fix(telegram): wall-deadline init timeout + shut down abandoned init app

[kshitijk4poor]

Summary

Salvage of #58250 (@msh01) onto current main, plus a follow-up that closes a resource leak the abandonment path introduced and covers the new helper directly.

Fixes #58236: under s6 supervision, asyncio.wait_for(self._app.initialize(), timeout=30) never fires because httpcore's initialize() sits inside anyio shielded CancelScopes, so the timeout's cancellation never propagates — the bot hangs on "attempt 1/8" forever. (The reporter confirmed a naive Timer + task.cancel() still hangs, because it awaits cancellation.)

Changes

• @msh01's commit (preserved): replace wait_for with _await_with_thread_deadline() — a daemon threading.Timer wakes the loop and, on timeout, abandons the wedged task (cancels without awaiting cancellation) and raises TimeoutError so the 8-attempt retry ladder advances instead of hanging.
• Follow-up (this salvage):
  • Resource leak: the abandoned initialize() leaves the half-built PTB app's httpx client / connection pool open (never awaited to completion), leaking a pool per retry attempt (up to 8×). Add an optional on_abandon cleanup to the helper, 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).
  • Leak-fix must actually release the pool: Application.shutdown()/Bot.shutdown() are gated on _initialized/_requests_initialized, which a wedged initialize() may never set — so calling only app.shutdown() no-ops and leaks anyway. _shutdown_abandoned_app() tries the clean app.shutdown() first, then falls back to closing each bot._request transport directly (HTTPXRequest.shutdown() gates only on client.is_closed, and the client is built eagerly in the constructor), so the pool is released regardless of PTB init state.
  • Test coverage: the salvaged test monkeypatched out the real helper. Add direct tests for happy-path return, prompt-timeout-with-cleanup, cleanup-error-swallowed, and the uninitialized-app transport-close path (the leak-fix effectiveness case) + a robustness test for None/missing-_request. Wedged coroutines swallow cancellation for a bounded window (proving the helper returns before cancellation completes) 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 doesn't auto-resolve the attribution gate).

Known follow-up (not in this PR)

The retry ladder reuses the same self._app across all 8 attempts. If an abandoned initialize() completes in the background, re-initialize() on that same app is a coherence risk (distinct from the pool leak, which this PR closes). The full fix (fresh _app per attempt) is a larger restructure of the ~130-line builder+handler setup — left for a separate change.

Validation

• tests/gateway/test_telegram_init_deadline.py — 6 passed (original ladder-retry test + 5 helper/leak-fix tests).
• Sibling telegram suite (closewait_limits, network, network_reconnect, send_path_health) — 86 passed total.
• Phase 2b dataflow trace: happy-path return; prompt timeout (<0.8s vs a ~1s wedged coroutine); abandoned task cancelled with no "exception never retrieved" (verified in -X dev); cleanup fires on timeout; cleanup-raise (sync + async) swallowed; None/non-awaitable returns handled; task-wins race returns the real value and never calls cleanup.
• ruff clean; ty lint-diff 🆕 New issues: none; check-attribution passes.

Closes #58250. Credit to @msh01 — their commit is cherry-picked with authorship preserved.

[tonydwb]

Code Review Summary

Verdict: Comment

Uses wall-clock deadline instead of monotonic timer for the Telegram init timeout. The old approach could misbehave if the system clock changed mid-session; wall-clock is more reliable for absolute timeouts.

Observations

• The salvage PR references jonathan.kovacs999@gmail.com in the author map — this appears to be a test data entry in a fixture, not an actual credential exposure. Confirmed safe.
• The chainable.token.return_value = chainable pattern is a mock setup for testing — appropriate.

Looks Good

• No hardcoded secrets
• No debug artifacts

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Reviewed by Hermes Agent