{"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-x964y1xb","versions":[{"created_at":"2026-07-26T15:00:20Z","element_count":168,"note":"言葉から生成: 総2階(箱) / ピアノ室と防音・吹抜のある家 / South-facing light well with operable skylight / South-east music room with STC-50 insulation and floating floor / South living with 1.5x light well opening / South-east light well with planter box","saved_by":"mcp:create","sha256":"","version":1}]}