{"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-83gysl9z","versions":[{"created_at":"2026-06-10T13:14:20Z","element_count":62,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"30f2e396e663192a333f4fe419190d0b741f3755e54e2c54d9e378a05dabd32a","version":10},{"created_at":"2026-06-10T09:05:53Z","element_count":90,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2c51c526900e6ebbba81f3c56ff5e7e9ae0deb27a70aa698f11b3d29cb17c015","version":2}]}