._join_procs.set()` call-site (happy path :642, inner
  error handler :661), start one
  `cancel_on_completion(portal, subactor, errors)` task per
  ria portal into `da_nursery`, then (happy path only)
  `await` their completion BEFORE falling out of the
  `try:`/`finally:` that raises `errors` — e.g. gather in a
  dedicated inner `trio.open_nursery()` block replacing
  today's `ria_nursery` join point.
 - delete the membership branch + local reaper nursery from
  `_trio.py`/`_mp.py` (keep the `soft_kill()` call; the
  per-child local nursery collapses to just `soft_kill`).
 - `_trio.py:310` `_children.pop()` etc. unchanged.
 ### step B: delete the plumbing
 - `_open_and_supervise...`: drop the inner
  `ria_nursery` + merge its `except BaseException` classify
  logic into ONE handler on the (now single) nursery scope;
  `ActorNursery.__init__` loses the `ria_nursery` param.
 - `start_actor()` loses the `nursery:` escape-hatch param
  (the :302-304 TODO).
 - backends: no more `_cancel_after_result_on_exit` refs.
 ### step C: (separate PRs) deprecate + migrate + excise
 - migrate in-repo `.run_in_actor()` usage to
  `to_actor.run()`: tests 46 hits/9 files (test_cancellation
  15, test_infected_asyncio 10, test_spawning 8, registrar 3,
  adv_streaming 4, pubsub 2, rpc 1, runtime 1), examples 28
  hits/13 files (debugging/* dominate), docs 20 hits/8 rst
  files. NOTE: many sites also use deprecated
  `Portal.result()`/`wait_for_result()` — these die with
  `_expect_result_ctx`, so migration must land FIRST.
 - add `DeprecationWarning` to `run_in_actor()` (+
  `_submit_for_result`/`wait_for_result`).
 - final excision: `run_in_actor()`, `_submit_for_result`,
  `_expect_result_ctx`, `wait_for_result`/`result`,
  `exhaust_portal`, `cancel_on_completion`, `NoResult`.
 ## Risk register
 1. hard-killed ria child: today the backend-local
   `nursery.cancel_scope.cancel()` discards a still-parked
   reaper when the proc dies first; a da_nursery-hosted
   reaper instead sees the transport break ->
   `exhaust_portal` returns a `TransportClosed`-ish exc ->
   NEW entry in `errors` that today gets discarded. Guard:
   reap-gather block must cancel remaining reapers once all
   ria procs are dead, or filter transport-death excs for
   already-`cancel_called` children.
 2. error-path ordering: inner handler today sets
   `_join_procs` THEN `an.cancel()`; reapers race the
   cancel-RPC. Keep that ordering when moving reaper spawn.
 3. debugger interplay: `maybe_wait_for_debugger()` calls
   (:654, :730) must stay BEFORE any reap/cancel issuance.
 4. `errors` double-entry: local body error (:646) + child's
   relayed exc (via reaper) can both land for the same
   scenario -> BEG shape changes vs today? (today has the
   same dual-write sites; keep behavior identical.)
 5. mp backend parity: mirror every `_trio.py` edit in
   `_mp.py` (identical block).
 ## Step-A first-probe findings (2026-07-02, WIP in tree)
 Step A is IMPLEMENTED (uncommitted):
 `run_in_actor()` spawns via da_nursery; new
 `_supervise._reap_ria_portals()` helper; reap awaited after
 happy-path `_join_procs.set()`; error-path runs reap
 CONCURRENT with `an.cancel()` in the shielded block;
 backends stripped of the membership branch + per-child
 reaper nursery (+ dead imports).
 Probe history (trio backend):
 - `tests/test_to_actor.py` + `tests/test_spawning.py`:
  20/20 PASS — incl. all `run_in_actor()` result
  round-trips + `test_remote_error` (single erroring child,
  body re-raise -> inner error path).
 - FIRST attempt ran the error-path reap CONCURRENT with
  `an.cancel()` (mimicking the old backend-side race):
  `test_cancellation.py::test_multierror` (2 erroring ria
  children, body re-raises one) DEADLOCKED. Root cause per
  the sequencing fix below: reap + cancel must NOT race at
  this layer (suspected `._children` pop-during-iteration
  and/or double-cancel RPC wedge; not fully root-caused
  since the fix removes the race wholesale).
 - FIX (2nd attempt, current impl): error path SEQUENCES:
  (1) snapshot ria `(portal, subactor)` pairs (backend
  `finally`s pop `._children` as procs reap), (2)
  `await an.cancel()`, (3) bounded reap over the snapshot.
  Bound was first 3s -> blew the `fail_after` deadline in
  `test_cancel_while_childs_child_in_sync_sleep` (hard-
  killed grandchild never relays => reaper parks the full
  bound). Tightened to 0.5s: anything collectable is
  already queued in the local ctx (relayed BEFORE the
  cancel); a parked reaper self-cleans (`trio.Cancelled`
  results are never stashed).
 - RESULT: `tests/test_cancellation.py` FULLY GREEN
  (20 passed, 1 xfailed, 77s); full-suite gate run kicked
  off same session (see final report/next session).
 Remaining risk: on slow CI a relayed-but-undelivered error
 racing the 0.5s bound could drop an `errors` entry
 (BEG-shape flake); if observed, scale the bound via the
 `cpu_perf_headroom()`-style approach or peek
 `Portal._final_result_msg`/ctx queue state instead of
 time-bounding.
 ## Step-B outcome (2026-07-02, done in tree)
 Step A landed as `5cd190c5` (code) + `99310269` (docs).
 Step B implemented on top (uncommitted):
 - `._ria_nursery` is GONE — the inner
  `async with (collapse_eg(), trio.open_nursery() as
  ria_nursery)` layer in
  `_open_and_supervise_one_cancels_all_nursery` is deleted;
  `da_nursery` is now the single nursery for ALL subactors.
 - `ActorNursery.__init__` drops the `ria_nursery` param +
  the `self._ria_nursery` attr; `start_actor()` drops its
  `nursery=` escape-hatch param (uses `self._da_nursery`
  directly).
 - `._cancel_after_result_on_exit` STAYS — it's the
  ria-child discriminator for `_reap_ria_portals()`.
 Deliberately NOT done (deferred to its own higher-risk PR,
 flagged with a TODO at the outer `except`): merging the two
 error handlers into one. Rationale — collapsing the empty
 nursery is provably behavior-preserving (a zero-task
 `trio.open_nursery()` only adds a checkpoint), whereas the
 inner `except BaseException` (swallow-into-`errors`) and
 outer `except (...)` (re-raise, safety-net for the inner
 handler's own non-shielded awaits) have DIFFERENT
 semantics; merging changes error/cancel propagation and
 wants isolated review + its own gate. Both handlers are
 kept, now nested directly under the single nursery.
 Why the collapse is safe: post-step-A NOTHING spawns into
 `ria_nursery` (its only reader, `run_in_actor`'s
 `nursery=self._ria_nursery`, was removed in A; the stored
 attr was never read again). So the layer was pure dead
 weight.
 Gate (trio backend, all 0-failure):
 - targeted set (`test_cancellation test_spawning test_local
  test_rpc test_to_actor`) = 49 passed, 1 xfailed.
 - tail set (`test_reg_err_types remote_exc_relay
  resource_cache ringbuf root_infect_asyncio root_runtime
  runtime shm task_broadcasting trioisms trionics/`) = 63
  passed, 1 skipped, 5 xfailed.
 - full-suite head ~73% (subdirs + `test_2way`..`test_pubsub`)
  = 303 passed before the known-flaky `test_dynamic_pub_sub`
  TooSlowError stall (pre-existing; same hang in the step-A
  full run). Suite ran slow this session (~13min vs 555s
  cold, likely thermal from back-to-back runs), never
  completing within an 800s bound — but split across the
  above three runs EVERY module passed under step B.
 ## Step-B2 outcome (2026-07-02, done in tree)
 Step B committed as `9201a2ed` (code) + `d2e812fb` (docs), then
 branched to `drop_ria_nursery`. Step B2 (the deferred
 handler-merge) implemented on top (uncommitted):
 - the two nested handlers in
  `_open_and_supervise_one_cancels_all_nursery` collapse to
  ONE `except BaseException as _scope_err` + the existing
  `finally`. The `outer_err`/`inner_err` locals go away.
 Why it's safe (trace, not hope): the OLD inner handler records
 `errors[actor.aid.uid]` as its FIRST statement (before any
 await). So whenever an error path runs, `errors` is non-empty.
 The OLD outer handler was only reachable via leakage from the
 inner handler (it catches `BaseException`, so nothing from the
 `yield` scope bypasses it) — and by then `errors` is already
 populated, so the `finally`'s `raise` from `errors` ALWAYS
 superseded the outer handler's own `raise`. i.e. the outer
 `raise` was dead. The outer handler's other effects
 (`_scope_error`, a 2nd debugger-wait, child-cancel) are
 redundant with the merged handler + `finally`. So one handler
 + `finally` is observably equivalent.
 Residual nuance (accepted): in the rare "`trio.Cancelled`
 delivered during the non-shielded `maybe_wait_for_debugger`"
 path, the merged form may leave `_cancel_called` False (cancel
 happens after the wait), so `open_nursery`'s tb-hiding guard
 (`not cancel_called and _scope_error`) can show a tb it
 previously hid. More informative, not less; no test asserts on
 it.
 Gate (box ran ~2.7x slow this session, load-induced
 `TooSlowError` flakiness on timing tests — NOT code; see
 [[env_cpu_throttle_masquerades_as_regression]]):
 - baseline (pre-B2 tip `9201a2ed`) full suite
  (`-k 'not dynamic_pub_sub'`) = 300 passed + 1
  `test_ext_types_over_ipc` `TooSlowError` that passes 6/6 in
  isolation (4.89s).
 - B2 error/cancel gate (`test_cancellation remote_exc_relay
  inter_peer_cancellation advanced_faults oob_cancellation
  to_actor spawning local rpc`) = 71 passed, 1 xfailed
  (125s).
 - B2 full-suite run: see `b2_full.log` (result appended on
  completion). RECOMMEND a clean full-suite run on a
  normal-speed box before this merges.
 ## Regression + fix: ria-reap hang (2026-07-02)
 Human hit a full-suite hang on
 `test_infected_asyncio.py::test_tractor_cancels_aio`. Bisected:
 passes at pre-ria `a34aaf98` (0.59s), hangs at B2 `e617b498`
 (90s+). Root-caused to the STEP-A reaper hoist (`5cd190c5`),
 NOT B2 (`_reap_ria_portals` is byte-identical A->B2).
 Bug: the test does `run_in_actor(asyncio_actor)` then a USER
 `portal.cancel_actor()` and exits the block cleanly -> the
 happy path's `await _reap_ria_portals()`, which waits UNBOUNDED
 on `cancel_on_completion -> wait_for_result()`. The child was
 cancelled out-of-band so no final result is relayed -> parked
 forever. The OLD spawn-backend reaper was raced against
 `soft_kill()` (per-child nursery `cancel_scope.cancel()` on
 subproc death); the hoist dropped that race.
 Fix: `_reap_ria_portals()` runs each `cancel_on_completion()`
 in a local nursery alongside a `proc.poll()` death-watch that
 cancels the parked reaper once the subproc exits — restoring
 the old race, backend-agnostic (guarded by
 `hasattr(proc, 'poll')` for a future `subint` handle).
 Why POLL (`proc.poll()`) not the event-driven `wait_func`:
 the mp waiter (`_spawn.proc_waiter`) does
 `wait_readable(proc.sentinel)`, and `soft_kill()` is ALREADY
 awaiting that same fd concurrently in the daemon nursery — a
 2nd `wait_readable` on one fd raises `trio.BusyResourceError`.
 (`trio.Process.wait()` IS multi-waiter-safe, but mp has no
 async equivalent.) `proc.poll()` — the same liveness check
 `soft_kill` itself falls back to — is the conflict-free common
 denominator. Verified: poll-fix passes on BOTH trio and
 mp_spawn.
 Also added a per-test anti-hang guard: wrapped
 `test_tractor_cancels_aio`'s `main()` in
 `with trio.fail_after(9 * cpu_perf_headroom())` — the blessed
 pattern (`pytest-timeout`'s global cap is intentionally off;
 breaks trio under fork backends, see `pyproject` NOTE). So a
 future recurrence FAILS FAST instead of hanging the suite.
 (Several other tests in the file are still guardless —
 `test_aio_simple_error`, `test_trio_error_cancels_intertask_chan`,
 `test_aio_errors_and_channel_propagates_and_closes` — candidate
 follow-up sweep.)
 Lesson: the B2 focused gate OMITTED `test_infected_asyncio`
 (and the full runs were clipped/slow), so the step-A hang
 slipped through. Any future ria-touching change MUST gate
 `test_infected_asyncio` explicitly.
 Gate: `test_tractor_cancels_aio` green (trio 1.53s, mp 3.98s);
 fix gate (`test_infected_asyncio test_cancellation test_to_actor
 test_spawning`) = 74 passed, 3 xfailed, 0 failures.
 ## PAUSED (2026-07-02): re-assess the reaper's SCOPE
 User's insight (compelling — likely the real root cause of
 the hang, not just the missing proc-death race):
 > the "hoisting" of 5cd190c5 was just not really done right
 > — the hoist should have been into the `to_actor` scope,
 > not `_supervise`.
 The argument: `.run_in_actor()`'s result-waiting/reaping got
 hoisted into `_supervise._reap_ria_portals` (nursery-machinery
 scope), which has NO natural cancel-scope to bound a parked
 `wait_for_result()` — hence the awkward proc-death race +
 the poll-vs-`proc_waiter` dilemma. If the result-wait instead
 lived in the `to_actor` one-shot scope
 (`to_actor._invoke_in_subactor()`), it would sit right next to
 the caller's `an` + a local `trio` task-nursery + cancel-scope
 (the `trio.to_thread`-style model #477 actually wants) — so
 bounding/cancelling the wait is trivial and the hang
 dissolves from correct scoping rather than a bolt-on race.
 Follow-on to re-evaluate on resume:
 - should `_reap_ria_portals` exist AT ALL, or should
  result-waiting move entirely into
  `to_actor._invoke_in_subactor()`?
