JACoders/OpenJK — reverse-engineered prompt

Build me an open source game engine project for Star Wars Jedi Knight Jedi Academy that lets players run the original game data more reliably on modern computers. It should keep the original gameplay, saves, mods, and multiplayer behavior compatible, not rebalance anything or add big new game features. Jedi Academy should support both single player and multiplayer, and Jedi Outcast single player can be included but treated as less polished.

Make it work on Windows, Linux, and macOS, including modern 64 bit machines and Apple Silicon where possible. Please focus on stability, performance, bug fixes, and clean code that modders can use as a base for their own projects.

Include simple instructions for players explaining that they still need to own Jedi Academy, where to put the files, and how to launch it on each operating system. Look up current build docs online if you need to.