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.

packaging/windows/OptiScaler.ini

@@ -0,0 +1,27 @@
+; OptiScaler settings for the d4r Windows drag-in release. Values not listed keep OptiScaler's
+; defaults. The DLSS model is chosen in d4r\d4r.ini, not here.
+[Upscalers]
+Dx12Upscaler=dlss
+[FrameGen]
+Enabled=false
+FGInput=nofg
+FGOutput=nofg
+[DLSS]
+Enabled=true
+AllowExternalBackend=true
+RenderPresetOverride=false
+UseGenericAppIdWithDlss=false
+[Libraries]
+; Relative to this folder (needs d4r's OptiScaler with patch 0006).
+NvngxPath=d4r
+NvngxDlssPath=d4r\dlss
+NvngxFeaturePath=d4r\dlss
+[Hotfix]
+RestoreComputeSignature=false
+RestoreGraphicSignature=false
+ExtendedStateRestore=false
+[Log]
+LogToFile=true
+LogLevel=2
+[Menu]
+DisableSplash=true