{"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-yams61xt","versions":[{"created_at":"2026-07-05T19:03:39Z","element_count":246,"note":"言葉から生成: 総2階(箱) / 犬と暮らす土間広めの家・ドッグラン / 吹抜土間 / ドッグラン / 厚い壁 / 高窓","saved_by":"mcp:create","sha256":"","version":1}]}