Which cleans out the pkg-mod to just the expected exports with (its
longstanding todo comment list) and thus a separation-of-concerns
and smaller mod-file sizes via the following new sub-mods:
- `._trace` for the `.pause()`/`breakpoint()`/`pdb.set_trace()`-style
APIs including all sync-caller variants.
- `._post_mortem` to contain our async `.post_mortem()` and all other
public crash handling APIs for use from sync callers.
- `._sync` for the high-level syncing helper-routines used throughout the
runtime to avoid multi-proc TTY use collisions.
And also,
- remove `hide_runtime_frames()` since moved to `.devx._frame_stack`.
From what was originall the `.devx._debug` monolith module, since that
file was way out of ctl in terms of LoC!
New modules so far include,
- ._repl: our `pdb[p]` ext type/lowlevel-APIs and `mk_pdb()` factory.
- ._sigint: just our REPL-interaction shield-handler.
- ._tty_lock: containing all the root-actor TTY mutex machinery
including the `Lock`/`DebugStatus` primitives/APIs as well as the
inter-tree IPC context eps:
* the server-side `lock_stdio_for_peer()` which pairs with the,
* client-(subactor)-side `request_root_stdio_lock()` via the,
* pld-msg-spec of `LockStatus/LockRelease`.
AND the `any_connected_locker_child()` predicate.
Factoring the (basically duplicate) content from both use spots into
a common `@cm` which delivers a `bool` signalling whether the REPL
should be engaged. Fixes a lingering bug with `nullcontext()` calling
btw..
Tyler Goodlet