 - reimplement legacy `run_in_actor()` on top of
  `to_actor.run()` so `_reap_ria_portals` +
  `_cancel_after_result_on_exit` can be DROPPED from
  `_supervise` entirely (the true #477 simplification)?
 - the poll-vs-event decision is MOOT under this re-scoping.
 State at pause: `test_infected_asyncio` anti-hang guard
 COMMITTED (`d1fb4a1a`, intentionally red w/o the fix — the
 user's failing-test-first convention). The poll-based reap
 fix in `_supervise.py` is UNCOMMITTED and likely SUPERSEDED
 by the re-scoping — do NOT land it as-is.
 ## RESOLVED (2026-07-06): migrate everything, remove the API
 The PAUSED re-assessment concluded decisively: rather than
 re-scope `_reap_ria_portals` (or bolt any hack onto it), the
 `run_in_actor()` API itself was REMOVED — its non-blocking
 "result at teardown" semantic predates streaming and confused
 more than it served. Every in-repo caller was migrated
 per-file/-group (each its own commit, each gated):
 - tests: `test_infected_asyncio` `test_runtime` `test_rpc`
  `test_spawning` `test_pubsub` `test_registrar`
  `test_cancellation` (3 groups) `test_advanced_streaming`.
 - examples: 4 non-debugging + all 8 `debugging/` REPL scripts
  (debugger suite byte-identical green, 28p/6s).
 - docs: 8 rst pages + the `experimental/_pubsub` docstring.
 Migration patterns (the `run_in_actor` shape -> successor):
 - blocking result        -> `to_actor.run(fn, an=an, ...)`
 - fire-&-forget/forever  -> bg `to_actor.run()` task in a local
                            `trio` task-nursery (or `start_actor`
                            + bg `Portal.run()` when a portal
                            handle is needed)
 - concurrent fan-out     -> N bg `to_actor.run()` tasks / or
                            `gather_contexts([p.open_context(..)])`
 - reap-all-error-collect -> the "collect don't cancel" pattern:
                            each one-shot catches + stashes its
                            `RemoteActorError`, group raised
                            after the task-nursery joins (see
                            `examples/debugging/multi_subactors.py`)
 - mutual-rendezvous      -> peers must OUTLIVE both dialogs:
                            `start_actor()` daemons + concurrent
                            `Portal.run()`s + explicit
                            `an.cancel()` (eager one-shot reap
                            races the slower peer's dial of the
                            winner's dead sockaddr; found via
                            `test_trynamic_trio` flake).
 Semantic deltas (tests loosened accordingly):
 - teardown-reap-all BEG-of-N is GONE: local task-nurseries are
  cancel-on-first, raced siblings' `Cancelled`s are absorbed,
  and the runtime's `collapse_eg()` unwraps every single-member
  group at each actor boundary — a fully-raced nested tree
  relays a bare (annotated) `RemoteActorError` chain.
 - `test_multierror_fast_nursery` deleted (pure reap-stress);
  `test_nested_multierrors` re-purposed as deep-tree
  cancel-cascade stress w/ a race-tolerant shape walk.
 Final excision (after zero callers remained): `run_in_actor()`,
 `._cancel_after_result_on_exit`, `_reap_ria_portals()`,
 `Portal._submit_for_result/._expect_result_ctx/
 .wait_for_result()/.result()`, `exhaust_portal()`,
 `cancel_on_completion()`, `NoResult` — net -402 lines. The
 reap-hang class (unbounded `wait_for_result` in machinery
 scope) dissolves structurally: the only result-wait left lives
 in the caller's task inside its own cancel-scope; the
 `d1fb4a1a` anti-hang guard test passes by construction. The
 poll-vs-`proc_waiter` debate is moot as predicted.
 ## Follow-up sketch: `to_actor.open_one_shot()` (run-async parity)
 If deferred-result parity is ever wanted, the design that needs
 NO runtime coupling, NO returned `Portal` and NO cancel-relay
 `trio.Event` machinery:
    async with to_actor.open_one_shot(
        fn, an=an, **kws,
    ) as one_shot:
        ...                       # concurrent caller work
        val = await one_shot.wait()   # optional; errors always
                                      # propagate at scope exit
 an `@acm` that opens a private task-nursery, `start_soon`s ONE
 task running the existing blocking `run()` and stashes the
 value in a slot + sets a done-`trio.Event` (a memo, not a
 cancel relay). Cancellation = plain scope-cancel of the acm's
 nursery (the parked `Portal.run()` unwinds via `Cancelled`, the
 shielded `cancel_actor()` reap still runs); a child error
 raises into the acm scope so an un-`wait()`ed one-shot can
 never silently drop its error. i.e. the old reaper's job is
 done by scoping, not machinery. ~40 lines, all in
 `to_actor/_api.py`, zero `_supervise` involvement.
 ## Verification gate
 - per-migration-commit module gates on `trio` (+ `mp_spawn`
  spot-gates incl. `test_infected_asyncio` per the B2 lesson);
  `tests/devx/test_debugger.py` for the REPL flows.
 - full suite on `trio` + `mp_spawn` at branch tip + CI matrix
  via draft PR #484.
--- a/ai/conc-anal/spawn_time_boot_death_dup_name_issue.md
+++ b/ai/conc-anal/spawn_time_boot_death_dup_name_issue.md
@ -1,142 +0,0 @@
 # 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`.
--- a/ai/conc-anal/test_register_duplicate_name_daemon_connect_race_issue.md
+++ b/ai/conc-anal/test_register_duplicate_name_daemon_connect_race_issue.md
@ -1,273 +0,0 @@
 # `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.
--- a/ai/conc-anal/trio_033_cancel_cascade_slowdown_depth3_issue.md
+++ b/ai/conc-anal/trio_033_cancel_cascade_slowdown_depth3_issue.md
@ -1,102 +0,0 @@
 # `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`.
--- a/ai/conc-anal/trio_wakeup_socketpair_busy_loop_under_fork_issue.md
+++ b/ai/conc-anal/trio_wakeup_socketpair_busy_loop_under_fork_issue.md
@ -1,221 +0,0 @@
 # 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`
--- a/ai/prompt-io/claude/20260406T172848Z_02b2ef1_prompt_io.md
+++ b/ai/prompt-io/claude/20260406T172848Z_02b2ef1_prompt_io.md
@ -1,54 +0,0 @@
 ---
 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).
--- a/ai/prompt-io/claude/20260406T193125Z_85f9c5d_prompt_io.md
+++ b/ai/prompt-io/claude/20260406T193125Z_85f9c5d_prompt_io.md
@ -1,57 +0,0 @@
 ---
 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).
--- a/ai/prompt-io/claude/20260406T222648Z_f086222_prompt_io.md
+++ b/ai/prompt-io/claude/20260406T222648Z_f086222_prompt_io.md
@ -1,52 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260406T222648Z_f086222_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260406T222648Z_f086222_prompt_io.raw.md
@ -1,32 +0,0 @@
 ---
 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()`)
--- a/ai/prompt-io/claude/20260413T192116Z_f851f28_prompt_io.md
+++ b/ai/prompt-io/claude/20260413T192116Z_f851f28_prompt_io.md
@ -1,74 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260413T205048Z_269d939c_prompt_io.md
+++ b/ai/prompt-io/claude/20260413T205048Z_269d939c_prompt_io.md
@ -1,50 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260413T205048Z_269d939c_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260413T205048Z_269d939c_prompt_io.raw.md
@ -1,32 +0,0 @@
 ---
 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).
--- a/ai/prompt-io/claude/20260414T163300Z_befedc49_prompt_io.md
+++ b/ai/prompt-io/claude/20260414T163300Z_befedc49_prompt_io.md
@ -1,38 +0,0 @@
 ---
 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`
--- a/ai/prompt-io/claude/20260414T163300Z_befedc49_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260414T163300Z_befedc49_prompt_io.raw.md
@ -1,62 +0,0 @@
 ---
 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).
--- a/ai/prompt-io/claude/20260417T034918Z_9703210_prompt_io.md
+++ b/ai/prompt-io/claude/20260417T034918Z_9703210_prompt_io.md
@ -1,101 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260417T034918Z_9703210_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260417T034918Z_9703210_prompt_io.raw.md
@ -1,117 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260417T035800Z_61a73ba_prompt_io.md
+++ b/ai/prompt-io/claude/20260417T035800Z_61a73ba_prompt_io.md
@ -1,86 +0,0 @@
 ---
 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).
--- a/ai/prompt-io/claude/20260417T035800Z_61a73ba_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260417T035800Z_61a73ba_prompt_io.raw.md
@ -1,138 +0,0 @@
 ---
 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`.
--- a/ai/prompt-io/claude/20260601T231429Z_0e3e008b_prompt_io.md
+++ b/ai/prompt-io/claude/20260601T231429Z_0e3e008b_prompt_io.md
@ -1,146 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260601T231429Z_0e3e008b_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260601T231429Z_0e3e008b_prompt_io.raw.md
@ -1,106 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.md
+++ b/ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.md
@ -1,93 +0,0 @@
 ---
 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).
--- a/ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.raw.md
@ -1,49 +0,0 @@
 ---
 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).
--- a/ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.md
+++ b/ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.md
@ -1,65 +0,0 @@
 ---
 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`).
--- a/ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.raw.md
@ -1,35 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.md
+++ b/ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.md
@ -1,64 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.raw.md
@ -1,35 +0,0 @@
 ---
 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.
--- a/ai/prompt-io/claude/20260702T154255Z_65bf9df5_prompt_io.md
+++ b/ai/prompt-io/claude/20260702T154255Z_65bf9df5_prompt_io.md
@ -1,79 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 session: f6c84722-471a-4458-9a80-e453fea9029f
 timestamp: 2026-07-02T15:42:55Z
 git_ref: 65bf9df5
 scope: code
 substantive: true
 raw_file: 20260702T154255Z_65bf9df5_prompt_io.raw.md
 ---
 ## Prompt
 Driver prompt file `ai/prompt-io/prompts/issue_477.md`:
 > attempt to resolve
 > https://github.com/goodboy/tractor/issues/477
 > do it with /open-wkt.
 (plus a hard stop-for-human-review deadline of 12:50PM
 EST the same day)
 Issue #477 asks to factor `ActorNursery.run_in_actor()`
 (and possibly `Portal.run()`) out of the nursery
 internals into a new `tractor.to_actor` wrapper
 subpackage of "higher level one shot" single-remote-task
 APIs, adopting the `trio.to_thread`/`anyio.to_process`
 parlance, so that error collection/propagation moves up
 into the caller's local `trio` scope and the nursery's
 spawn machinery can eventually drop the
 `._ria_nursery` coupling.
 ## Response summary
 First-cut `tractor.to_actor` subpkg delivering the
 one-shot API composed purely from the existing
 daemon-spawn + portal primitives (`start_actor()` +
 `Portal.run()` + `Portal.cancel_actor()`), leaving the
 legacy `.run_in_actor()` machinery untouched (formal
 deprecation deferred until in-repo usage migrates):
 - `to_actor.run(fn, **fn_kwargs) -> Any`: spawn a
  subactor, schedule `fn` as its lone remote task, wait
  on and return its result, ALWAYS reaping the subactor
  (shield-safe `finally`). Remote errors raise in the
  caller's task as boxed `RemoteActorError`s.
 - placement variants: `portal=` reuses a running actor
  (no spawn/reap), `an=` spawns from a caller-managed
  actor-nursery, neither opens a call-scoped private
  `open_nursery()` (implicitly booting the runtime,
  configurable via `runtime_kwargs`).
 - fail-fast validation before any spawn: non-streaming
  async fn required; `portal=`/`an=` mutually
  exclusive; `runtime_kwargs` rejected alongside any
  placement opt.
 - `run_in_actor()` TODO/docstring now cross-reference
  the successor API.
 ## Files changed
 - `tractor/to_actor/__init__.py` — new subpkg,
  re-exports `run`
 - `tractor/to_actor/_api.py` — `run()` +
  `_invoke_in_subactor()` + `_validate_one_shot_fn()`
 - `tractor/__init__.py` — top-level `to_actor`
  re-export
 - `tractor/runtime/_supervise.py` — comment/docstring
  pointers from `run_in_actor()` to the successor
 - `tests/test_to_actor.py` — 11-test suite covering
  all placement variants, error relay, the concurrent
  worker-pool-ish pattern and arg validation
 - `examples/parallelism/to_actor_one_shots.py` —
  runnable demo (auto-collected by
  `test_docs_examples.py`)
 ## Human edits
 None yet — pending human review (work paused before the
 12:50PM EST deadline per the driver prompt).
--- a/ai/prompt-io/claude/20260702T154255Z_65bf9df5_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260702T154255Z_65bf9df5_prompt_io.raw.md
@ -1,100 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 timestamp: 2026-07-02T15:42:55Z
 git_ref: 65bf9df5
 diff_cmd: git diff main..wkt/to_actor_subpkg
 ---
 # Raw AI output (diff-ref mode)
 All generated code is committed on the
 `wkt/to_actor_subpkg` branch; per diff-ref mode each
 file's verbatim content is reachable via the pointers
 below rather than duplicated here.
 ## Generated files
 > `git diff main..wkt/to_actor_subpkg -- tractor/to_actor/__init__.py`
 New subpackage init: module docstring establishing the
 `trio.to_thread`/`anyio.to_process` "run it over there"
 parlance for actors, plus the single public re-export
 `run as run` from `._api`.
 > `git diff main..wkt/to_actor_subpkg -- tractor/to_actor/_api.py`
 The one-shot invocation impl, composed entirely from the
 lower level daemon-spawn + portal primitives as
 prescribed by issue #477:
 - `_validate_one_shot_fn()`: the `Portal.run()`
  non-streaming-async-fn constraint checked up-front,
  before any subactor is spawned.
 - `_invoke_in_subactor()`: `an.start_actor()` ->
  `Portal.run()` -> always-reap via
  `Portal.cancel_actor()` in a `finally` (the cancel
  req's bounded wait is internally shielded so the reap
  also runs under caller-scope cancellation).
 - `run()`: the public API. Placement options:
  `portal=` (reuse a running actor, no spawn/reap),
  `an=` (spawn from a caller-managed nursery), or
  neither (private `open_nursery()` scoped to the call,
  implicitly booting the runtime when needed, tunable
  via pass-through `runtime_kwargs`). Spawn opts mirror
  `ActorNursery.start_actor()`; `**fn_kwargs` are
  relayed to the remote task. Errors raise in the
  caller's task as boxed `RemoteActorError`s.
