feat(brain): add Domain Event Bus and emit events from 5 pilot modules

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Phase 1 of the Companion Brain architecture. Introduces a typed,
synchronous event bus with microtask-scheduled handlers, an append-only
event store persisted to IndexedDB (_events table, v10 schema), and
semantic domain events emitted from module stores.

Pilot modules with emit() calls:
- Todo: TaskCreated, TaskCompleted, TaskUncompleted, TaskDeleted, SubtasksUpdated
- Calendar: CalendarEventCreated, CalendarEventUpdated, CalendarEventDeleted
- Drink: DrinkLogged, DrinkEntryDeleted, DrinkEntryUndone
- Nutriphi: MealLogged, MealFromPhotoLogged, MealDeleted
- Places: PlaceCreated, PlaceDeleted, PlaceVisited, LocationLogged,
  TrackingStarted, TrackingStopped

Also includes the full architecture plan at
docs/architecture/COMPANION_BRAIN_ARCHITECTURE.md.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Till JS 2026-04-13 20:25:46 +02:00

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