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I need to return only a JSON object.\n{\n  \"winner\": \"A\",\n  \"ratio\": \"2:1\",\n  \"explanation\": \"Side A fixes a critical correctness bug: Shared WEB_BROWSER_AGENT was bound on first vote and blocked every later human vote; Side B removes demo scaffolding and adds settlement/ranking cache. Side A delivers lasting 2-user browser voting design (Option<String> agent, removed sentinel logic, updated authorship_attr) with integration tests; Side B is architectural cleanup but the demo removal is noise and settlement is preemptive infrastructure.","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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