{"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-q5u31w9q","versions":[{"created_at":"2026-06-23T23:45:14Z","element_count":132,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 高断熱サッシ / 雪対策屋根勾配45° / 全室暖房対応","saved_by":"mcp:create","sha256":"","version":1}]}