SNMetamorph/PrimeXT ? reverse-engineered prompt

Build me a modernized toolkit for the Xash3D FWGS engine that helps Half Life mod makers create a more polished game experience.

I want it to run on Windows and Linux, with a build that compiles cleanly and a working playable baseline. The main focus should be better graphics and physics, with support for things like HDR, dynamic lighting and shadows, normal and parallax mapping, post processing like bloom and depth of field, and PhysX based physics. Keep it compatible with GoldSrc style mods and the existing game content, but modernize the look and feel as much as possible without breaking the basics.

Please set up the project so it can be built from a fresh clone, and make sure the engine, client, server, shared game code, and launcher pieces all work together. If anything is unclear, check the current docs online or the existing build setup and follow that.