{"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-exgmoj04","versions":[{"created_at":"2026-06-10T13:13:02Z","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":"86feadc21d915b7a69371de04cffa7cfcaaa48511c8c3b6acf56c62d61a332a1","version":11},{"created_at":"2026-06-10T08:48:37Z","element_count":74,"note":"5軸GA polish 52->95 by M5 (autonomous)","saved_by":"mcp","sha256":"0718c7b5f436fda4aa3409b3058bdba0c994497ce78007280d15ca96d5164931","version":3}]}