~x-ai/grok-latest → A (2:1)

A redesigns recent-vote persistence (Deque/VecDeque → List/Vec, schema 3→4), dropping write-time trim and parent tracking in projection_apply in favor of append-only writes with a query-time cap plus a test—lasting data-model simplification. B is a solid UI bugfix (per-group rank gradients, center-anchored slider polarity, history HUD parity) with good tests, but it is presentation-layer polish rather than durable core design.