- Move httpx import to top-level and use anyio task group for concurrent
validation in cleanup_invalid_app_passwords (storage.py)
- Respect Retry-After header for 429 responses, capped at 300s (oauth_sync.py)
- Soften pre-validation exceptions so transient failures don't crash the
background sync task (oauth_sync.py)
- Replace f-string SQL with blanket DELETE and add returncode checks (conftest.py)
- Extract clear_stale_test_state() helper to deduplicate cleanup logic
in astrolabe background sync tests
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>