{"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-cr2pva3u","versions":[{"created_at":"2026-07-02T19:55:05Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"66757aa4646ec0a123ce8829eba79ece15d6a1bb038bffe5d2d970ca1b8222d5","version":3},{"created_at":"2026-07-02T19:46:33Z","element_count":89,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"aa83e08c5312e0646238d767f2ee8d1e89a5d84b1ca4d29c39b3458aab26e624","version":2},{"created_at":"2026-07-02T19:46:33Z","element_count":89,"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}]}