untransformOutcome
open suspend override fun <S> untransformOutcome(data: CallData<S>, channel: SerializedService<S>, decodeError: (CallData.Error<S>) -> Throwable): Result<O>
Client-side boundary hook (issue #133). Invoked by RpcMethod.callChannel with the raw wire response (which may be a CallData.Error). The default implementation throws the decoded error — preserving today's behaviour — and otherwise delegates to untransform. ResultTransformer overrides this to wrap the outcome in a kotlin.Result instead of throwing.
Implementations MUST rethrow CancellationException.