{"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-m8z5io8d","versions":[{"created_at":"2026-08-01T00:49:28Z","element_count":145,"note":"言葉から生成: 総2階(箱) / ピアノ室と防音・吹抜のある家 / 吹抜付きLDK / 防音仕様ピアノ室 / 深雪対策深基礎 / 南面最大化採光","saved_by":"mcp:create","sha256":"","version":1}]}