- Enhanced bridge mode to handle incoming tunnel control messages from WebSocket
- Added JSON output for tunnel_data, tunnel_response, tunnel_close messages
- Added WebSocket connection status messages (websocket_close, websocket_connection_closed)
- Updated test scripts to include tunnel control channel message testing
- Updated documentation with comprehensive examples of control channel messages
- Added new testing scenario for tunnel control channel verification

Bridge mode now properly forwards all tunnel control channel messages as JSON
through stdout, allowing external applications to monitor tunnel state and
server communications in real-time.