Since when? Last time I looked the remote ssh plugin wasn't open source and refused to run on forks?

There is an open source reimplementation (or two?)

I thought I used this one:

https://github.com/xaberus/vscode-remote-oss

and everything just worked, though the directions on that page look complicated, so it might be the wrong project. It was in the store that ships with the open source build and was definitely open source.

Cline, Roo, and Continue all work with Codium though, so it's not a big loss.

this looks like the chromium version of vscode, so long as we're both talking about the same thing: https://vscodium.com/