~x-ai/grok-latest → A (4:1)

Commit A delivers a lasting architectural redesign: collapsing the scattered REST handlers (garden/forum/ingest/rank/etc.) into a single room-scoped RPC batch surface, splitting threads from permission rooms in the reducer/events model (ScopeId::Room, room_id+thread_tag on Ingest, forum_threads/ingests_by_scope_thread), and updating CLI + tests accordingly. Commit B is a correct and necessary but narrow bugfix that drops fake browser sentinel delegates so AgentBound no longer blocks subsequent human voters.