FEX-Emu/FEX — reverse-engineered prompt

Build me a fast Linux app for ARM64 that lets me run regular x86 and x86 64 programs, kind of like a user mode compatibility layer. I want it aimed at real use on ARM devices, especially Ubuntu, and it should handle both 32 bit and 64 bit apps with good compatibility. If possible, make it smart about performance by forwarding graphics related calls to the host when that helps, using a code cache to cut down stutter, and letting me tweak settings per app or game.

Please include an easy setup flow that can download or prepare the needed x86 64 root filesystem, plus a simple config tool so I can change options without editing files by hand. It should also be usable alongside Wine or Proton for Windows games where that makes sense.

Keep it practical and focused on ARM64 Linux. If you need details, check the current docs and wiki online and wire everything together so it feels polished and usable.