DS4Server/native/metal/README.md

Vendored DS4 Metal boundary

The Metal bridge and GPU declarations track the DS4 boundary audited at commit ec7642cdd9ec81d01ad4b1fd8f8a3d1511533748 (2026-08-31):

• ds4_metal.m
• ds4_gpu.h

The matching Metal kernels, including glm53_*.metal, live in the repository-level metal/ directory. The other headers remain DS4Server-owned interfaces and are not copies of DS4 application code. DS4Server builds and bundles this local snapshot; it does not read a sibling DS4 checkout. Rust owns the model, graph, session, sampling, and lifecycle. Objective-C remains only at the platform Metal boundary.

The Vision Experimental primitives added for issue #100 were reviewed against DS4 0aaea5a238fb41a35106a551e73c8409dfb751ac. The new Metal file and visual routing kernel follow that reference; image preprocessing, encoder graph, visual prompt masks and session identities remain in Rust. See docs/issue100-vision/README.md for the source and validation receipts.