{"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-ybk3yiok","versions":[{"created_at":"2026-08-20T15:36:43Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a3ff2fe13a49878631322120dc8392d4ea724a2ee9cac979baa7d01dfb89f81b","version":2},{"created_at":"2026-08-20T15:36:30Z","element_count":86,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}