[dmoliveira]

Summary

• serialize retry admission with durable stop mutations
• keep stop intent dominant over late pause requests while allowing explicit resume
• preserve the failed attempt and avoid creating retry evidence after stop

Validation

• uv run ruff check .
• uv run ruff format --check src/ailoop/service.py tests/test_service.py
• Python 3.11 targeted retry/stop/resume tests: 13 passed
• full suite: 421 passed, 85% coverage
• final high-risk review: GO, no critical/high/medium findings

Concurrency contract

Retry admission linearizes under the state mutation lock. A stop committed first suppresses the retry; a stop committed after admission follows normal active-run cancellation.

Runtime-Session: ses_057afdc3effemiOJ2zfmjJiDqe