{"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-y2x60an7","versions":[{"created_at":"2026-07-25T11:45:25Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"4902bfdf86152625e94a5648e955965c7a48f50e5ecf13d46ba1048cf7b47017","version":2},{"created_at":"2026-07-25T11:45:21Z","element_count":105,"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}]}