- Add CalendarScheduler class to manage periodic heartbeat and slot execution
- Implement agent wakeup logic when Idle and slots are pending
- Handle slot status transitions (attended, ongoing, deferred)
- Support both real and virtual slot materialization
- Add task context building for different event types (job, system, entertainment)
- Integrate scheduler into main plugin index.ts
- Add new plugin tools: harborforge_calendar_status, complete, abort
