{"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-0wqlnkj4","versions":[{"created_at":"2026-08-14T14:40:55Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0374117de3c32dfbc08eeeb7e9b43c7f7513a9994c0471001bf0e1ca0b06ef6c","version":2},{"created_at":"2026-08-14T14:40:55Z","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}]}