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I need to return only a JSON object.\n{\n  \"winner\": \"B\",\n  \"ratio\": \"2:3\",\n  \"explanation\": \"Side B's scan now avoids full replay (key for large logs), surfaces parse_error details in malformed ingest reports, and adds compile --ingest for targeted debugging; Side A refactors fetch to SSE but 1) deletes tests, 2) adds logging churn, 3) moves entity_section/html helpers to fetch module (some duplication remains). B's changes are more precise, lasting tooling improvements.","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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