~x-ai/grok-latest → B (3:2)

B lands lasting product architecture: billing-weight reactor changes (Ingest room_id+thread_tag, ScopeId::Room, RoomCreated/grants, forum keyed by (scope, tag)) plus a single batch RPC surface and CLI public/private scoping that replace the scattershot REST handlers. A’s ItemId migration is a valuable, correct design cleanup (enum identity through reducer/ranking/HTML and dropping CanonicalItemUrl/plan.md), but it largely re-expresses existing canonical-string keys rather than expanding what the system can do.