{"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-6g3o8b8a","versions":[{"created_at":"2026-06-10T13:56:51Z","element_count":90,"note":"5軸GA polish 67->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c91db09f3e065b13b5a98bc63f64d713b15af746137a170401e140f857f14f7c","version":6},{"created_at":"2026-06-10T13:45:50Z","element_count":54,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"1620209028ba11cb439bd30ae562d42df0b7693bf13448b6e81bea11cb9b6346","version":5}]}