Design solo-to-solo communications protocol

[michaelfig]

What is the Problem Being Solved?

We want to have a coherent design for communications between multiple ag-solos and a sim-chain. This lies somewhere on the spectrum of solo-to-chain and solo-to-solo, so we should consider how we want to express that spectrum. Then, we should pick the simplest thing that could work.

Description of the Design

We prefer to in order to make agoric start behave similarly to the current state (but actually starting two processes under the hood that communicate over a localhost TCP port). Then agoric start dev-client 8001 would add another solo client to the same sim-chain, so that we can have an arbitrary number of solo clients for the same sim-chain.

Security Considerations

Test Plan