{"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-auditfixedtimberhome-o6sndvyf","versions":[{"created_at":"2026-09-20T06:48:23Z","element_count":85,"note":"言葉から生成: 3LDK 平屋 平屋 デッキ","saved_by":"mcp:create","sha256":"","version":1}]}