roysmanfo/flux ? reverse-engineered prompt

Build me Flux, a cross platform terminal app in Python that feels like a Unix like command center and comes with a bunch of useful built in commands for everyday tasks.

I want it to install cleanly, launch from the command line, and work on both Linux and Windows. Make it easy to add new commands later, so someone can write their own scripts and plug them in without much hassle. Keep the project organized so the main app, docs, and tests are all in place, and include a simple way to run it locally for development.

If you need to, look up current Python docs or best practices online, but keep the app lightweight and practical. Also make sure there is a clear help experience so users can discover what each command does and how to use Flux right away.