~x-ai/grok-latest → B (3:1)

B lands lasting core design: hierarchical ItemId/GlobalTree, path canonicalization, journaled tree votes, and UI (breadcrumbs/entity panel) that replace flat string scopes—foundational product capability. A is a correct, necessary ordering fix (zero-ratio return before ensure_item/voted_pairs) with tight tests, but it is a localized guard versus B’s structural model change.