{"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-dijcab0m","versions":[{"created_at":"2026-07-16T03:43:59Z","element_count":209,"note":"言葉から生成: 総2階(箱) / ピアノ室と防音・吹抜のある家 / 中央吹抜 / 独立防音室(ピアノ) / 高気密・高断熱仕様 / 南面大型窓","saved_by":"mcp:create","sha256":"","version":1}]}