{"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-7lot2440","versions":[{"created_at":"2026-07-04T07:38:59Z","element_count":209,"note":"言葉から生成: 総2階(箱) / 二世帯住宅・玄関2つ・水回り分離 / 吹抜け / 温水床暖房 / 高断熱仕様(Ua=0.47) / スノーメルト","saved_by":"mcp:create","sha256":"","version":1}]}