Following up again:
So, trellis up now works and it does appear to build it all out correctly.
I still can’t reach the domain in the browser. mysite.test just returns “can’t connect”, and it happens immediately.
If I run curl mysite.com in the in WSL, it returns Wordpress-like HTML, so that seems to work.
Do I need to manually update the Windows hosts file? If so, with what? The IP for vagrant?
EDIT: To answer my own question, apparently Trellis is supposed to edit the hosts file, but with it being Windows, this process can be unreliable. The test domain should point to the IP of the VM. I’ll try that today when I get home. Discourse source