{"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-kc1i0z7j","versions":[{"created_at":"2026-08-17T10:34:32Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"fef0e2ae4a02a58fea7984a2efc9abb5d96da4e8465a38cbf50c221c15edd98e","version":2},{"created_at":"2026-08-17T10:34:31Z","element_count":88,"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}]}