feat(p8): calendar/meeting schema + enums + events + migration
Task 8.1: 12 Calendar/Meeting tables (meeting_request, meeting, participant,
transcript, segment, summary, generic action_item + meeting link, provider
account, calendar_event, availability_window, sync_cursor) + 13 enums; migration
calendar-init. Adds calendar.meeting.requested/scheduled/reminder.queued/
summarized events. resetDb truncates the new tables. Kernel already had the
MEETING_REQUEST / MEETING_FOLLOWUP / callback.meetingRef stubs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
maaz519
21772e7611