~x-ai/grok-latest → B (2:5)

B adds a real CLI path (`room create`) wired to RPC and, more importantly, simplifies the lasting domain model by dropping `ThreadVisibility`/`RoomState` and making `rooms` a `HashSet` of private ids—core events, reducer, types, and tests all align. A is solid UX polish (vote-count badges, HUD unpin form, CSS, browser coverage) but does not change architecture or unlock a primary workflow the way B does.