  `runtime_kwargs` alongside any placement opt is a
  hard `ValueError`, never silently ignored.
 > `git diff main..wkt/to_actor_subpkg -- tractor/__init__.py`
 Top-level `from . import to_actor as to_actor`
 re-export.
 > `git diff main..wkt/to_actor_subpkg -- tractor/runtime/_supervise.py`
 Comment/docstring-only: the `run_in_actor()` deprecation
 TODO now points at the implemented `.to_actor.run()`
 successor (checkbox ticked) and the method docstring
 gains a NOTE steering users to the new API; remaining
 TODO items are the `DeprecationWarning` emission +
 in-repo usage migration.
 > `git diff main..wkt/to_actor_subpkg -- tests/test_to_actor.py`
 11-test suite: private-nursery one-shot, implicit
 runtime boot via `runtime_kwargs`, remote-error relay to
 the caller's task (bare + caller-managed nursery),
 caller-nursery spawn, portal reuse w/o implicit reap,
 the concurrent worker-pool-ish pattern (local `trio`
 nursery x shared `an`), and the four validation
 rejections (sync fn, async-gen fn, `portal`+`an`
 combo, `runtime_kwargs`+placement combo).
 > `git diff main..wkt/to_actor_subpkg -- examples/parallelism/to_actor_one_shots.py`
 Runnable example (auto-collected by
 `test_docs_examples.py`): the fully-implicit one-shot
 plus the concurrent worker-pool-ish prime-check pattern
 against a shared caller-managed actor-nursery.
 ## Test runs (verbatim)
 ```
 tests/test_to_actor.py ..........                [100%]
 ============= 10 passed in 4.29s =============
 ```
 Regression subset for touched modules
 (`test_local.py test_rpc.py test_spawning.py
 test_cancellation.py`):
 ```
 38 passed, 1 xfailed, 24 warnings in 80.71s (0:01:20)
 ```
 (warnings are pre-existing stdlib `os.fork()`
 DeprecationWarnings from the mp spawn backends, not
 introduced by this change)
--- a/ai/prompt-io/claude/20260702T155006Z_65bf9df5_prompt_io.md
+++ b/ai/prompt-io/claude/20260702T155006Z_65bf9df5_prompt_io.md
@ -1,77 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 session: b8ec2ffe-1e47-4db5-8bc3-5bebc5feaaf6
 timestamp: 2026-07-02T15:50:06Z
 git_ref: 65bf9df5
 scope: code
 substantive: true
 raw_file: 20260702T155006Z_65bf9df5_prompt_io.raw.md
 ---
 ## Prompt
 From `ai/prompt-io/prompts/issue_473.md`:
 > NOTE: you MUST pause this work at 12:50PM EST (BEFORE
 > your weekly limit reset) for review by a human!
 >
 > resolve GH #473: https://github.com/goodboy/tractor/issues/474
 > do it with /open-wkt.
 (The prompt's issue-number/URL mismatch was resolved in
 favor of #473 — file name, session name and prompt text
 all say #473; the `/474` URL is a typo.)
 GH #473: "Root-cause UDS-on-macOS —
 `uds_transport_actor_tree` example fails on CI".
 ## Response summary
 Worked all four #473 next-step checkboxes in wkt
 `uds_macos_473`:
 1. **stderr surfacing**: `test_docs_examples.py` now
   raises with the full subproc stderr (+stdout) on ANY
   non-zero exit. The old last-line-'Error' check could
   never fire for `tractor` crashes since root-actor
   stderr always ends with the strict-EG collapse note
   `( ^^^ this exc was collapsed from a group ^^^ )` —
   proven against the real PR #460 macOS CI log (bare
   `assert 1 == 0`, no traceback).
 2. **root-cause (linux-provable layer)**: macOS-only
   addr corruption in
   `MsgpackUDSStream.get_stream_addrs()` — no
   `SO_PASSCRED`/autobind on darwin means the accept
   side's `getpeername()` is `''`, and the
   `(str(), str())` arm took `peername` unconditionally →
   `Path('')` garbage addrs on every accepted conn.
   Proven + fixed via linux no-autobind simulation.
   Possibly not the final macOS crasher (non-fatal on
   linux-sim); the diagnostic patch guarantees the next
   macOS CI run shows any remaining layer.
 3. **CI matrix**: removed the `macos-latest`+`uds`
   exclude.
 4. **un-skip**: dropped the macOS+CI skip of the example.
 Also: `start_listener()` bindspace mkdir hardened
 (`parents=True, exist_ok=True`), example docstring
 peer-pid mechanism corrected for macOS.
 ## Files changed
 - `tests/test_docs_examples.py` — surface full stderr on
  non-zero exit; remove macOS skip of the UDS example
 - `tractor/ipc/_uds.py` — fix no-autobind
  `get_stream_addrs()` arm; harden bindspace mkdir;
  document autobind semantics
 - `.github/workflows/ci.yml` — add macOS UDS leg (remove
  matrix exclude)
 - `examples/uds_transport_actor_tree.py` — platform-
  correct peer-pid docs
 ## Human edits
 None yet — pending human review (hard-stop review
 checkpoint at 12:50PM EST per prompt); commit staging and
 any edits are the human's.
--- a/ai/prompt-io/claude/20260702T155006Z_65bf9df5_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260702T155006Z_65bf9df5_prompt_io.raw.md
@ -1,101 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 timestamp: 2026-07-02T15:50:06Z
 git_ref: 65bf9df5
 diff_cmd: git diff main..wkt/uds_macos_473
 ---
 # Raw output — GH #473 UDS-on-macOS root-cause session
 NOTE: code output is diff-referenced (not copied) per
 prompt-io diff-ref mode; all generated code is on branch
 `wkt/uds_macos_473` relative to `main` (65bf9df5).
 ## Diagnostic narrative (verbatim)
 Root-cause work proceeded by linux-side simulation since no
 macOS host is available:
 1. Pulled the actual macOS CI failure log from PR #460 run
   28343878933 (job 84115107992): the failure is a bare
   `assert 1 == 0` on `proc.returncode` with NO stderr
   surfaced — the harness only re-raised when the LAST
   stderr line contained 'Error'.
 2. Reproduced the stderr-swallow mechanism on linux: any
   `tractor` root-actor crash ends stderr with the
   strict-EG collapse note
   `( ^^^ this exc was collapsed from a group ^^^ )` which
   never matches 'Error' — so EVERY possible crash was
   swallowed. (Verified by sabotaging the runtime dir via
   an over-long `XDG_RUNTIME_DIR` → `OSError: AF_UNIX path
   too long` → rc=1 + swallowed.)
 3. Found + proved a macOS-only addr-corruption bug in
   `MsgpackUDSStream.get_stream_addrs()`: the
   `(str(), str())` match-arm unconditionally took
   `peername`, but on no-autobind platforms (macOS lacks
   linux's `SO_PASSCRED`-triggered autobind) the accept
   side's `getpeername()` is `''` → `Path('')` garbage
   laddr/raddr on EVERY accepted UDS conn. Simulated on
   linux by nulling `SO_PASSCRED` (no autobind → same `''`
   shape): pre-fix the example printed
   `listener sock file: .`; post-fix it prints the real
   registry sockpath. Non-fatal on linux-sim (rc=0), so
   possibly not the final macOS crasher — the diagnostic
   patch guarantees the next macOS CI run reveals any
   remaining layer.
 4. Falsified the missing-parent-dir theory:
   `get_rt_dir()` already `mkdir(parents=True,
   exist_ok=True)`s at import (and macOS TCP CI passes),
   so `~/Library/Caches/TemporaryItems` absence cannot be
   the crasher. Hardened `start_listener()`'s bindspace
   mkdir anyway (custom `filedir` case + racing actors).
 ## Generated changes (diff pointers)
 > `git diff main..wkt/uds_macos_473 -- tests/test_docs_examples.py`
 - always raise with FULL subproc stderr (+stdout) on any
  non-zero example exit; keep legacy last-line 'Error'
  check for zero-rc cases; drop the macOS+CI skip of
  `uds_transport_actor_tree.py` (GH #473 next-step).
 > `git diff main..wkt/uds_macos_473 -- tractor/ipc/_uds.py`
 - `get_stream_addrs()`: document the autobind semantics
  (bytes = linux abstract-ns autobind artifact), add
  no-autobind `(str, str)` arm picking the non-empty name
  (`peername` connect-side, `sockname` accept-side) with
  an empty-pair `ValueError` guard.
 - `start_listener()`: `bs.mkdir(parents=True,
  exist_ok=True)`.
 > `git diff main..wkt/uds_macos_473 -- .github/workflows/ci.yml`
 - remove the `macos-latest`+`uds` matrix exclude so
  UDS-on-macOS is exercised by CI (GH #473 next-step).
 > `git diff main..wkt/uds_macos_473 -- examples/uds_transport_actor_tree.py`
 - docs nit: peer-pid mechanism is `SO_PEERCRED` on linux,
  `LOCAL_PEERPID` on macOS.
 ## Verification (verbatim summary)
 - macOS-shape sim (no autobind) + fix: example rc=0 with
  correct listener sockpath.
 - native linux post-fix: example rc=0, autobind arms
  unchanged.
 - sabotage smoke-test: diagnostic patch surfaces the full
  EG traceback incl. collapse-note line.
 - `pytest tests/ipc/ tests/test_2way.py tests/discovery/
  --tpt-proto uds`: 61 passed, 1 `TooSlowError` flake
  (test_simple_rpc) that passes solo in 2.2s — attributed
  to a concurrent full-suite run (other session) loading
  the host.
 - full `tests/test_docs_examples.py` run pending at
  raw-file write time (queued behind the concurrent
  session's suite).
--- a/ai/prompt-io/claude/20260702T155626Z_65bf9df5_prompt_io.md
+++ b/ai/prompt-io/claude/20260702T155626Z_65bf9df5_prompt_io.md
@ -1,83 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 session: b6b42e23-0454-4d9b-be1c-0a89d65aed1b
 timestamp: 2026-07-02T15:56:26Z
 git_ref: 65bf9df5
 scope: code
 substantive: true
 raw_file: 20260702T155626Z_65bf9df5_prompt_io.raw.md
 ---
 ## Prompt
 From `ai/prompt-io/prompts/issue_470.md`:
 > attempt to resolve
 > https://github.com/goodboy/tractor/issues/470
 > do it with /open-wkt, ensure you /run-tests on all
 > changes
 (plus a hard pause-for-human-review deadline of
 12:50PM EST.)
 Issue #470 asks to trim the ~0.42s `import tractor`
 cost — which dominates per-actor spawn latency on the
 `trio` backend — by lazy-importing heavy/optional deps
 (`pdbp`, `stackscope`, `multiaddr`, + audit of
 `colorlog`/`bidict`/`wrapt`/`setproctitle`).
 ## Response summary
 Profiling showed the issue's dep-list only accounted
 for ~20ms; the dominant cost (~244ms) was
 `log.get_logger()`'s `get_caller_mod()` calling
 `inspect.stack()` at module level in ~39 modules —
 each call walks every stack frame (deep during nested
 imports) and scans `sys.modules` per frame via
 `inspect.getmodule()`.
 Changes, in impact order:
 1. `get_caller_mod()` -> `sys._getframe()` +
   `f_globals['__name__']` `sys.modules` lookup
   (~240ms saved).
 2. Issue's lazy-import checklist: `bidict`,
   `multiaddr`, `colorlog`, `wrapt` moved to
   `TYPE_CHECKING`/function-local imports;
   `platformdirs` function-local; `asyncio` +
   `.to_asyncio` deferred out of the `devx.debug` +
   `spawn._entry` eager paths (~15ms saved).
 3. PEP 562 `__getattr__` on `tractor/__init__.py`
   preserving public `tractor.to_asyncio` attr access.
 Results: `import tractor` 0.42s -> ~0.145s (~65%);
 sequential `start_actor` latency 0.40-0.44s ->
 ~0.179s/actor. `pdbp` (needs `_repl.py` class-base
 restructure) + `platformdirs` (needs
 `UDSAddress.def_bindspace` protocol rework) documented
 as follow-ups.
 ## Files changed
 - `tractor/log.py` — `get_caller_mod()` perf fix +
  lazy `colorlog`
 - `tractor/__init__.py` — PEP 562 lazy `to_asyncio`
 - `tractor/discovery/_addr.py` — `bidict` ->
  `TYPE_CHECKING`
 - `tractor/discovery/_multiaddr.py` — lazy `multiaddr`
 - `tractor/ipc/_tcp.py`, `tractor/ipc/_uds.py` —
  `Multiaddr` -> `TYPE_CHECKING`
 - `tractor/runtime/_state.py` — lazy `platformdirs`
 - `tractor/devx/_frame_stack.py` — lazy `pdbp` +
  `wrapt`
 - `tractor/devx/debug/_trace.py`,
  `tractor/devx/debug/_tty_lock.py` — lazy `asyncio` +
  `.to_asyncio`
 - `tractor/spawn/_entry.py` — lazy
  `run_as_asyncio_guest`
 ## Human edits
 None yet — pending user review at the 12:50PM EST
 pause gate (test-suite results reported in-session).
--- a/ai/prompt-io/claude/20260702T155626Z_65bf9df5_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260702T155626Z_65bf9df5_prompt_io.raw.md
@ -1,122 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 timestamp: 2026-07-02T15:56:26Z
 git_ref: 65bf9df5
 diff_cmd: git diff main..wkt/boot_latency_470
 ---
 # Raw AI output — gh #470 `import tractor` latency trim
 All generated code is committed on the
 `wkt/boot_latency_470` branch; per diff-ref mode each
 file's content is referenced via its diff instead of
 copied verbatim.
 ## Profiling findings (verbatim analysis output)
 Baseline: `import tractor` ~0.39-0.42s wall.
 `python -X importtime` + `cProfile` traced the cost NOT
 primarily to third-party deps (the issue's hypothesis)
 but to `tractor/log.py:get_logger()` calling
 `get_caller_mod()` -> `inspect.stack()` at module level
 in ~39 tractor modules:
 - `inspect.stack()` builds `FrameInfo` (incl. src-file
  and line-context resolution) for EVERY frame on the
  stack; during nested imports the stack is dozens of
  importlib frames deep.
