{"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-53vctg8z","versions":[{"created_at":"2026-06-10T13:25:35Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積92.5㎡(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":"4907649b8e71ca54c88c8a0671cc1c13cf6bd00a104bc417833cccafd52187e1","version":11},{"created_at":"2026-06-10T11:09:51Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f90fe30811aa9d354de59909da315d3a11161e73c99317108268730c333bf233","version":4}]}