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I need to return only JSON.\n{\n  \"winner\": \"B\",\n  \"ratio\": \"1:2\",\n  \"explanation\": \"Side B's dequeue->vec change is a lasting data-model refactor: it replaces VecDeque/Deque with List, moves RECENT_VOTES_CAP from write-time trim to read-time slicing, removes the post apply trim_recent_votes call, and bumps schema version. Side A is surface-level UI fixes (out-of-band delegate_opt, sibling-pool error instead of fallback, swap-button removal, route rename) that improve correctness and UX on one page but don't alter core storage or projection logic.","reasoning_details":[{"type":"reasoning.summary","summary":"The user wants me to compare two commits and decide which contributed more lasting value. 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