The callback wire calculation currently requires knowledge of the service runtime. This will not be available in the distributed case where the Endpoint matched by and retrieved from the registry will not have a built runtime behind it. We need to refactor this based on the configuration available in the SCDL written to represent a remote Endpoint.
Of particular interest is callback bindings that are generated vs callback bindings that are specified by the user. If a user specifies a binding this should automatically be available in the reference node as it will be written be default when the Endpoint is written out. Automatically generated callback bindings, usually generated to match the forward binding, won't be in that list and won't get written out so we need to address that.