- Add threading.Event-based cancellation mechanism to Crew class
- Implement cancel(), is_cancelled(), and _reset_cancellation() methods
- Add cancellation checks in _execute_tasks() main execution loop
- Handle cancellation in async task processing (_process_async_tasks)
- Create CrewKickoffCancelledEvent following existing event patterns
- Add comprehensive tests for cancellation functionality
- Support graceful shutdown allowing current task to complete
- Ensure thread-safe cancellation across sequential and hierarchical processes
Fixes#3445
Co-Authored-By: João <joao@crewai.com>
3a54cc859a