Lock-in on exe.dev

As long as it runs on Linux, exe.dev supports it. It's just a computer, after all.

Our platform and our coding agent don't believe in limiting you to just one framework. If you have a set of frameworks and libraries you prefer, use them. If you need to migrate off to another provider, rsync will get you pretty far.

Our default VM image is exeuntu. The Dockerfile is right there. If you prefer a different flavor, that's great, go for it.