{"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-mdfstaoz","versions":[{"created_at":"2026-07-31T12:39:07Z","element_count":254,"note":"言葉から生成: 中庭ロの字 / ピアノ室と防音・吹抜のある家","saved_by":"mcp:create","sha256":"","version":1}]}