feat: RoomUpdate protocol — broadcast participant list on join/leave

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- Add RoomUpdate signal message to wzp-proto with participant count + list
- Add RoomParticipant struct (fingerprint + optional alias)
- Store fingerprint/alias in relay Participant struct
- Broadcast RoomUpdate to all room members on join and leave
- Add signal recv task in Android engine to handle RoomUpdate
- Surface room_participant_count + room_participants in CallStats JSON
- Show "X in room" with participant names in Android in-call UI

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Claude

2026-04-05 18:12:24 +00:00

parent a23d9f5e41

commit 2d4b8eebd5

9 changed files with 187 additions and 16 deletions

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