{"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-onf4e30p","versions":[{"created_at":"2026-06-29T14:21:58Z","element_count":222,"note":"言葉から生成: L字 / 二世帯住宅・玄関2つ・水回り分離 / 吹抜 / 光庭 / 外部階段","saved_by":"mcp:create","sha256":"","version":1}]}