apple/ml-sharp — reverse-engineered prompt

I want this repo set up so I can point it at a photo or a folder of photos and get a usable 3D Gaussian scene out the other end as .ply files, with a simple command line flow that actually works end to end. Please wire up the install, make sure the main sharp command runs, and keep the first run smooth by automatically downloading the model checkpoint and caching it locally, but also let me pass my own checkpoint file if I already have one.

I also want the optional rendering path working so, if I have a CUDA GPU, I can turn those predicted gaussians into a rendered camera move video. For prediction, it should still work on CPU, CUDA, or Apple silicon if supported. Please include a quick sanity check with sample input and clear usage help so I know what folders to pass in and where outputs will land. If anything is unclear, look up the current docs online and follow the repo README.