{"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-epp6558h","versions":[{"created_at":"2026-06-30T12:08:03Z","element_count":207,"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","saved_by":"mcp:create","sha256":"","version":1}]}