facebook/hermes ? reverse-engineered prompt

I want to get Hermes built locally from source and make sure I can run its command line tool on my machine.

Please set up the project so I can compile a debug build, run a simple JavaScript file through the Hermes CLI, and verify everything works end to end. If anything depends on current build docs or platform specific steps, check the latest instructions online and follow whatever is needed for my system.

After that, give me a clean way to run a tiny test script like a hello world example, and make sure the build is set up in a sensible default state for development. If there are any obvious issues, missing setup steps, or things I should know before hacking on Hermes itself, point them out and fix what you can.