 - each `FrameInfo` resolution calls
  `inspect.getmodule()` which scans all of
  `sys.modules` per frame (1.4M `ismodule()` calls in
  one profiled import).
 - aggregate: ~244ms of tractor-own module "self" time
  vs ~20ms for ALL the issue-listed third-party deps
  (`pdbp` ~10ms, `bidict` ~4.5ms, `multiaddr` ~3.5ms,
  `wrapt`/`colorlog` ~1ms each); `trio` itself is
  ~70-100ms and unavoidable.
 ## Generated changes
 > `git diff main..wkt/boot_latency_470 -- tractor/log.py`
 `get_caller_mod()` rewritten from `inspect.stack()` +
 `inspect.getmodule()` to `sys._getframe(frames_up)` +
 `frame.f_globals['__name__']` -> `sys.modules` lookup
 (O(1) vs O(stack x sys.modules)). Unused `inspect`
 imports dropped; `FrameType` imported from `types`.
 Also `colorlog` lazy-imported inside
 `get_console_log()`.
 > `git diff main..wkt/boot_latency_470 -- tractor/discovery/_addr.py`
 `bidict` import moved under `TYPE_CHECKING`
 (annotation-only use; `_address_types` is a plain dict
 literal).
 > `git diff main..wkt/boot_latency_470 -- tractor/discovery/_multiaddr.py`
 `from __future__ import annotations` added; `multiaddr`
 import moved under `TYPE_CHECKING` + function-local
 imports in `mk_maddr()`/`parse_maddr()`.
 > `git diff main..wkt/boot_latency_470 -- tractor/ipc/_tcp.py tractor/ipc/_uds.py`
 `Multiaddr` imports moved under `TYPE_CHECKING`
 (annotation-only in both transports).
 > `git diff main..wkt/boot_latency_470 -- tractor/runtime/_state.py`
 `platformdirs` lazy-imported inside `get_rt_dir()`
 (NOTE: still imported eagerly via
 `UDSAddress.def_bindspace` class-var eval; see
 follow-ups).
 > `git diff main..wkt/boot_latency_470 -- tractor/devx/_frame_stack.py`
 `pdbp` + `wrapt` lazy-imported inside
 `hide_runtime_frames()` / `api_frame()` respectively.
 > `git diff main..wkt/boot_latency_470 -- tractor/devx/debug/_trace.py tractor/devx/debug/_tty_lock.py`
 `asyncio` moved to `TYPE_CHECKING` + call-site local
 imports (`asyncio.current_task()` sites);
 `tractor.to_asyncio.run_trio_task_in_future` imports
 moved into the infected-aio runtime branches.
 > `git diff main..wkt/boot_latency_470 -- tractor/spawn/_entry.py`
 `run_as_asyncio_guest` import moved into the
 `infect_asyncio=True` branches of `_mp_main()` /
 `_trio_main()`.
 > `git diff main..wkt/boot_latency_470 -- tractor/__init__.py`
 PEP 562 module `__getattr__` added so
 `tractor.to_asyncio` attr-access still works (required
 by `tests/test_child_manages_service_nursery.py` and
 any downstream user) while keeping `asyncio` off the
 eager import path.
 ## Measured results (verbatim)
 - `import tractor`: 0.39-0.42s -> ~0.145s (~65% cut)
 - `start_actor` spawn+boot+reg+cancel: ~0.40-0.44s ->
  ~0.179s/actor (n=5 sequential, warm parent)
 - post-change eager-module check: only `pdbp` +
  `platformdirs` of the issue's list remain eager.
 ## Known follow-ups (not implemented, deadline-bound)
 - `pdbp` (~10ms): still eager via
  `devx/debug/_repl.py` class bases
  (`class PdbREPL(pdbp.Pdb)`) + `_tty_lock.py`
  module-level `@pdbp.hideframe`; needs `_repl`
  restructure + PEP 562 in `devx.debug.__init__`.
 - `platformdirs` (~1.5ms): eager via
  `UDSAddress.def_bindspace: ClassVar = get_rt_dir()`
  class-body call; needs `Address`-protocol rework of
  `def_bindspace` to a lazy accessor.
 - `stackscope` + `setproctitle`: already lazy/absent —
  no change needed.
--- a/ai/prompt-io/claude/20260702T161624Z_65bf9df5_prompt_io.md
+++ b/ai/prompt-io/claude/20260702T161624Z_65bf9df5_prompt_io.md
@ -1,80 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 session: f4da6654-63f9-4641-b567-f200da46d697
 timestamp: 2026-07-02T16:16:24Z
 git_ref: 65bf9df5
 scope: tests
 substantive: true
 raw_file: 20260702T161624Z_65bf9df5_prompt_io.raw.md
 ---
 ## Prompt
 > attempt to resolve
 > https://github.com/goodboy/tractor/issues/474
 > do it with /open-wkt.
 Issue #474: "We need test suite for
 `.trionics.start_or_cancel()`" — dig out the use case
 from `modden` as a unit test (and provide motivation
 for upstream `trio` to possibly provide better
 porcelain around this case). The wrapper landed via
 PR #464 with no tests.
 ## Response summary
 New `tests/trionics/test_taskc.py` (9 tests) covering
 `start_or_cancel()`, authored in wkt
 `start_or_cancel_tests_474`.
 Behaviour was first probed empirically (trio 0.29):
 the lossy `RuntimeError('child exited without calling
 task_status.started()')` only fires when the child
 exits pre-`.started()` WITHOUT propagating the ambient
 `Cancelled` — i.e. when the child (or lib code it
 calls) absorbs the cancel in a graceful-teardown
 pattern; a well-behaved child surfaces `Cancelled`
 straight out of `.start()`. The `modden`
 `progman.open_wks()` use case was reconstructed from
 `modden/runtime/progman.py` accordingly.
 Tests (each `use_start_or_cancel` parametrization also
 pins upstream trio's current lossy behaviour as
 wart-documentation):
 - `test_sibling_err_not_masked_by_startup_rte` — the
  `modden` case: sibling error OOB-cancels the shared
  nursery scope; with the wrapper ONLY the root-cause
  `ValueError` escapes; bare `.start()` adds the lossy
  RTE alongside.
 - `test_pure_oob_cancel_not_morphed_to_rte` — plain
  ancestor `cs.cancel()`: wrapper → clean exit; bare
  → eg-wrapped RTE.
 - `test_genuine_startup_rte_still_raised` — no
  cancellation → protocol-bug RTE re-raised same as
  bare.
 - `test_childs_own_rte_never_demoted_to_cancel` — a
  child's own `RuntimeError('never got started!')` /
  `RuntimeError(1234)` under ambient cancel is never
  demoted to `Cancelled` (exact-msg-match + str-guard
  regression cover).
 - `test_started_value_and_args_passthru` — happy path:
  positional args, `name=`, `.started()` value.
 Verified: 9/9 pass; 0 flakes across 50 hammer runs;
 two impl mutations (checkpoint removed; guard relaxed
 to substring match) each caught by exactly the
 targeted tests; `tests/trionics/` +
 `tests/test_trioisms.py` subset green (23 passed,
 5 xfailed); ruff clean; 69-col style.
 ## Files changed
 - `tests/trionics/test_taskc.py` — new
  `start_or_cancel()` unit-test suite (gh #474).
 ## Human edits
 Pending review — session paused pre-commit per user
 deadline; nothing committed as of this entry.
--- a/ai/prompt-io/claude/20260702T161624Z_65bf9df5_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260702T161624Z_65bf9df5_prompt_io.raw.md
@ -1,107 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 timestamp: 2026-07-02T16:16:24Z
 git_ref: 65bf9df5
 diff_cmd: git diff main..wkt/start_or_cancel_tests_474
 ---
 # Raw output — gh #474 `start_or_cancel()` test suite
 ## Generated test code
 > `git diff main..wkt/start_or_cancel_tests_474 -- tests/trionics/test_taskc.py`
 Prose summary of the generated module
 (`tests/trionics/test_taskc.py`):
 - module docstring framing the `trio.Nursery.start()`
  startup-cancellation wart, the wrapper's repair, and
  the intent that `use_start_or_cancel=False` params
  double as upstream-trio wart-documentation (break on
  a trio upgrade → upstream may have shipped porcelain,
  re-audit the wrapper); cites gh #474 / PR #464 and
  `modden`'s `progman.open_wks()` as the source use
  case.
 - shared children: `absorbs_cancel_pre_started()` (the
  graceful-teardown cancel-absorber which triggers the
  lossy RTE path) + `raise_val_err()` (fast-erroring
  sibling).
 - `test_sibling_err_not_masked_by_startup_rte`
  (parametrized `use_start_or_cancel`): asserts eg
  contains exactly one `ValueError` and, wrapper-case,
  NO residual RTE (`eg.split(ValueError)` remainder is
  `None`); bare-case, the residual RTE carries trio's
  exact "child exited without calling" wording.
 - `test_pure_oob_cancel_not_morphed_to_rte`
  (parametrized): wrapper-case runs clean and asserts
  `cs.cancelled_caught`; bare-case asserts the
  eg-wrapped RTE.
 - `test_genuine_startup_rte_still_raised`
  (parametrized): no-cancel protocol bug → RTE with
  trio's wording from both call forms.
 - `test_childs_own_rte_never_demoted_to_cancel`
  (parametrized `rte_arg` in `'never got started!'`,
  `1234`): child cancels the ambient scope then raises
  its own RTE synchronously (no checkpoint between →
  deterministically under-cancellation at catch time);
  asserts the RTE survives with `args[0]` intact.
 - `test_started_value_and_args_passthru`: `.started()`
  value, positional args and the `name=` kwarg (via
  `trio.lowlevel.current_task().name`) all forward.
 ## Non-code output (verbatim highlights)
 Behaviour probe (trio 0.29, scratchpad scripts) — the
 decision basis for the test shapes:
 ```
 == B-sibling-err use_soc=False
  start raised: RuntimeError('child exited without
    calling task_status.started()')
  top-level: ExceptionGroup([ValueError('sibling blew
    up!'), RuntimeError('child exited without calling
    task_status.started()')])
 == B-cs-cancel use_soc=False
  top-level: ExceptionGroup([RuntimeError('child
    exited without calling task_status.started()')])
 == B-sibling-err use_soc=True
  start raised: Cancelled()
  top-level: ExceptionGroup([ValueError('sibling blew
    up!')])
 == B-cs-cancel use_soc=True
  start raised: Cancelled()
  top-level: clean return
 == own-rte-under-cancel (both) -> RTE('never got
  started!') propagates unchanged
 ```
 Key finding: with a WELL-BEHAVED (non-absorbing) child
 an OOB ancestor cancel surfaces `Cancelled` directly
 from `.start()` on trio 0.29 — the lossy RTE requires
 the child to absorb its cancel pre-`.started()`, which
 is what `modden`'s `open_from_wks` teardown did. Trio's
 nursery-exit wait defers cancel delivery to children,
 so all tested shapes are deterministic (0 flakes / 50
 runs).
 Mutation verification:
 ```
 mutation 1 (checkpoint_if_cancelled removed):
  FAILED test_sibling_err_not_masked_by_startup_rte[True]
  FAILED test_pure_oob_cancel_not_morphed_to_rte[True]
 mutation 2 (guard relaxed to 'started' substring,
            isinstance dropped):
  FAILED test_childs_own_rte_never_demoted_to_cancel[never got started!]
  FAILED test_childs_own_rte_never_demoted_to_cancel[1234]
 ```
 Final runs:
 ```
 tests/trionics/test_taskc.py: 9 passed in 0.03s
 hammer: 0/50 runs failed
 tests/trionics/ + tests/test_trioisms.py:
  23 passed, 5 xfailed in 3.02s
 ```
--- a/ai/prompt-io/claude/20260702T165806Z_a34aaf98_prompt_io.md
+++ b/ai/prompt-io/claude/20260702T165806Z_a34aaf98_prompt_io.md
@ -1,78 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 session: f6c84722-471a-4458-9a80-e453fea9029f
 timestamp: 2026-07-02T16:58:06Z
 git_ref: a34aaf98
 scope: code
 substantive: true
 raw_file: 20260702T165806Z_a34aaf98_prompt_io.raw.md
 ---
 ## Prompt
 Follow-up round in the same session as the
 `tractor.to_actor` landing (see
 `20260702T154255Z_65bf9df5_prompt_io.md`). After
 committing that work the user green-lit the deferred
 items:
 > go go go on this with what time you have left, in
 > particular see if you can get the _ria_nursery
 > removal going!
 then extended the deadline twice to iterate on the
 discovered hang:
 > continue on this up until a 12:58:30 deadline
 and finally chose "Commit step A now" from the
 next-steps prompt.
 ## Response summary
 Step A of the `._ria_nursery` removal (issue #477): hoist
 `.run_in_actor()` result-reaping out of the spawn
 backends into the `ActorNursery` machinery so ria
 children spawn via the default daemon nursery,
 - new `_supervise._reap_ria_portals()` runs one
  `_spawn.cancel_on_completion()` task per ria child
  AFTER `._join_procs` is set; happy path awaits it
  right after `._join_procs.set()`.
 - error path SEQUENCES: snapshot ria
  `(portal, subactor)` pairs -> `await an.cancel()` ->
  0.5s-bounded reap. Two failed intermediates informed
  this: a concurrent reap+cancel DEADLOCKED
  `test_multierror`; a 3s bound blew
  `test_cancel_while_childs_child_in_sync_sleep`'s
  `fail_after` deadline.
 - backends (`spawn/_trio.py`, `spawn/_mp.py`) lose the
  `._cancel_after_result_on_exit` membership branch,
  per-child reaper nursery + dead imports.
 - design/probe-history doc:
  `ai/conc-anal/ria_nursery_removal_plan.md` (from an
  agent-verified machinery map).
 Verification: `test_cancellation.py` fully green
 (20 passed, 1 xfailed) incl. the previously-hung
 `test_multierror`; `test_to_actor`+`test_spawning`
 20/20; bounded full-suite gate SIGINT'd ~30s early at
 303 passed / 0 failures (user opted to commit on that
 signal, deferring the unbounded re-run to step-B
 verification).
