{"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-n3e9x25t","versions":[{"created_at":"2026-08-05T04:09:01Z","element_count":172,"note":"言葉から生成: 総2階(箱) / ピアノ室と防音・吹抜のある家 / 吹抜(LDK) / 独立防音室(ピアノ) / 雪下ろし用バルコニー / 高気密高断熱仕様","saved_by":"mcp:create","sha256":"","version":1}]}