Add runa-client for launching the JSON-lines server as a child process and exchanging bounded, correlated protocol requests. Validate response versions and request IDs, expose graceful shutdown, and test the client against the real server process. Clarify that VS Code is planned to use an authenticated network connection to the same live image, while stdio serves local child-process integrations and actors remain in the image.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
