{"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-e0jqhzue","versions":[{"created_at":"2026-07-15T03:58:49Z","element_count":147,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 中央吹抜 / 背面坪庭 / 軒張り5m / 耐震等級3 / 太陽光発電","saved_by":"mcp:create","sha256":"","version":1}]}