 ## Files changed
 - `tractor/runtime/_supervise.py` — `_reap_ria_portals()`
  + two call-sites; `run_in_actor()` off the ria nursery
 - `tractor/spawn/_trio.py` — reaper branch + import drop
 - `tractor/spawn/_mp.py` — same as `_trio.py`
 - `ai/conc-anal/ria_nursery_removal_plan.md` — plan +
  probe history
 ## Human edits
 None yet — committed via the drafted
 `.claude/git_commit_msg_ria_step_a.md` (user-driven
 `git commit --edit`).
--- a/ai/prompt-io/claude/20260702T165806Z_a34aaf98_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260702T165806Z_a34aaf98_prompt_io.raw.md
@ -1,55 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 timestamp: 2026-07-02T16:58:06Z
 git_ref: a34aaf98
 diff_cmd: git diff a34aaf98..wkt/to_actor_subpkg
 ---
 # Raw AI output (diff-ref mode)
 Step-A code is committed on `wkt/to_actor_subpkg`
 directly after `a34aaf98`; per diff-ref mode the verbatim
 content is reachable via the pointers below.
 ## Generated files
 > `git diff a34aaf98..wkt/to_actor_subpkg -- tractor/runtime/_supervise.py`
 New `_reap_ria_portals(an, errors, ria_children=None)`
 helper (one `_spawn.cancel_on_completion()` task per ria
 child under `collapse_eg()` + a local nursery);
 `run_in_actor()` drops `nursery=self._ria_nursery`; happy
 path awaits the reap right after `._join_procs.set()`;
 inner error handler snapshots ria pairs, runs
 `await an.cancel()` then a `move_on_after(0.5)`-bounded
 reap over the snapshot.
 > `git diff a34aaf98..wkt/to_actor_subpkg -- tractor/spawn/_trio.py`
 > `git diff a34aaf98..wkt/to_actor_subpkg -- tractor/spawn/_mp.py`
 Both backends: the post-`_join_procs` block collapses to
 a bare `soft_kill()` (membership branch, per-child reaper
 nursery, reaper-cancel logging and the now-unused
 `cancel_on_completion` imports all removed).
 > `git diff a34aaf98..wkt/to_actor_subpkg -- ai/conc-anal/ria_nursery_removal_plan.md`
 Agent-verified machinery map, 3-step design (A/B/C),
 probe history (deadlock -> sequencing fix -> bound
 tightening) and risk register.
 ## Test runs (verbatim)
 ```
 tests/test_cancellation.py: 20 passed, 1 xfailed in 77.28s
 tests/test_to_actor.py + tests/test_spawning.py: 20 passed
 full-suite (SIGINT at 540s bound, ~30s short):
 303 passed, 9 skipped, 1 xfailed, 2 xpassed in 539.42s
 ```
 Failed intermediates (not in final diff): concurrent
 reap+`an.cancel()` deadlocked `test_multierror`; a 3s
 reap bound blew
 `test_cancel_while_childs_child_in_sync_sleep`'s
 `fail_after` deadline.
--- a/ai/prompt-io/claude/20260702T172233Z_5cd190c5_prompt_io.md
+++ b/ai/prompt-io/claude/20260702T172233Z_5cd190c5_prompt_io.md
@ -1,60 +0,0 @@
 ---
 model: claude-opus-4-8
 service: claude
 session: c7860302-6a33-4d92-821c-0807d68be464
 timestamp: 2026-07-02T17:22:33Z
 git_ref: 5cd190c5
 scope: code
 substantive: true
 raw_file: 20260702T172233Z_5cd190c5_prompt_io.raw.md
 ---
 ## Prompt
 Branched session (`to_actor_subpkg_POST_WEEKLY_CUTOFF_2OPUS`,
 now on Opus 4.8) continuing the `._ria_nursery` removal after
 step A committed + pushed (`5cd190c5`/`99310269`):
 > ok continue where your superior left off please
 then, after the commit-split discussion:
 > yup committed and pushed so take a look ma fren.
 i.e. green-lighting step-B prep against the committed step-A
 tree.
 ## Response summary
 Step B of the `._ria_nursery` removal (issue #477): delete
 the now-vestigial secondary nursery,
 - collapse the inner `async with (collapse_eg(),
  trio.open_nursery() as ria_nursery)` layer in
  `_open_and_supervise_one_cancels_all_nursery` — `da_nursery`
  becomes the single nursery for ALL subactors.
 - `ActorNursery.__init__` drops the `ria_nursery` param + the
  `self._ria_nursery` attr; `start_actor()` drops its
  `nursery=` escape-hatch param.
 - `._cancel_after_result_on_exit` kept (ria-child
  discriminator for `_reap_ria_portals()`).
 Verified behavior-preserving via a first-principles argument
 (zero-task nursery = a bare checkpoint) + the targeted gate
 (`test_cancellation test_spawning test_local test_rpc
 test_to_actor` = 49 passed, 1 xfailed on trio). The two
 error handlers were deliberately NOT merged — that changes
 propagation semantics and is deferred to its own PR (TODO
 left at the outer `except`).
 ## Files changed
 - `tractor/runtime/_supervise.py` — collapse the ria nursery
  layer + drop the ctor/`start_actor` params + refresh the
  now-stale nursery comments
 ## Human edits
 None yet — committed via the drafted
 `.claude/git_commit_msg_ria_step_b.md` (user-driven
 `git commit --edit`).
--- a/ai/prompt-io/claude/20260702T172233Z_5cd190c5_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260702T172233Z_5cd190c5_prompt_io.raw.md
@ -1,51 +0,0 @@
 ---
 model: claude-opus-4-8
 service: claude
 timestamp: 2026-07-02T17:22:33Z
 git_ref: 5cd190c5
 diff_cmd: git diff 5cd190c5..wkt/to_actor_subpkg
 ---
 # Raw AI output (diff-ref mode)
 Step-B code lives on `wkt/to_actor_subpkg` after `5cd190c5`;
 per diff-ref mode the verbatim content is reachable via the
 pointer below.
 ## Generated files
 > `git diff 5cd190c5..wkt/to_actor_subpkg -- tractor/runtime/_supervise.py`
 - `ActorNursery.__init__`: `ria_nursery` param removed;
  `self._ria_nursery = ria_nursery` block deleted;
  `_cancel_after_result_on_exit` comment refreshed.
 - `start_actor()`: `nursery=` param removed; body uses
  `self._da_nursery.start(...)` directly.
 - `_open_and_supervise_one_cancels_all_nursery()`: the inner
  `async with (collapse_eg(), trio.open_nursery() as
  ria_nursery)` layer removed; `an = ActorNursery(actor,
  da_nursery, errors)` constructed once under the single
  `da_nursery`; the inner-try body de-indented one level;
  both error handlers retained; the da-nursery lead comment
  and the outer-`except` TODO refreshed to describe the
  single-nursery reality + flag the (deferred) handler-merge.
 > `git diff 5cd190c5..wkt/to_actor_subpkg -- ai/conc-anal/ria_nursery_removal_plan.md`
 Added a "Step-B outcome" section (collapse rationale,
 handler-merge deferral, safety argument, gate result).
 ## Test runs (verbatim)
 ```
 targeted gate (trio):
 tests/test_cancellation.py tests/test_spawning.py
 tests/test_local.py tests/test_rpc.py tests/test_to_actor.py
 -> 49 passed, 1 xfailed in 88.62s
 signature checks:
 ActorNursery.__init__ params: ['self', 'actor', 'da_nursery', 'errors']
 start_actor has nursery param: False
 full-suite gate: in progress (see stepB_full.log)
 ```
--- a/ai/prompt-io/claude/20260702T222544Z_9201a2ed_prompt_io.md
+++ b/ai/prompt-io/claude/20260702T222544Z_9201a2ed_prompt_io.md
@ -1,68 +0,0 @@
 ---
 model: claude-opus-4-8
 service: claude
 session: c7860302-6a33-4d92-821c-0807d68be464
 timestamp: 2026-07-02T22:25:44Z
 git_ref: 9201a2ed
 scope: code
 substantive: true
 raw_file: 20260702T222544Z_9201a2ed_prompt_io.raw.md
 ---
 ## Prompt
 Continuing on branch `drop_ria_nursery` after step B
 (`9201a2ed`). User green-lit the deferred error-handler merge:
 > yes, i checked us out on a new branch for the ria-tn removal;
 > work off the new wkt branch drop_ria_nursery.
 and (re the migration) "nope, later we'll do this", plus:
 > do ensure the test suite is green in the current state and
 > those going forward ya?
 and the standing reminder: no commits without a human ack.
 ## Response summary
 Step B2 of the `._ria_nursery` removal (issue #477): merge the
 two nested error handlers in
 `_open_and_supervise_one_cancels_all_nursery` into one, now
 that the 2ndary nursery (whose `__aexit__` the outer handler
 originally guarded) is gone.
 Trace-driven justification (see
 `ai/conc-anal/ria_nursery_removal_plan.md` Step-B2 section):
 the old inner handler records `errors[uid]` as its FIRST
 action, so `errors` is always non-empty by the time control
 could reach the outer handler — making the outer handler's
 `raise` DEAD (always superseded by the `finally`'s
 raise-from-`errors`). Collapsing to a single
 `except BaseException as _scope_err` + the existing `finally`
 is therefore behavior-preserving.
 - removed the outer `try` + the
  `except (Exception, BaseExceptionGroup, trio.Cancelled)`
  handler; de-indented the inner handler one level.
 - dropped the now-unused `outer_err`/`inner_err` locals
  (single `_scope_err`).
 - net ~30 lines lighter.
 Gated hard: baseline (pre-B2 tip) = 300 passed + 1
 load-induced `TooSlowError` flake (passes 6/6 in isolation);
 B2 error/cancel gate (`test_cancellation remote_exc_relay
 inter_peer_cancellation advanced_faults oob_cancellation
 to_actor spawning local rpc`) = 71 passed, 1 xfailed; B2
 full-suite run following.
 ## Files changed
 - `tractor/runtime/_supervise.py` — collapse the two handlers
  into one; drop `outer_err`/`inner_err`
 ## Human edits
 None yet — committed via the drafted
 `.claude/git_commit_msg_ria_b2.md` (user-driven
 `git commit --edit`).
--- a/ai/prompt-io/claude/20260702T222544Z_9201a2ed_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260702T222544Z_9201a2ed_prompt_io.raw.md
@ -1,55 +0,0 @@
 ---
 model: claude-opus-4-8
 service: claude
 timestamp: 2026-07-02T22:25:44Z
 git_ref: 9201a2ed
 diff_cmd: git diff 9201a2ed..drop_ria_nursery
 ---
 # Raw AI output (diff-ref mode)
 Step-B2 code lives on `drop_ria_nursery` after `9201a2ed`; per
 diff-ref mode the verbatim content is reachable via the pointer
 below.
 ## Generated files
 > `git diff 9201a2ed..drop_ria_nursery -- tractor/runtime/_supervise.py`
 `_open_and_supervise_one_cancels_all_nursery`:
 - removed the outer `try:` wrapper and the
  `except (Exception, BaseExceptionGroup, trio.Cancelled) as
  _outer_err:` safety-net handler.
 - the former inner `except BaseException` is now THE handler,
  renamed local `_inner_err` -> `_scope_err`, de-indented one
  level; it sets `an._scope_error`, records `errors[uid]`,
  waits on the debugger, `_join_procs.set()`, then a shielded
  classify/log + snapshot-ria + `an.cancel()` + 0.5s-bounded
  `_reap_ria_portals()`. No re-raise (the `finally` raises
  from `errors`).
 - `finally` block unchanged.
 - dropped the `outer_err`/`inner_err` local decls at fn top.
 (The diff is large — ~119+/149- — because de-indenting the
 handler body one level rewrites every line in the block; the
 logic delta is just "two handlers -> one".)
 ## Test runs (verbatim)
 ```
 baseline (pre-B2, step-B tip 9201a2ed), full suite
 (dynamic_pub_sub deselected):
 1 failed, 300 passed, 9 skipped, 2 deselected, 1 xfailed,
 2 xpassed in 1499.49s
  -> the 1 failure = test_ext_types_over_ipc[...] trio.TooSlowError
     (load-induced; passes 6/6 in isolation in 4.89s)
 B2 error/cancel gate:
 tests/test_cancellation test_remote_exc_relay
 test_inter_peer_cancellation test_advanced_faults
 test_oob_cancellation test_to_actor test_spawning test_local
 test_rpc
 -> 71 passed, 1 xfailed in 125.26s
 B2 full-suite run: see b2_full.log
 ```
--- a/ai/prompt-io/claude/20260706T172818Z_ad42871e_prompt_io.md
+++ b/ai/prompt-io/claude/20260706T172818Z_ad42871e_prompt_io.md
@ -1,81 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 session: 6db64ac6-6986-4505-9343-df4ee31e67db
 timestamp: 2026-07-06T17:28:18Z
 git_ref: ad42871e
 scope: code
 substantive: true
 raw_file: 20260706T172818Z_ad42871e_prompt_io.raw.md
 ---
 ## Prompt
 Resuming the `drop_ria_nursery` (wkt) branch after the human's
 review pause at `ba4af0ad`, with the directive:
 > we need to resolve the remaining outstandings ... to finish
 > this endeavour we ideally,
 > - finish the ria-tn hoist into the machinery in `to_actor` if
 >   possible.
 > - avoid supporting the `.run_in_actor()` non-blocking API
 >   going forward other then if we can re-wrap `to_actor.run()`
 >   per prior discussion with opus4.8.
 > - get the test harness completely green locally and in CI -
 >   AND ESPECIALLY without any hangs due to the "the old
 >   spawn-backend reaper raced `soft_kill()`'s scope-cancel"
 > - update all docs to reflect these changes once we're happy.
 plus mid-flight additions:
 > make sure both all the test and example code uses the naming
 > `an: ActorNursery` for variable names
 > where we at in terms of a potential hackaround design for
 > supporting a to_actor.run_async() ... without requiring the
 > same malarky ... with a `trio.Event` relay ... i'm totes fine
 > with rejigging the iface to NOT return a Portal as well.
 ## Response summary
 Completed the entire #477 `run_in_actor` removal on
 `drop_ria_nursery` (16 commits this session), gated per-commit:
 - ported the remaining `test_cancellation` groups
  (`some_cancels_all`, `nested_multierrors`+`spawn_and_error`,
  SIGINT + sync-sleep) — one-shots become concurrent
  `to_actor.run()` tasks in local task-nurseries; BEG-shape
  assertions loosened for cancel-on-first + the runtime's
  `collapse_eg()` single-member unwrap (a fully-raced nested
  tree relays a bare annotated `RemoteActorError` chain).
