{"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-8w1qcd4i","versions":[{"created_at":"2026-08-14T09:08:40Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"5337fb69a1f9d06fd9a9800790c75357230f16ec0cbb99dea2922b02c9fe8bb5","version":2},{"created_at":"2026-08-14T09:08:39Z","element_count":87,"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}]}