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I need to return only a JSON object.\n{\n  \"winner\": \"A\",\n  \"ratio\": \"3:1\",\n  \"explanation\": \"Side A removes the 1405-line monolithic forum.rs (which duplicated logic now split across feed.rs, ingest.rs, page.rs, paginator.rs, post_single.rs, profile.","reasoning_details":[{"type":"reasoning.summary","summary":"The user wants me to compare two commits and decide which contributed more lasting value to the project. 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