{"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-ry9emqti","versions":[{"created_at":"2026-06-10T13:12:03Z","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":"02f39912cfb5b903e13f0f0745e722a954c04285e8435a358e7affc63c650f91","version":11},{"created_at":"2026-06-10T08:32:20Z","element_count":72,"note":"5軸GA polish 57->96 by M5 (autonomous)","saved_by":"mcp","sha256":"43424c15bb5c22bb8061dce0dc37760608baaddfe7da9b013dbafda2ad2d9235","version":3}]}