{"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-ilme8uu7","versions":[{"created_at":"2026-06-16T16:12:31Z","element_count":260,"note":"言葉から生成: L字 / 犬と暮らす土間広めの家・ドッグラン","saved_by":"mcp:create","sha256":"","version":1}]}