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/install.bat

@@ -0,0 +1,10 @@
+@echo off
+setlocal
+echo d4r will download NVIDIA DLSS files and an NVIDIA driver archive.
+echo Driver archive is about 945 MiB (991 MB). It will only extract _nvngx.dll; it will not install or change drivers.
+choice /C YN /N /M "Continue? [Y/N] "
+if errorlevel 2 exit /b 0
+powershell.exe -NoProfile -ExecutionPolicy Bypass -File "%~dp0install-dlss.ps1" -PackageRoot "%~dp0." -Yes
+set "D4R_INSTALL_EXIT=%ERRORLEVEL%"
+if not "%D4R_INSTALL_EXIT%"=="0" echo d4r install failed. Read the message above.
+exit /b %D4R_INSTALL_EXIT%