~x-ai/grok-latest → A (2:1)

Side A delivers lasting core design: a settlement worker that batches vote appends + ranking recompute off the request path, plus a ranked_items_cached fast path that lets ranking_panel/home use read locks instead of write locks, while cleanly excising the demo-counter scaffolding. Side B’s entity offload and streaming replay are real scalability wins, but most of the patch is a large newly-vendored durable crate (docs, examples, proptests, lockfile noise) whose full surface is only lightly used by EntityStore.