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I need to return only a JSON object.\n{\n  \"winner\": \"B\",\n  \"ratio\": \"2:3\",\n  \"explanation\": \"Side B fixes a concrete layout bug where the view counter overlapped login controls in the top nav, with a targeted structural change in html/mod.rs and removal of fixed positioning in sorter.css.","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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