{"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-ia9ivg8d","versions":[{"created_at":"2026-07-27T03:54:39Z","element_count":210,"note":"言葉から生成: L字 / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 高耐力サッシ / 雪対策(勾配屋根)","saved_by":"mcp:create","sha256":"","version":1}]}