{"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-zec69e8u","versions":[{"created_at":"2026-06-17T15:59:16Z","element_count":146,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 南面吹抜 / 北側に坪庭 / 高欄付きバルコニー / 防風シャッター","saved_by":"mcp:create","sha256":"","version":1}]}