{"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-hjol83as","versions":[{"created_at":"2026-07-01T11:23:51Z","element_count":150,"note":"言葉から生成: L字 / サウナと水風呂のある家・薪ストーブ","saved_by":"mcp:create","sha256":"","version":1}]}