New CLI commands: ls, create, kill, capture (tmux capture-pane style with
line range slicing and ANSI stripping), and send-keys (with special token
interpretation). Server-side adds capture_terminal_request RPC and
list-all-terminals support (optional CWD). Includes e2e tests and skill docs.
Client-side xterm.js was generating Device Attributes responses via
onData, which fed back to the PTY as visible text. Register CSI handlers
to consume query responses on the client and respond to DA1 on the server.