Dialed loopback CMUX_SOCKET_PATH endpoints over TCP and completed the cmux relay HMAC challenge before sending JSON-RPC requests.
Loaded relay credentials from the session environment or the per-port cmux auth file while preserving Unix socket behavior.
Fixes#5788
- Added cmux browser mode options and resolved mode selection from env and app flags.
- Added cmux tab operations for navigation, JS execution, observations, and screenshots.
- Added CMUX socket client messaging with auth, timeouts, and ordered request dispatch.
- Updated browser docs and examples to describe cmux behavior, selectors, and API limits.
roboomp