PLG-CAL-002: Implement calendar scheduler for agent slot wakeup

- 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

plugin/calendar/index.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["index.ts"],"names":[],"mappings":"AAAA;;;;;;;;;;;;;;;;;;;;;;;;;;;;GA4BG;AAEH,cAAc,SAAS,CAAC;AACxB,cAAc,mBAAmB,CAAC;AAClC,cAAc,aAAa,CAAC"}