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I need to return only a JSON object with winner, ratio, and explanation.\n{\n  \"winner\": \"A\",\n  \"ratio\": \"3:1\",\n  \"explanation\": \"Side A delivers a focused algorithmic improvement to pair selection logic (bridge preference, attach-isolate tiebreak, zip refinement) with new tests and clear comments, directly enhancing ranking UX. Side B performs a broad 100+ line refactor splitting identity handling, updating wire formats, and touching 15+ files for API consistency. A provides more lasting product value; B is valuable architectural cleanup but more infrastructural.","reasoning_details":[{"type":"reasoning.summary","summary":"The user wants me to compare two commits and decide which contributed more lasting value to the project. I need to return only a JSON object with winner, ratio, and explanation.\n{\n  \"winner\": \"A\",\n  \"ratio\": \"3:1\",\n  \"explanation\": \"Side A delivers a focused algorithmic improvement to pair selection logic (bridge preference, attach-isolate tiebreak, zip refinement) with new tests and clear comments, directly enhancing ranking UX. Side B performs a broad 100+ line refactor splitting identity handling, updating wire formats, and touching 15+ files for API consistency. A provides more lasting product value; B is valuable architectural cleanup but more 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