Team-lead-only mutation that replaces the AttendingMember roster on a
CONFIRMED finalist confirmation. Diffs the requested user list against
existing rows: kept rows are updated in place (preserving FlightDetail),
removed rows are deleted, added rows are created. Enforces:
- team-lead role
- CONFIRMED status
- defaultAttendeeCap
- team-membership of every supplied userId
- cutoff = LIVE_FINAL.windowOpenAt − attendeeEditCutoffHours (default 48)
Audit-logged as FINALIST_EDIT_ATTENDEES with the diff payload.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
