The hello-world example (At least in Objective-C) shows a 'run-envoy' call followed by the client code making requests to envoy in the same process over HTTP on a dedicated port. Will there be a client API or is the model that one uses a local HTTP client to speak to your in-process envoy?
Yes, we are immediately starting work on a direct, client API. Getting this linked as a library and functional in iOS and Android apps was merely our proof-of-concept and first step.