preserve app-server events on cancellation

[pmbstyle]

Summary

• clean up app-server request, notification, and transport waiters on cancellation or timeout
• preserve request and terminal notification events that become ready at the cancellation boundary
• add redacted turn-event wait outcome telemetry without changing timeout policy

Root cause

External cancellation could interrupt the event wait before its child tasks were cancelled and awaited. Those leaked queue and event waiters could later consume or obscure protocol events.

Validation

• uv run pytest tests/test_codex_provider_sessions.py -q
• uv run pytest -q
• uv run ruff check .
• uv run black --check .
• uv run mypy
• git diff --check

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ce61dc9c-11c2-4830-8f2c-f7e940db7c0a

📥 Commits

Reviewing files that changed from the base of the PR and between 944aca5 and 2b2d82d.

📒 Files selected for processing (2)

• src/octopal/infrastructure/providers/codex_provider.py
• tests/test_codex_provider_sessions.py

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