who-is-in-the-room

Lobby and registration visibility. Use when the user says "Who is in the lobby?" (list_room lobby) or "Who is registered for rooms?" (list_registry, operator-token only). For slash commands /rooms, /whos-here, /who, /join, /leave, prefer rooms-slash-commands — those are hard registry room commands even in 1:1 chat, not roster questions. Follow PRD §7. No Slack. No Settings UI.