 - fixed a pre-existing `UnboundLocalError` (`timeout` `match`
  had no default arm for non-trio/MTF backends).
 - ported `test_dynamic_pub_sub`, 4 non-debugging examples, all
  8 `debugging/` examples (debugger suite byte-identical,
  28p/6s; `multi_subactors` introduces the "collect don't
  cancel" reap-all replacement pattern), 8 docs pages + the
  `experimental/_pubsub` docstring.
 - EXCISED the API + cluster: `run_in_actor`,
  `_reap_ria_portals`, `_cancel_after_result_on_exit`,
  `Portal._submit_for_result/_expect_result_ctx/
  wait_for_result/result`, `exhaust_portal`,
  `cancel_on_completion`, `NoResult` — net -402 lines. The
  reap-hang class dissolves structurally (result-waits now only
  in caller task-scope).
 - found + fixed a real migration race: mutual-rendezvous peers
  (`test_trynamic_trio`, `a_trynamic_first_scene.py`) flaked
  because an eagerly-reaped one-shot dies while its peer still
  dials the registry-resolved (dead) sockaddr — such peers now
  pin lifetimes via `start_actor()` + concurrent `Portal.run()`
  + explicit `an.cancel()`.
 - `an: ActorNursery` naming sweep across tests/examples (±82
  lines, scoped renames, prose untouched).
 - parked a `to_actor.open_one_shot()` design sketch (acm +
  private task-nursery over blocking `run()`; done-Event as
  memo not cancel-relay; no Portal) in the plan doc.
 ## Files changed
 See commits `d01a2123..ad42871e` on `drop_ria_nursery`
 (tests, examples, docs, `tractor/{runtime,spawn,to_actor,msg}`
 + `_exceptions/_context/experimental`).
--- a/ai/prompt-io/claude/20260706T172818Z_ad42871e_prompt_io.raw.md
+++ b/ai/prompt-io/claude/20260706T172818Z_ad42871e_prompt_io.raw.md
@ -1,39 +0,0 @@
 ---
 model: claude-fable-5
 service: claude
 timestamp: 2026-07-06T17:28:18Z
 git_ref: ad42871e
 diff_cmd: git diff ba4af0ad..ad42871e
 ---
 # Raw AI output (diff-ref mode)
 This session's output spans the 16 migration/excision commits
 `d01a2123..ad42871e` on `drop_ria_nursery`; per diff-ref mode
 the verbatim content is reachable via the pointer below.
 ## Generated files
 > `git diff ba4af0ad..ad42871e`
 Commit-wise (each `Gate:`-footed msg documents its own module
 gate):
 - `d01a2123` port `test_some_cancels_all`
 - `697c6152` fix unbound `timeout` (non-trio/MTF `match` arm)
 - `fa8799d5` port `test_nested_multierrors`
 - `f11754ce` port SIGINT + sync-sleep cancel tests
 - `cb6202e3` port `test_dynamic_pub_sub`
 - `d8af5f12` port non-debugging examples
 - `a3057cb2` port debugging examples (+ `test_debugger`
  nested-nurseries final-shape expectations)
 - `d6bed7c4` port docs (8 rst pages)
 - `07e1669e` fix stale `@pub` docstring example
 - `2a59cefb` REMOVE `run_in_actor()` + the ria reap cluster
  (net -402 lines)
 - `a297a32a` fix mutual-rendezvous premature-reap race
 - `ad42871e` `an: ActorNursery` naming sweep
 Plan/design record updated in
 `ai/conc-anal/ria_nursery_removal_plan.md` (RESOLVED section +
 the `to_actor.open_one_shot()` follow-up sketch).
--- a/ai/prompt-io/claude/README.md
+++ b/ai/prompt-io/claude/README.md
@ -1,27 +0,0 @@
 # 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.
--- a/ai/prompt-io/opencode/20260804T030309Z_65bf9df5_prompt_io.md
+++ b/ai/prompt-io/opencode/20260804T030309Z_65bf9df5_prompt_io.md
@ -1,39 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: moc-teardown-completion-20260804
 timestamp: 2026-08-04T03:03:09Z
 git_ref: 65bf9df5
 scope: code
 substantive: true
 raw_file: 20260804T030309Z_65bf9df5_prompt_io.raw.md
 ---
 ## Prompt
 Patch Tractor's `maybe_open_context()` so the final consumer waits for
 resource `__aexit__()` completion and receives cleanup errors. Reuse
 `outcome.Outcome` for the exit result; use the smaller mutable
 `_CtxExit` holder if that makes the implementation simpler. Add and run
 the relevant existing unit tests, but do not commit or push the patch.
 After reviewing the result, simplify `_CtxExit` back to an optional
 exception because the success outcome carries no useful value.
 ## Response summary
 Added an exception-backed completion handshake between
 `_Cache.run_ctx()` and the final `maybe_open_context()` consumer.
 Serialized consumer registration and final teardown under the per-key
 lock, preserving that lock for queued entrants. Added deterministic
 regressions for normal exit, cleanup errors, cancellation interactions,
 service-nursery cancellation, and teardown re-entry.
 ## Files changed
 - `tractor/trionics/_mngrs.py` - publish and unwrap cached exit outcomes.
 - `tests/test_resource_cache.py` - cover completion and cancellation.
 ## Human edits
 The user directed the final simplification from `outcome.Outcome` to an
 optional exception field. The patch remains uncommitted.
--- a/ai/prompt-io/opencode/20260804T030309Z_65bf9df5_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260804T030309Z_65bf9df5_prompt_io.raw.md
@ -1,36 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-04T03:03:09Z
 git_ref: 65bf9df5
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Implemented cached-context exit completion in
 `tractor.trionics.maybe_open_context()`.
 > `git diff HEAD~1..HEAD -- tractor/trionics/_mngrs.py`
 The generated implementation adds `_CtxExit`, whose `done` event
 publishes an `outcome.Outcome[None]`. `_Cache.run_ctx()` records either
 `Value(None)` or `Error(exc)` after the resource exit attempt. The final
 MOC consumer signals `no_more_users`, waits for completion under a
 shielded cancel scope, removes the per-key lock, and unwraps the outcome
 so ordinary cleanup failures are raised at the consumer boundary.
 `trio.Cancelled`, `KeyboardInterrupt`, and `SystemExit` continue through
 the service task rather than being converted into regular cleanup
 errors.
 > `git diff HEAD~1..HEAD -- tests/test_resource_cache.py`
 The generated regressions cover successful exit blocking, cleanup-error
 delivery, final-user cancellation, cancellation combined with a cleanup
 error, and service-nursery cancellation. The existing teardown re-entry
 test now uses explicit events instead of a ten-second cleanup sleep and
 asserts that the replacement resource is a fresh cache miss.
 Verification:
 `env PYTHONPATH="$PWD" /home/goodboy/repos/tractor/py313/bin/python -m pytest tests/test_resource_cache.py`
 Result: `16 passed in 8.37s`.
--- a/ai/prompt-io/opencode/20260817T231825Z_359fe75c_prompt_io.md
+++ b/ai/prompt-io/opencode/20260817T231825Z_359fe75c_prompt_io.md
@ -1,39 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: pr475-review-fixes-20260817
 timestamp: 2026-08-17T23:18:25Z
 git_ref: 359fe75c
 scope: code
 substantive: true
 raw_file: 20260817T231825Z_359fe75c_prompt_io.raw.md
 ---
 ## Prompt
 Continue the `/code-review-changes` pass for PR #475 in its isolated
 worktree. Address the seven accepted manual-review findings in
 `tractor/ipc/_types.py` and `tractor/ipc/_uds.py`, preserve the existing
 Windows capability behavior, verify the result, and prepare the work for
 human-controlled commit and review-reply steps. Do not publish replies,
 stage, commit, or push without the required explicit authorization.
 ## Response summary
 Restored project quote, docstring, multiline-expression, and
 `match/case` conventions while retaining the Windows-safe UDS guard.
 Removed unnecessary structural and comment churn, then verified the
 focused transport, discovery, and lazy-import paths plus the missing
 `AF_UNIX` behavior.
 ## Files changed
 - `tractor/ipc/_types.py` - restore project style and guarded
  socket-family dispatch.
 - `tractor/ipc/_uds.py` - format the UDS capability gate
  consistently.
 ## Human edits
 None - the generated patch remains uncommitted and awaits human
 review.
--- a/ai/prompt-io/opencode/20260817T231825Z_359fe75c_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260817T231825Z_359fe75c_prompt_io.raw.md
@ -1,45 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-17T23:18:25Z
 git_ref: 359fe75c
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Applied the seven accepted manual-review fixes for PR #475 while
 preserving the Windows transport capability behavior.
 > `git diff HEAD~1..HEAD -- tractor/ipc/_types.py`
 The generated changes restore the project's single-quote docstring and
 string conventions, remove the unnecessary helper divider, simplify the
 transport-registry comments, and restore `match/case` socket-family
 dispatch. The UDS case retains a `HAS_UDS` guard that short-circuits
 before `socket.AF_UNIX` is evaluated on unsupported hosts. Nearby error
 messages are wrapped without changing their content.
 > `git diff HEAD~1..HEAD -- tractor/ipc/_uds.py`
 The generated change reformats the `HAS_UDS` conjunction according to
 the project's multiline boolean-expression convention and simplifies
 the adjacent capability comment.
 Verification:
 `/home/goodboy/repos/tractor/py313/bin/pytest -q tests/test_lazy_imports.py tests/discovery tests/ipc/test_server.py`
 Result: `66 passed, 2 xpassed in 60.62s`.
 `ruff check --no-cache --output-format=json tractor/ipc/_types.py tractor/ipc/_uds.py`
 Result: no findings.
 `git diff --check`
 Result: no whitespace errors.
 An explicit missing-`AF_UNIX` probe set `HAS_UDS = False`, removed the
 socket constant, and exercised an unsupported socket family. It raised
 the expected `NotImplementedError` instead of `AttributeError`.
 No review replies, commits, or pushes were published.
--- a/ai/prompt-io/opencode/20260818T031532Z_4151b956_prompt_io.md
+++ b/ai/prompt-io/opencode/20260818T031532Z_4151b956_prompt_io.md
@ -1,43 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: pr481-review-fixes-p1-20260818
 timestamp: 2026-08-18T03:15:32Z
 git_ref: 4151b956
 scope: code
 substantive: true
 raw_file: 20260818T031532Z_4151b956_prompt_io.raw.md
 ---
 ## Prompt
 Address the approved review findings on PR #481, but work
 iteratively: implement and verify one finding at a time, prepare a
 separate `/commit-plan` after each fix, and stop for the human commit
 before starting the next finding. Begin with the P1 per-child
 lifecycle issue. Also publish the already-approved review findings
 against the reviewed PR head before editing.
 ## Response summary
 Published the approved non-approving review at head `4151b956`, then
 implemented only the P1 lifecycle fix. Owned one-shot actors now use
 a child-specific cancellation and process-reap handshake, including
 hard escalation for unacknowledged cancellation and deterministic
 bookkeeping removal before `to_actor.run()` returns.
 ## Files changed
 - `tractor/runtime/_supervise.py` - coordinate child-specific cancel
  and reap.
 - `tractor/spawn/_trio.py` - wait on the Trio child's reap request.
 - `tractor/spawn/_mp.py` - wait on the multiprocessing child's reap
  request.
 - `tractor/spawn/_spawn.py` - publish monitor completion centrally.
 - `tractor/to_actor/_api.py` - await owned-child process reaping.
 - `tests/test_to_actor.py` - cover cleanup, escalation, and startup
  ordering.
 ## Human edits
 None - the generated P1 patch remains uncommitted for human review.
--- a/ai/prompt-io/opencode/20260818T031532Z_4151b956_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260818T031532Z_4151b956_prompt_io.raw.md
@ -1,74 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-18T03:15:32Z
 git_ref: 4151b956
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Implemented only the P1 lifecycle finding from the approved PR #481
 review, preserving the requested one-fix-at-a-time commit boundary.
 > `git diff HEAD~1..HEAD -- tractor/runtime/_supervise.py`
 Added per-child reap request/completion events to `ActorNursery`, a
 shielded child-specific cancel-and-reap operation, late-registration
 latching for nursery teardown, and cancellation escalation that waits
 for debugger release before using non-ignorable process termination.
 The nursery-wide cancellation path snapshots child records before
 checkpointing so concurrent one-shot cleanup cannot invalidate its
 iteration.
 > `git diff HEAD~1..HEAD -- tractor/spawn/_trio.py`
 Changed Trio child monitors to wait on their per-child reap requests.
 > `git diff HEAD~1..HEAD -- tractor/spawn/_mp.py`
 Changed multiprocessing child monitors to wait on their per-child reap
 requests.
 > `git diff HEAD~1..HEAD -- tractor/spawn/_spawn.py`
 Ensured every backend publishes child-reap completion after its process
 monitor exits.
 > `git diff HEAD~1..HEAD -- tractor/to_actor/_api.py`
 Changed owned one-shot cleanup to await child-specific process joining
 and bookkeeping removal instead of treating the cancel RPC as reaping.
 > `git diff HEAD~1..HEAD -- tests/test_to_actor.py`
 Added regressions for immediate caller-managed nursery cleanup, failed
 cancel acknowledgement escalation, and child registration after a
 latched nursery-wide teardown request.
 Verification:
 `pytest -q tests/test_to_actor.py tests/test_cancellation.py tests/test_spawning.py tests/discovery/test_multi_program.py`
 Result: `46 passed, 1 xfailed, 3 xpassed`.
 `pytest -q tests/test_to_actor.py --tpt-proto uds`
 Result: `13 passed`.
 `pytest -q tests/test_to_actor.py --spawn-backend mp_spawn --tpt-proto tcp`
 Result: `13 passed`.
 One broad verification run was mistakenly launched in parallel with
 the UDS and `mp_spawn` actor suites. It timed out
 `test_remote_error_from_caller_nursery`; the node passed immediately
 in isolation and the complete broad selection then passed serially.
 The failure was classified as concurrent test-session interference,
 not accepted as a passing boundary result.
 Ruff, Python compilation, and `git diff --check` passed for the changed
 boundary. Ruff's existing `_trio.py` F401 finding was reproduced at the
 unmodified PR head and excluded from attribution to this patch.
