Follow-up to @msh01's wall-deadline init-timeout fix.
- Resource leak: on timeout the initialize() task is abandoned without
awaiting its (shielded, possibly-never-completing) cancellation, so the
half-built PTB app's httpx client / connection pool was never closed —
up to 8x across the retry ladder. Add an optional on_abandon cleanup to
_await_with_thread_deadline that best-effort app.shutdown()s the abandoned
app, run detached + exception-swallowed so it can never re-block or re-hang
the ladder (mirrors _close_client_on_timeout in agent/auxiliary_client.py).
- Cover the helper itself: the salvaged test monkeypatched out the real
_await_with_thread_deadline, so its abandonment/cleanup path was untested.
Add direct tests for happy-path return, prompt-timeout-with-cleanup, and
cleanup-error-swallowed; the wedged coroutines swallow cancellation for a
bounded window (proving the helper returns before cancellation completes,
the #58236 shielded-scope behavior) without leaving an immortal task that
would wedge pytest teardown. Widen the salvaged stub to accept on_abandon.
- Attribution: add yingwaizhiying@gmail.com -> msh01 to AUTHOR_MAP (bare
gmail does not auto-resolve the check-attribution gate).
Known follow-up (not addressed here): the retry ladder reuses the same
self._app across all 8 attempts; a fresh app per attempt would fully close
the coherence risk if an abandoned initialize() completes in the background.
That is a larger restructure of the ~130-line builder+handler setup, left
for a separate change.
