feat: add d4r inference engines and Windows parity tooling

Add native K/M/RR inference engines, HIP kernels, replay and validation
harnesses, and Windows DLSS setup and runtime support. Include GPU
profiling tools, build and packaging scripts, platform integration
patches, and implementation documentation.

WINDOWS_M11.md

@@ -0,0 +1,3 @@
+# Windows M11 workspace
+
+See [M11 directory map and status](docs/windows-m11.md), or open the [historical M11 Windows workspace](windows/m11/README.md). The Windows M11 workspace is not merged into the mainline Windows port.