{"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-onbl640n","versions":[{"created_at":"2026-08-14T14:37:35Z","element_count":101,"note":"loop3: 設計時延床 40.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"85c251efad300aa82278c651903da2660478e6035ee5910a179c535f52e7dc8c","version":2},{"created_at":"2026-08-14T14:37:34Z","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}]}