{"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-8xlmuvvv","versions":[{"created_at":"2026-06-15T21:05:57Z","element_count":169,"note":"言葉から生成: 総2階(箱) / ロフト付きワンルーム・吹抜・大開口 / ロフト / 吹抜 / 大開口 / 採光確保 / 熱橋断熱","saved_by":"mcp:create","sha256":"","version":1}]}