NoboKik/Achilles ? reverse-engineered prompt

Build me a Minecraft 1.21.4 client called Achilles that can be compiled from source and packaged into a runnable JAR.

I want it to feel like a polished hybrid client, with a clean in game experience, a simple way to manage features, and the usual client side quality of life stuff people expect. Please make it easy to build with Gradle and keep the project organized so it’s maintainable.

If anything is unclear from the codebase, check the current docs online and follow the right Minecraft 1.21.4 setup. Keep the UI and menus simple but good looking, and make sure the client starts cleanly without errors. Also make it straightforward to add or change modules later, since I may want to extend it after the first pass.

After you’re done, I should be able to run the build and get the JAR in the build output folder.