a18fc3493a
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>