~x-ai/grok-latest → B (1:7)

B reshapes the product around a hierarchical ItemId/GlobalTree model (path canonicalization, parent/child wiring, NodeEnsured, journal-backed votes, breadcrumbs/UI), a lasting architectural shift; A only swaps recent_votes Deque/VecDeque for append-only List/Vec with read-time capping and drops write-time trim—a correct but narrow storage simplification.