Implement graceful shutdown handling for the async pipeline with proper
signal trapping and cleanup coordination.
Features:
- GracefulShutdown class with SIGTERM/SIGINT signal trapping
- Async event-based shutdown coordination
- Configurable shutdown timeout (default: 30 seconds)
- Cleanup callback registration (sync and async)
- Force exit on second signal
- Async context manager support
- Platform-specific signal handling (Unix/Windows)
Integration:
- Updated __main__.py to use GracefulShutdown wrapper
- Pipeline cleanup registered as shutdown callback
- Proper logging of shutdown stages
Tests: 25 new tests covering signal handling, timeouts, cleanup callbacks,
and context manager behavior.
Closes#56🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Patrick Selamy