{"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-sds4xnse","versions":[{"created_at":"2026-06-13T23:46:37Z","element_count":130,"note":"言葉から生成: 中庭ロの字 / 犬と暮らす土間広めの家・ドッグラン","saved_by":"mcp:create","sha256":"","version":1}]}