Ease implementation for CMUX Browser.

[jasonraz]

I know some people are having difficulty getting the browser to work.
I created an MCP for this if anyone is interested.

https://github.com/jasonraz/cmux-browser-mcp

I hope some people find it useful.
It was essential for me to do FE testing on the apps I've been working on.
No more weird frameworks to deal with during regression testing.

[initialneil]

Great work. Sounds like this should an official thing of cmux.