 No source files were staged, committed, pushed, or used for review
 replies. The previously approved top-level review was published before
 the fix at reviewed head `4151b956`.
--- a/ai/prompt-io/opencode/20260818T193001Z_bf06b4f8_prompt_io.md
+++ b/ai/prompt-io/opencode/20260818T193001Z_bf06b4f8_prompt_io.md
@ -1,36 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: ses_3e4c90d3eafeqHEtRYSIHgHhpA
 timestamp: 2026-08-18T19:30:01Z
 git_ref: bf06b4f8
 scope: code
 substantive: true
 raw_file: 20260818T193001Z_bf06b4f8_prompt_io.raw.md
 ---
 ## Prompt
 Fix cancellation during an indeterminate transport write without
 allowing a second RPC msg to corrupt the stream. Keep the transport
 fix separate from the higher-level `to_actor` remediation and explain
 the length-prefixed protocol rather than using unexplained "framed
 send" terminology.
 ## Response summary
 Close a msgpack transport stream when cancellation interrupts its
 length-prefixed `send_all()` operation. The stream can no longer be
 safely reused because Trio cannot report how many bytes were written.
 ## Files changed
 - `tractor/ipc/_transport.py` - close an interrupted send stream.
 - `tests/ipc/test_each_tpt.py` - cover cancellation during the write.
 ## Human edits
 The human required this transport edge-case fix to land as its own
 behavioral commit with a detailed message. During staged review, the
 human also rejected the unexplained "framed send" wording and asked
 for terminology tied directly to the actual transport operation.
--- a/ai/prompt-io/opencode/20260818T193001Z_bf06b4f8_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260818T193001Z_bf06b4f8_prompt_io.raw.md
@ -1,19 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-18T19:30:01Z
 git_ref: bf06b4f8
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Prospective review found that cancellation can interrupt
 `MsgpackTransport.send()` after `send_all()` writes only part of its
 length-prefixed msg. Sending a cancellation request afterward can
 append another msg to the indeterminate stream and desynchronize the
 peer decoder.
 > `git diff HEAD~1..HEAD -- tractor/ipc/_transport.py tests/ipc/test_each_tpt.py`
 Close the stream under a cancellation shield when `send_all()` is
 cancelled. Cover the behavior with a fake stream that checkpoints
 inside the write and records forced closure.
--- a/ai/prompt-io/opencode/20260818T193002Z_bf06b4f8_prompt_io.md
+++ b/ai/prompt-io/opencode/20260818T193002Z_bf06b4f8_prompt_io.md
@ -1,37 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: ses_3e4c90d3eafeqHEtRYSIHgHhpA
 timestamp: 2026-08-18T19:30:02Z
 git_ref: bf06b4f8
 scope: code
 substantive: true
 raw_file: 20260818T193002Z_bf06b4f8_prompt_io.raw.md
 ---
 ## Prompt
 Distill repeated `Actor._contexts.pop()` machinery into a wrapper like
 the RPC-task registration helper so future teardown sites do not keep
 reconstructing the context-registry key independently. Preserve the
 existing lifecycle-specific cleanup behavior.
 ## Response summary
 Add idempotent `Actor._drop_context()` registry removal keyed from the
 context's own channel and CID. Use it for caller context teardown and
 the strict callee-side RPC deregistration path.
 ## Files changed
 - `tractor/runtime/_runtime.py` - own context-registry removal.
 - `tractor/runtime/_rpc.py` - use the helper for callee teardown.
 - `tractor/_context.py` - use the helper after caller teardown.
 ## Human edits
 The human identified the repeated registry-pop code and requested a
 central primitive analogous to `_register_rpc_task()`. The agent first
 suggested an async helper that also closed receive channels; the final
 design was narrowed to registry removal only so each lifecycle owner
 retains its existing closure, debugger, shielding, and error policy.
--- a/ai/prompt-io/opencode/20260818T193002Z_bf06b4f8_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260818T193002Z_bf06b4f8_prompt_io.raw.md
@ -1,18 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-18T19:30:02Z
 git_ref: bf06b4f8
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Repeated teardown sites reconstruct the `Actor._contexts` registry
 key from a portal channel and context ID before popping it. Add an
 idempotent actor-owned helper deriving the key from the context itself,
 then route caller and callee context teardown through that helper.
 > `git diff HEAD~1..HEAD -- tractor/runtime/_runtime.py tractor/runtime/_rpc.py tractor/_context.py`
 Keep receive-channel closure and cancellation shielding in each
 lifecycle owner so the helper centralizes registry machinery without
 changing their teardown ordering.
--- a/ai/prompt-io/opencode/20260818T193003Z_bf06b4f8_prompt_io.md
+++ b/ai/prompt-io/opencode/20260818T193003Z_bf06b4f8_prompt_io.md
@ -1,38 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: ses_3e4c90d3eafeqHEtRYSIHgHhpA
 timestamp: 2026-08-18T19:30:03Z
 git_ref: bf06b4f8
 scope: code
 substantive: true
 raw_file: 20260818T193003Z_bf06b4f8_prompt_io.raw.md
 ---
 ## Prompt
 Cancel a remote task when its caller is cancelled after `Start`
 publication but before startup acknowledgement. Keep cancellation
 bounded, prevent its private `_cancel_task` RPC from recursively
 cancelling itself and preserve public target kwargs unchanged.
 ## Response summary
 Add private portal startup policy, use it for non-recursive context
 cancellation and clean caller-side startup state under a shield.
 ## Files changed
 - `tractor/runtime/_portal.py` - separate private startup policy.
 - `tractor/_context.py` - disable recursion for cancellation RPCs.
 - `tractor/runtime/_runtime.py` - clean cancelled task startup.
 - `tests/test_context_stream_semantics.py` - control cancellation
  between `Start` publication and acknowledgement.
 ## Human edits
 The human required this cancellation behavior to remain a distinct
 commit from general startup failures and from the public `to_actor`
 API. The human also requested that its runtime comment describe the
 actual length-prefixed transport guarantee and concrete `_cancel_task`
 operation rather than referring to an unnamed wrapper.
--- a/ai/prompt-io/opencode/20260818T193003Z_bf06b4f8_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260818T193003Z_bf06b4f8_prompt_io.raw.md
@ -1,20 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-18T19:30:03Z
 git_ref: bf06b4f8
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Cancellation while `Actor.start_remote_task()` waits for `StartAck`
 can strand its caller-side context and leave the remote task running.
 Make one bounded cleanup request, remove local startup state and close
 its receive channel.
 > `git diff HEAD~1..HEAD -- tractor/runtime/_runtime.py tractor/runtime/_portal.py tractor/_context.py tests/test_context_stream_semantics.py`
 Separate private startup-cancellation policy from public target kwargs
 using `Portal._run_from_ns()`. Have `Context.cancel()` disable recursive
 startup cancellation for its own `_cancel_task` RPC. Exercise
 cancellation after `Start` publication and prove the caller-owned actor
 remains reusable without leaked contexts.
--- a/ai/prompt-io/opencode/20260818T193004Z_bf06b4f8_prompt_io.md
+++ b/ai/prompt-io/opencode/20260818T193004Z_bf06b4f8_prompt_io.md
@ -1,36 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: ses_3e4c90d3eafeqHEtRYSIHgHhpA
 timestamp: 2026-08-18T19:30:04Z
 git_ref: bf06b4f8
 scope: code
 substantive: true
 raw_file: 20260818T193004Z_bf06b4f8_prompt_io.raw.md
 ---
 ## Prompt
 Release caller-side context state for every remote-task startup failure,
 not only local cancellation. Preserve the remote error, avoid unsafe
 follow-up sends and prove pre-publication serialization failures leave
 a reused portal healthy.
 ## Response summary
 Extend remote-task startup cleanup across send, acknowledgement and
 validation errors. Track completed publication, perform only safe
 best-effort cancellation and deterministically remove local state.
 ## Files changed
 - `tractor/runtime/_runtime.py` - clean every startup failure path.
 - `tests/test_context_stream_semantics.py` - cover authorization and
  serialization failures before context entry.
 ## Human edits
 The human accepted the discovered edge-case fixes but required general
 startup cleanup to land separately from cancellation cleanup, transport
 integrity and the public API. This boundary preserves that behavioral
 distinction and its dedicated commit-message rationale.
--- a/ai/prompt-io/opencode/20260818T193004Z_bf06b4f8_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260818T193004Z_bf06b4f8_prompt_io.raw.md
@ -1,19 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-18T19:30:04Z
 git_ref: bf06b4f8
 diff_cmd: git diff HEAD~1..HEAD
 ---
 `Actor.start_remote_task()` inserts a context before sending `Start`,
 but startup errors other than cancellation escape without removing or
 closing that caller state. Serialization errors, acknowledgement
 timeouts, malformed acknowledgements and remote authorization errors
 can therefore leak context-registry entries.
 > `git diff HEAD~1..HEAD -- tractor/runtime/_runtime.py tests/test_context_stream_semantics.py`
 Cover the complete send, acknowledgement and validation phase with
 exceptional cleanup. Attempt remote cancellation only when publication
 is known complete or protocol-safe, and always release local state.
--- a/ai/prompt-io/opencode/20260818T193005Z_bf06b4f8_prompt_io.md
+++ b/ai/prompt-io/opencode/20260818T193005Z_bf06b4f8_prompt_io.md
@ -1,52 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: ses_3e4c90d3eafeqHEtRYSIHgHhpA
 timestamp: 2026-08-18T19:30:05Z
 git_ref: bf06b4f8
 scope: code
 substantive: true
 raw_file: 20260818T193005Z_bf06b4f8_prompt_io.raw.md
 ---
 ## Prompt
 Replace abandoned `Portal.run()` one-shots with a static linked-context
 endpoint. Follow Trio positional-call semantics, use partials for target
 keywords, preserve Python 3.14 Placeholder behavior, keep target lookup
 behind the RPC allowlist and support private, nursery and portal
 placement.
 ## Response summary
 Use `Portal.open_context()` and `Context.wait_for_result()` for one-shot
 tasks. Normalize every partial layer, validate signatures locally and
 send target namespace/function components separately to the authorized
 remote resolver. Retain the client-side function in its `NamespacePath`
 so `to_tuple()` does not re-import it. Owned actors enable the declaring
 `_api.__name__` directly; caller-owned portals opt in through the public
 `to_actor.MODULE` alias.
 ## Files changed
 - `tractor/to_actor/_api.py` - implement linked one-shot calls.
 - `tractor/to_actor/__init__.py` - export `MODULE`.
 - `tractor/msg/ptr.py` - retain refs created by `from_ref()`.
 - `tests/test_to_actor.py` - cover the public API and authorization.
 - `examples/parallelism/to_actor_one_shots.py` - use positional inputs.
 ## Human edits
 The human rejected nested target-kwargs configuration and selected
 Trio-style positional inputs plus `functools.partial()`. During staged
 review the human required a Python 3.14 compatibility comment rather
 than removing Placeholder support, requested separate namespace and
 function inputs, preserved `_get_rpc_func(ns: str, funcname: str)`
 authorization, renamed `RPC_MODULE` to `MODULE`, rejected global module
 exposure and deferred speculative nursery/module-list helpers to the
 `open_taskman()` design line. The human also required this public API
 to land only after its lower-level safety dependencies. In final staged
 review, the human required `_invoke_from_portal()` to use
 `NamespacePath.to_tuple()` with the already-held function ref and
 required internal actor setup to use `_api.__name__` directly, keeping
 `to_actor.MODULE` solely as the public importer-facing alias.
--- a/ai/prompt-io/opencode/20260818T193005Z_bf06b4f8_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260818T193005Z_bf06b4f8_prompt_io.raw.md
@ -1,24 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-18T19:30:05Z
 git_ref: bf06b4f8
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Implement `to_actor.run()` with Trio-style positional target arguments,
 `functools.partial` keyword and Python 3.14 Placeholder binding, and a
 static context endpoint that links remote results, errors and caller
 cancellation.
 > `git diff HEAD~1..HEAD -- tractor/to_actor/_api.py tractor/to_actor/__init__.py`
 Resolve target functions through `Actor._get_rpc_func()` so module
 authorization remains authoritative. Automatically expose the helper
 module for actors owned by `to_actor.run()` and document explicit
 exposure for a caller-owned portal.
 > `git diff HEAD~1..HEAD -- tests/test_to_actor.py examples/parallelism/to_actor_one_shots.py`
 Cover placement modes, argument binding, nested partials, caller-linked
 cancellation, remote errors and module authorization.
--- a/ai/prompt-io/opencode/20260819T020757Z_b38efed7_prompt_io.md
+++ b/ai/prompt-io/opencode/20260819T020757Z_b38efed7_prompt_io.md
@ -1,34 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: ses_3e4c90d3eafeqHEtRYSIHgHhpA
 timestamp: 2026-08-19T02:07:57Z
 git_ref: b38efed7
 scope: code
 substantive: true
 raw_file: 20260819T020757Z_b38efed7_prompt_io.raw.md
 ---
 ## Prompt
 Resolve the remaining P3 review finding before landing PR #481:
 `runtime_kwargs={}` must not be silently accepted alongside either
 `an=` or `portal=` merely because the dict is falsey. Keep this as its
 own final review-remediation commit.
 ## Response summary
 Treat any non-`None` `runtime_kwargs` value as provided when validating
 placement. Cover both placement APIs with empty and configured dicts,
 proving the error is raised locally before actor startup.
 ## Files changed
 - `tractor/to_actor/_api.py` - validate option presence explicitly.
 - `tests/test_to_actor.py` - cover four invalid option combinations.
 ## Human edits
 No direct line edits. The human accepted the P3 finding, required it to
 remain separate from the five P2 behavioral commits and prioritized it
 before the final PR #484 integration rebase and PR #481 landing steps.
--- a/ai/prompt-io/opencode/20260819T020757Z_b38efed7_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260819T020757Z_b38efed7_prompt_io.raw.md
@ -1,25 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-19T02:07:57Z
 git_ref: b38efed7
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Fix the final PR #481 review finding: `runtime_kwargs` is mutually
 exclusive with both caller placement options whenever it is provided,
 including an empty dict.
