{"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-a7ghj4ab","versions":[{"created_at":"2026-08-15T11:48:13Z","element_count":101,"note":"loop3: 設計時延床 56.9㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a6a05f1795d487241f69f62f170a26822b8ca699128bfed51553052c019d9eb2","version":2},{"created_at":"2026-08-15T11:48:13Z","element_count":101,"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}]}