{"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-willowbrookhouse-mgu8mk3q","versions":[{"created_at":"2026-08-04T18:30:32Z","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":"64f1c172da6a5207ccfd506a87f85a6f2308f384eb5b82b251602820ae6e4673","version":2},{"created_at":"2026-08-04T18:30:31Z","element_count":89,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}