{"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-2h84mka9","versions":[{"created_at":"2026-06-10T13:12:04Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積103.4㎡(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":"49d31939f6559776e517590610b85dd579b032a88d2d350993061212397719fd","version":11},{"created_at":"2026-06-10T08:32:31Z","element_count":91,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4f231f76b0366f58c66d47c2ff732f8f58c0bf0db8e75f7ef24e58e40723584e","version":3}]}