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I need to return only a JSON object.\n{\n \"winner\": \"A\",\n \"ratio\": \"20:1\",\n \"explanation\": \"Side A removes the 1405-line monolithic forum.rs (leftover duplicate) and splits the forum logic into a clean module tree (forum/feed.rs, forum/ingest.rs, forum/nav.","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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