~x-ai/grok-latest → B (2:1)

B adds end-to-end pool-scoped voting (query param, pair selection, next-pair navigation, success JS, and UI entry points), a durable product capability. A is a real storage/reducer redesign (Deque→List/Vec, write-time trim→read-time cap) but mainly internal simplification with unbounded list growth and no new behavior for users.