Rename the server crate and executable to runa and the REPL to runa-cli. Parse executable arguments with Clap derive/env, default the server to loopback port 3737, and support RUNA_LISTEN and RUNA_CONNECT with explicit flag precedence.
Remove the stdio transport and child-process client. Make mise start launch the server and mise cli launch the REPL, updating extension integration runners and documentation.
BREAKING CHANGE: runa now starts the WebSocket image server rather than the REPL; use runa-cli for the REPL. The runa-server package, stdio transport, LocalClient, ProtocolClient, and serve/serve-network mise tasks are removed.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
