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I need to return only a JSON object.\n{\"winner\": \"B\", \"ratio\": \"3:2\", \"explanation\": \"Side B's scan now runs in linear time without full reducer replay (previously minutes on real logs), surfaces complete parse_error strings, and adds compile --ingest for targeted debugging; Side A improves vote-compare fullscreen layout, 2:1 ratio sorting, and post-vote preview morph but is narrower UX 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