When mom responds with just [SILENT], the status message is deleted and nothing is posted to Slack. Useful for periodic events that check for activity but find nothing to report.
- Three event types: immediate, one-shot, periodic (cron) - Events are JSON files in workspace/events/ - EventsWatcher with fs.watch, 100ms debounce - Queue integration via SlackBot.enqueueEvent() (max 5) - Fix setTyping race condition causing duplicate messages - System prompt documents events for mom - Design doc in docs/events.md - Add croner dependency for cron scheduling