Add worker system and enhance event bus with comprehensive features

- Created worker.zod.ts with task queues, priorities, retry logic, and batch processing
- Enhanced events.zod.ts with event priorities, filtering, queuing, sourcing, and integrations
- Added comprehensive test coverage for all new features
- All 2955 tests passing including 39 worker tests and 53 event tests

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot