{"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-rh3bkuur","versions":[{"created_at":"2026-06-10T13:25:30Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"b7d7b7a9c11edbdbc4ef7556af13f440f86796e8a3041250e72447609983304f","version":11},{"created_at":"2026-06-10T11:09:53Z","element_count":72,"note":"5軸GA polish 46->96 by M5 (autonomous)","saved_by":"mcp","sha256":"8a98286f2fc358db2d0da466d0ca147a99f9d64eb852e39633097837fb2d92b2","version":4}]}