{"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-8wjfc3k1","versions":[{"created_at":"2026-06-11T18:19:50Z","element_count":125,"note":"言葉から生成: 中庭ロの字 / アトリエ兼住居・北面ハイサイド採光","saved_by":"mcp:create","sha256":"","version":1}]}