~x-ai/grok-latest → A (3:1)

A replaces Deque/write-time trim with an append-only List and query-time cap (schema 3→4), deletes post-apply trim/BTreeSet bookkeeping, and adds a focused cap test—lasting storage design. B is valuable UI work (fullscreen shell, edge-history sort/display, success morph/CSS) but remains presentation-layer polish over a narrower surface.