~x-ai/grok-latest → A (4:1)

Side A delivers the structural ItemId enum (with item_wire split), fully migrating reducer maps, ranking, RPC, HTML routing, and tests off CanonicalItemUrl—core lasting identity design. Side B adds a valuable /vote compare UX, bridge-aware pair picker, and morph path, but is a feature layer on top rather than foundational type/architecture work.