Cross-resource read routing override — return a client for the parsed
GDR's resource, or undefined to let the engine route it. Serving a
resource also declares it on the written-ref surface, so narrowing this
resolver rejects refs to resources it stops serving; engine verb scopes
also rebind any returned client onto their own API version.
Cross-resource read routing override — return a client for the parsed GDR's resource, or
undefinedto let the engine route it. Serving a resource also declares it on the written-ref surface, so narrowing this resolver rejects refs to resources it stops serving; engine verb scopes also rebind any returned client onto their own API version.