{"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-3lyffovn","versions":[{"created_at":"2026-08-04T19:37:54Z","element_count":86,"note":"loop3: 設計時延床 65.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"bc9553d8ee70f4bee9fc6ebe9b844cd25df3321179a15dd7463885632c39b702","version":2},{"created_at":"2026-08-04T19:37:54Z","element_count":86,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}