#35994 moved /new reset cleanup off the loop, but _cleanup_agent_resources
(agent.close() subprocess teardown; shutdown_memory_provider() plugin IO) was
still called INLINE on the event loop from three other sites:
- _session_expiry_watcher (5-min idle sweep) — live loop
- _handle_message_with_agent cache-hygiene re-eviction — live loop
- _finalize_shutdown_agents / stop() idle-cache loop — shutdown
A wedged memory provider on any of these froze the loop: bot goes silent,
runtime-status updated_at heartbeat stops advancing, and SIGTERM can't be
serviced (requires kill -9) — exactly the #53175 zombie pattern.
Adds _cleanup_agent_resources_off_loop: a bounded (30s) worker-thread offload
mirroring the #35994 reset fix, and routes all four sites through it.
Remove unused imports (F401) and duplicate/shadowed import
redefinitions (F811) across the codebase using ruff's safe
autofixes. No behavioral changes -- imports only.
- ~1400 safe autofixes applied across 644 files (net -1072 lines)
- __init__.py re-exports preserved (excluded from F401 removal so
public re-export surfaces stay intact)
- Re-exports that are imported or monkeypatched by tests but look
unused in their defining module are kept with explicit # noqa:
F401 (gateway/run.py load_dotenv; run_agent re-exports from
agent.message_sanitization, agent.context_compressor,
agent.retry_utils, agent.prompt_builder, agent.process_bootstrap,
agent.codex_responses_adapter)
- Unsafe F841 (unused-variable) fixes deliberately skipped -- those
can change behavior when the RHS has side effects
- ruff lints remain disabled in pyproject.toml (only PLW1514 is
selected); this is a one-time cleanup, not a config change
Verification:
- python -m compileall: clean
- pytest --collect-only: all 27161 tests collect (zero import errors)
- core entry points import clean (run_agent, model_tools, cli,
toolsets, hermes_state, batch_runner, gateway)
- static scan: every name any test imports directly from an edited
module still resolves
