{"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-5g8wtn9e","versions":[{"created_at":"2026-08-02T07:16:24Z","element_count":236,"note":"言葉から生成: L字 / 越屋根のある自然素材の家・通風重視","saved_by":"mcp:create","sha256":"","version":1}]}