~x-ai/grok-latest → A (4:1)

A adds a real settlement worker (batched vote apply, JSONL append, score recompute), ranking cache + read-lock fast path, and deletes the demo-counter scaffold—structural correctness for persistence and HTTP latency. B only retunes rank-row colors from list ordinal to min–max score within a group, a small UI polish with local tests and no core data-path change.