~x-ai/grok-latest → A (2:1)

A redesigns core projection storage (Deque→append-only List, write-time trim→read-time cap, schema v4) and deletes projection_apply trim bookkeeping, with a concrete load-cap test—lasting data-path simplification. B improves auth UX via fragment morphs and shared layout, but is surface UI/JS plumbing without comparable structural impact.