ozkl/doomgeneric ? reverse-engineered prompt

Build me a small portable Doom launcher based on this project so it can run on a desktop platform with a simple window and keyboard input.

I want it to load a Doom WAD file, start the game, and keep updating the screen in a loop. Please wire up the basic platform pieces the project asks for, like creating the window, drawing each frame, sleeping a bit between updates, getting the current time in milliseconds, and reading key presses. If sound is easy to add, great, but if not, keep the first pass focused on getting the game playable with graphics and controls.

Use the existing Doom generic approach, and make it feel like a clean example I could build and run without a lot of extra setup. If you need to check current docs or examples online to finish the port cleanly, go ahead.