{"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-4k3kh71e","versions":[{"created_at":"2026-07-22T13:21:30Z","element_count":142,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 中央吹抜 / 坪庭 / 高耐性サッシ / 庇の設置","saved_by":"mcp:create","sha256":"","version":1}]}