~x-ai/grok-latest → B (1:3)

B re-architects the core product around room-scoped content (ThreadCreated→RoomCreated, Ingest room_id/thread_tag, ScopeId::Room, forum vs room indexes) and replaces scattered REST handlers with a batch RPC surface plus CLI public/private routing—foundational, test-backed design. A is a solid but narrower feature: explicit Reddit entity fetch, Event::EntityImported with raw payload replay, and UI/fetch controls; valuable, yet not project-defining like B's API/reducer model change.