{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-ii1h1kxh","versions":[{"created_at":"2026-06-10T22:52:47Z","element_count":66,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"5c714b5749e78a33ab5cbcbde118ddd7b6c31f3f477ce9c3180ff59a44aab36d","version":10},{"created_at":"2026-06-10T16:09:07Z","element_count":84,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"98f18b9ba9a1da56e84a057797ed7077dd96daa2a2b336cc03d9f7c166ae11f8","version":2}]}