~x-ai/grok-latest → B (2:3)

B replaces the ad-hoc composable normalizer pipeline (engine.rs + host switch) with a graph/DFA-based URL identity and hierarchy model, which is core lasting design for ItemId canonicalization across the project. A is a real but narrower storage/reducer change (Deque→List, trim-on-write→cap-on-read, schema 4 + test) on recent_votes only, so less project-wide leverage than B’s identity-layer rewrite.