fable-compiler/Fable — reverse-engineered prompt

I want this repo set up so I can actually run it and verify the compiler works end to end.

Please get the project building in the easiest reliable way, using the dev container if that saves time, or local setup if that is simpler. Install whatever the README says is needed, then run the main build and any sensible checks or tests. After that, make a tiny F# example and use it to prove the compiler can output JavaScript first, and if the repo already supports them here, also show the other targets like TypeScript, Python, Rust, Erlang, and Dart working at least as a basic smoke test.

When you are done, leave me with a clean, repeatable setup and short notes on exactly how to run the build and try the sample myself. If something is too heavy to fully verify, say what you got working and what is still unconfirmed. Look up current docs online if you need to.