~x-ai/grok-latest → B (2:1)

B tightens core ranking behavior with clear bridge/attach/isolate priorities and rank-adjacent zip refinement, backed by targeted tests—lasting product logic rather than surface work. A’s value is real (cookie/SSR themes and private-room wire URLs) but much of the diff is mechanical layout/signature plumbing across many pages, so it is broader yet less concentrated lasting design than B’s pair-selection change.