cariad/differently ? reverse-engineered prompt

Build me a small Python tool called differently that helps me visually compare two things and see what changed in a simple, readable way.

I want a command line app where I can pass in two files and get a clear side by side diff style view, with added, removed, and changed lines easy to spot. It should work well for plain text, and also handle JSON and YAML files. Please include a Python library version too, so I can use the same comparison logic from my own scripts.

Make it feel polished and friendly, with a basic example I can run right away from the command line. If you need to check the latest docs for anything, look them up online. I’d also like tests included, and a few sample files so I can see how it behaves.