{"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-tgyzbj6l","versions":[{"created_at":"2026-06-10T14:29:23Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"61ed2ab95cbab98fcbe5456065bb65cc88924916ea81cd74a6f4437de815a6b9","version":7}]}