Investigate mutliple client connections

[alcarney]

Still a valid issue, but the architecture is now different - can we have multiple agents reports into a single server command?

~Since the agent is wrapped in a websocket server, there shouldn't be a reason why we can't have mutliple clients connected to the same agent.~

~Yet when I try running two separate lsp-devtools record sessions, the first mysteriously stops receiving messages once the second client connects...~