feat(p8): CalendarService — 3 genesis paths converge on schedule
Task 8.2: requestMeeting + fromCallback (bridge) + fromEventClaim (accepted P7
AI EVENT claim, human-confirmed) + direct scheduleDirect. schedule() fails closed
via opa, creates meeting + organizer/attendee participants + calendar_event,
closes the request, and populates IiosCallbackRequest.meetingRef when bridged.
5 tests: direct/callback/AI genesis, un-accepted claim refused, opa-deny fail-closed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
maaz519
6edb0cc0cc