{"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-iejay7yf","versions":[{"created_at":"2026-06-10T22:58:04Z","element_count":77,"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":"7c54af7d74801517d23c50ead81a007fb149641b3f04f1db8b5bdd11bec60541","version":9},{"created_at":"2026-06-10T19:50:50Z","element_count":84,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"7ab8d6215ec0a7dd7fe4b06170a5148303b82a08d0c6b1a0792138796977734a","version":2}]}