{"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-9ecus3ay","versions":[{"created_at":"2026-06-10T13:18:48Z","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":"1f06ecfc5583749835098b5db5bdf3283b57ed53bd908eb85931e90fc3f4d2bc","version":10},{"created_at":"2026-06-10T10:09:38Z","element_count":85,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ae344d32a72b5aab325f296f991dbe04c565ac0f21eae5a1cade03db27d8024d","version":2}]}