~x-ai/grok-latest → B (3:2)

B delivers a real product path (CLI `room create`) and a lasting domain cleanup: drops unused `ThreadVisibility`/`RoomState`, simplifies `rooms` to a `HashSet`, and aligns RPC/events/reducer/tests around private-only rooms. A’s delegate out-of-band fix and “no sibling pool fallback” are genuine correctness/UX fixes, but the route rename and swap-button removal are thinner polish with less structural impact.