{"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-1rae8fmk","versions":[{"created_at":"2026-06-10T13:12:44Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"75faa2b4a9cdb240358ea02027e4333895acec0d7b9012d8afc3a64768619d6b","version":11},{"created_at":"2026-06-10T08:48:53Z","element_count":84,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"060086dc5059d3d58f9029add6e3147c558e6a60699ed89a24328d0766cce10f","version":3}]}