Expose the runa-server protocol dispatcher over newline-delimited JSON on stdin/stdout for a trusted parent process. Bound request lines to 1 MiB, return one correlated response for each valid request, and fail explicitly on malformed or oversized input. Add the mise serve task and document that this is not a network listener or an authenticated service.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>