{"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-qhf5voik","versions":[{"created_at":"2026-07-04T11:37:57Z","element_count":257,"note":"言葉から生成: 総2階(箱) / サウナと水風呂のある家・薪ストーブ","saved_by":"mcp:create","sha256":"","version":1}]}