S2 coordination readiness
Coordination consequences are visible, not executable.
This room can show read-only readiness for announcements, viewer grants, no-show review, audit receipts, and notification consumers. It does not create rows, persist events, or send notifications.
S2.1 keeps writes blocked: no announcement row, viewer-grant row, no-show case, audit event, notification, refund, settlement, or payout is created here.