 > `git diff HEAD~1..HEAD -- tractor/to_actor/_api.py tests/test_to_actor.py`
 Use an explicit `is not None` check rather than dict truthiness. Expand
 the validation regression across `an=` and `portal=`, each with empty
 and configured runtime kwargs, so every invalid combination fails
 before actor runtime startup.
 Verification:
 - Trio/TCP: `23 passed`
 - Trio/UDS: `23 passed`
 - `mp_spawn`/TCP: `23 passed`
 - Ruff and `git diff --check`: clean
--- a/ai/prompt-io/opencode/20260819T184640Z_481ba003_prompt_io.md
+++ b/ai/prompt-io/opencode/20260819T184640Z_481ba003_prompt_io.md
@ -1,56 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 session: 76c5d31c-5a2f-4503-9b16-410ee7f4fab3
 timestamp: 2026-08-19T18:46:40Z
 git_ref: 481ba003
 scope: code
 substantive: true
 raw_file: 20260819T184640Z_481ba003_prompt_io.raw.md
 ---
 ## Prompt
 Rebase PR #484 onto final PR #481, migrate every affected one-shot call
 to the new positional target API and continue through downstream tests,
 examples and documentation review.
 ## Response summary
 Converted stale target keyword calls to target partials so previously
 named inputs remain explicit while placement/runtime controls stay
 direct. Updated error expectations for local signature validation and
 linked remote error propagation, then corrected docs which still
 described the removed one-shot implementation. Linked spawning and
 context lifecycle prose to the corresponding API methods and detailed
 context guide.
 ## Files changed
 - `docs/api/core.rst` - describe linked one-shot context execution.
 - `docs/guide/rpc.rst` - update placement and target call semantics.
 - `docs/guide/spawning.rst` - document positional target inputs.
 - `examples/debugging/multi_nested_subactors_error_up_through_nurseries.py` - migrate nested actor target inputs.
 - `examples/debugging/root_cancelled_but_child_is_in_tty_lock.py` - preserve named recursive target inputs with partials.
 - `tests/test_advanced_streaming.py` - migrate streaming target inputs.
 - `tests/test_cancellation.py` - migrate calls and tighten errors.
 - `tests/test_infected_asyncio.py` - bind asyncio target options.
 - `tests/test_rpc.py` - migrate RPC target argument binding.
 - `tests/test_runtime.py` - preserve named runtime target inputs.
 - `tests/test_spawning.py` - preserve named spawning target inputs.
 ## Human edits
 The human selected the stack order and final PR #481 base, asked the
 agent to continue after each diagnostic step and required a complete
 commit plan after independently force-pushing the rebased history.
 After reviewing the migration, the human required every formerly named
 target input to remain visibly named through `functools.partial()`
 rather than becoming positional. These were human-directed agent edits;
 the human also required plain `start_actor()` and `open_context()`
 references in the spawning and RPC guides to link to their API methods
 and the detailed context guide, then clarified that `to_actor.run()`
 already uses the full context API while `Portal.run()` should share
 linked lifecycle machinery without necessarily delegating through
 `Portal.open_context()` or adding a `Started` message. The human made
 no direct source-line edits.
--- a/ai/prompt-io/opencode/20260819T184640Z_481ba003_prompt_io.raw.md
+++ b/ai/prompt-io/opencode/20260819T184640Z_481ba003_prompt_io.raw.md
@ -1,30 +0,0 @@
 ---
 model: openai/gpt-5.6-sol
 service: opencode
 timestamp: 2026-08-19T18:46:40Z
 git_ref: 481ba003
 diff_cmd: git diff HEAD~1..HEAD
 ---
 Migrate PR #484's downstream one-shot calls to PR #481's final
 `tractor.to_actor.run()` contract after the stack rebase.
 > `git diff HEAD~1..HEAD -- docs examples tests`
 Pass target arguments positionally and bind target keyword-only inputs
 with `functools.partial()`. Keep placement and runtime controls as
 direct `to_actor.run()` keywords. Update the invalid-target-argument
 test to expect local signature binding before actor startup and require
 direct `RemoteActorError` propagation from linked one-shots.
 Update API and guide prose to describe positional target inputs,
 linked `Portal.open_context()` execution and per-child reaping instead
 of the removed `Portal.run()` and target-`**kwargs` conventions.
 Verification:
 - core and migrated runtime batches: `97 passed`
 - discovery and related lifecycle batch: `33 passed, 1 skipped`
 - changed executable examples: `9 passed`
 - mapped debugger cases: `12 passed, 6 skipped`
 - Ruff, compilation and `git diff --check`: clean
--- a/ai/prompt-io/opencode/README.md
+++ b/ai/prompt-io/opencode/README.md
@ -1,22 +0,0 @@
 # AI Prompt I/O Log - OpenCode
 This directory tracks prompt inputs and model outputs for AI-assisted
 development using `opencode`.
 ## 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 workflow. Human contributors remain
 accountable for all decisions. AI-generated content is never presented as
 human-authored work.
--- a/ai/prompt-io/prompts/issue_477.md
+++ b/ai/prompt-io/prompts/issue_477.md
@ -1,7 +0,0 @@
 NOTE: you MUST pause this work at 12:50PM EST (BEFORE your weekly
 limit reset) for review by a human!
 ---
 attempt to resolve https://github.com/goodboy/tractor/issues/477
 do it with /open-wkt.
--- a/ai/prompt-io/prompts/multiaddr_declare_eps.md
+++ b/ai/prompt-io/prompts/multiaddr_declare_eps.md
@ -1,76 +0,0 @@
 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!
--- a/ai/prompt-io/prompts/subints_spawner.md
+++ b/ai/prompt-io/prompts/subints_spawner.md
@ -1,34 +0,0 @@
 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.
--- a/ai/tooling-todos/logspec_leaf_module_granularity_route_b.md
+++ b/ai/tooling-todos/logspec_leaf_module_granularity_route_b.md
@ -1,159 +0,0 @@
 # 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`).
--- a/docs/README.rst
+++ b/docs/README.rst
@ -1,4 +1,4 @@
-|logo| ``tractor``: distributed structured concurrency
+|logo| ``tractor``: distributed structurred concurrency
 ``tractor`` is a `structured concurrency`_ (SC), multi-processing_ runtime built on trio_.
@ -23,11 +23,16 @@ model" looks like, and that's **intentional**.
 Where do i start!?
 ------------------
-New to ``trio`` and **structured concurrency**? Our docs collect the
+The first step to grok ``tractor`` is to get an intermediate
-best starting points and then walk you straight into a hands-on
+knowledge of ``trio`` and **structured concurrency** B)
-quickstart:
+
 Some great places to start are,
 - the seminal `blog post`_
 - obviously the `trio docs`_
 - wikipedia's nascent SC_ page
 - the fancy diagrams @ libdill-docs_
  https://goodboy.github.io/tractor/start/quickstart.html
 Features
 --------
@ -52,7 +57,6 @@ 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,
@ -94,7 +98,7 @@ 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
@ -106,53 +110,545 @@ 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
 -------------
-We prefer to point you at the runnable scripts under ``examples/``
+In ``tractor``'s (very lacking) documention we prefer to point to
- each is CI-run and ``literalinclude``-d straight into the docs, so
+example scripts in the repo over duplicating them in docs, but with
-what you read there is what actually runs - rather than inline a
+that in mind here are some definitive snippets to try and hook you
-pile of them here. The one-minute pitch: spawn a subactor per core,
+into digging deeper.
 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/
+Run a func in a process
- examples: https://github.com/goodboy/tractor/tree/main/examples
+***********************
 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
 Under the hood
 --------------
-``tractor`` is an attempt to pair trionic_ `structured
+``tractor`` is an attempt to pair trionic_ `structured concurrency`_ with
-concurrency`_ with distributed Python - think of it as ``trio``
+distributed Python. You can think of it as a ``trio``
-*-across-processes*, or as an opinionated replacement for the
+*-across-processes* or simply as an opinionated replacement for the
-stdlib's ``multiprocessing`` built on async primitives from the
+stdlib's ``multiprocessing`` but built on async programming primitives
-ground up. But really it **is just** ``trio``: nurseries that
+from the ground up.
 spawn *processes* and cancel-able streaming IPC between them. If
 you can drive ``trio``, you can drive ``tractor``.
-"But wait - don't 'actors' have mailboxes and messages and
+Don't be scared off by this description. ``tractor`` **is just** ``trio``
-stuff?!" Well, we've got (well referenced) opinions on what an "actor
+but with nurseries for process management and cancel-able streaming IPC.
-model" **actually is** (tl;dr: the `3 axioms`_, not the cultural
+If you understand how to work with ``trio``, ``tractor`` will give you
-baggage) - that whole riff lives in our docs:
+the parallelism you may have been needing.
  https://goodboy.github.io/tractor/explain/sc-distributed.html#hold-up-is-this-an-actor-model
-What's on the TODO
+Wait, huh?! I thought "actors" have messages, and mailboxes and stuff?!
------------------
+***********************************************************************
-The roadmap lives with our docs - see `what the future holds
+Let's stop and ask how many canon actor model papers have you actually read ;)
-<https://goodboy.github.io/tractor/project/index.html#what-the-future-holds>`_
+
-for where ``tractor`` is headed.
+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..
 Feel like saying hi?
 --------------------
@ -163,24 +659,36 @@ 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
@ -191,10 +699,10 @@ 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://github.com/goodboy/tractor/actions/workflows/docs.yml/badge.svg?branch=main
+.. |docs| image:: https://readthedocs.org/projects/tractor/badge/?version=latest
-    :target: https://goodboy.github.io/tractor/
+    :target: https://tractor.readthedocs.io/en/latest/?badge=latest
-    :alt: Documentation
+    :alt: Documentation Status
-.. |logo| image:: _static/tractor_logo_wire.svg
+.. |logo| image:: _static/tractor_logo_side.svg
    :width: 250
    :align: middle
--- a/docs/_diagrams/actor_tree.svg
+++ b/docs/_diagrams/actor_tree.svg
--- a/docs/_diagrams/context_handshake.svg
+++ b/docs/_diagrams/context_handshake.svg
--- a/docs/_diagrams/debug_lock.svg
+++ b/docs/_diagrams/debug_lock.svg
--- a/docs/_diagrams/error_propagation.svg
+++ b/docs/_diagrams/error_propagation.svg
--- a/docs/_diagrams/infected_aio.svg
+++ b/docs/_diagrams/infected_aio.svg
--- a/docs/_diagrams/runtime_stack.svg
+++ b/docs/_diagrams/runtime_stack.svg
--- a/docs/_diagrams/streaming_pipeline.svg
+++ b/docs/_diagrams/streaming_pipeline.svg
--- a/docs/_ext/d2diagrams.py
+++ b/docs/_ext/d2diagrams.py
@ -1,387 +0,0 @@
 # 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,
    }
--- a/docs/_ext/marginalia.py
+++ b/docs/_ext/marginalia.py
@ -1,51 +0,0 @@
 # 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,
    }
--- a/docs/_static/css/custom.css
+++ b/docs/_static/css/custom.css
@ -1,185 +0,0 @@
 /* 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;
 }
--- a/docs/_static/tractor_hero.html
+++ b/docs/_static/tractor_hero.html
@ -1,462 +0,0 @@
 <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
 		c0.2-7.3-1.7-13-6.5-19c-18.6-23.3-36.2-47.3-56.9-69c-18-18.8-36.7-36.8-56.4-53.8c-31.8-27.5-65.4-52.7-101-74.9
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 		c-46.8,32.8-90.1,69.8-129.5,111.1c-18.1,19-35.1,39.2-50.5,60.6c-3.9,5.5-5.5,11-5.3,17.6c0.4,9.3,0,18.7,0,28
 		c0,9.3-3.1,16.4-11.8,21.4c-10.4,5.9-19.9,13.4-30.1,19.8l-25.4,17.2c-11.6,7.8-23.3,15.5-34.9,23.3c-34.3,23-68.6,46-102.9,69
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 		c0-5.7,0.4-11.3,0.5-17c0.1-3.7,1.2-7.3,3-10.5c3.4-5.9,9.3-7.7,15.4-4.8c2.7,1.3,5.1,3.1,7.6,4.8c44.3,29.6,88.5,59.3,132.8,88.9
 		l29.7,20.1c10.8,6.6,20.9,14.3,31.7,20.9c6.7,4.1,9.7,9.8,9.8,17.3c0.2,11,0.4,22,0.2,33c-0.1,5.2,1.2,9.6,4.2,13.9
 		c15.4,22.2,33,42.8,51.6,62.2c53.9,56.4,114.1,105.1,181.4,144.6c38.4,22.6,78.3,42.4,119.9,58.6c40,15.6,80.9,28.3,122.8,38
 		c52.7,12.1,106,19.3,160,22.6c18.3,1.1,36.6,2.1,54.9,1.5c17.7-0.6,35.5,1.1,53.2-0.1c17.6-1.1,35.2-2.3,52.8-3.6
 		c35.9-2.5,71.4-8.5,106.7-15.1c53.4-9.9,105.5-25,156-45.1c53.8-21.5,105.1-48.2,153.2-80.9c43.4-29.5,83.6-62.7,121.1-99.3
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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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--- a/docs/api/context.rst
+++ b/docs/api/context.rst
@ -1,134 +0,0 @@
 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
--- a/docs/api/core.rst
+++ b/docs/api/core.rst
@ -1,166 +0,0 @@
 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,
             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.
 One-shot task actors
 --------------------
 .. autofunction:: tractor.to_actor.run
 .. note::
   :func:`tractor.to_actor.run` (parlance of
   ``trio.to_thread.run_sync()`` and friends) is the
   *convenience* one-shot — spawn, run a single task, block on
   its result, reap — built entirely on
   :meth:`ActorNursery.start_actor`, a linked
   :meth:`Portal.open_context` call and per-child cancellation/reaping,
   so don't design around it as the core model. It supersedes the
   removed (legacy, non-blocking) ``ActorNursery.run_in_actor()``.
 .. 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,
             cancel_actor,
             chan
 .. deprecated:: 0.1.0a6
   The str-form ``Portal.run('mod.path', 'fn_name')`` 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
--- a/docs/api/devx.rst
+++ b/docs/api/devx.rst
@ -1,92 +0,0 @@
 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
--- a/docs/api/discovery.rst
+++ b/docs/api/discovery.rst
@ -1,67 +0,0 @@
 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.
--- a/Show More
+++ b/Show More