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.

tools/ngx_load_probe.cpp

@@ -0,0 +1,60 @@
+#include <windows.h>
+
+#include <cstdio>
+#include <cstdlib>
+
+int main(int argc, char** argv)
+{
+    if (argc != 2)
+    {
+        std::fprintf(stderr, "usage: ngx_load_probe.exe PATH_TO_NVNGX_DLSS_DLL\n");
+        return 2;
+    }
+
+    SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX);
+
+    const char* path = argv[1];
+    HMODULE module = LoadLibraryA(path);
+    if (module == nullptr)
+    {
+        std::fprintf(stderr, "LoadLibraryA failed for '%s': GetLastError=%lu\n", path, GetLastError());
+        return 1;
+    }
+
+    std::printf("LoadLibraryA succeeded: %s\n", path);
+
+    constexpr const char* symbols[] = {
+        "NVSDK_NGX_GetAPIVersion",
+        "NVSDK_NGX_D3D12_GetFeatureRequirements",
+        "NVSDK_NGX_D3D12_Init",
+        "NVSDK_NGX_D3D12_CreateFeature",
+        "NVSDK_NGX_D3D12_EvaluateFeature",
+        "NVSDK_NGX_VULKAN_GetFeatureRequirements",
+        "NVSDK_NGX_VULKAN_Init",
+        "NVSDK_NGX_VULKAN_CreateFeature",
+        "NVSDK_NGX_VULKAN_EvaluateFeature",
+        "NVSDK_NGX_CUDA_GetFeatureRequirements",
+        "NVSDK_NGX_CUDA_Init",
+        "NVSDK_NGX_CUDA_CreateFeature",
+        "NVSDK_NGX_CUDA_EvaluateFeature",
+    };
+
+    for (const char* symbol : symbols)
+    {
+        std::printf("export %-52s %s\n", symbol, GetProcAddress(module, symbol) ? "present" : "absent");
+    }
+
+    FARPROC getApiVersion = GetProcAddress(module, "NVSDK_NGX_GetAPIVersion");
+    if (getApiVersion == nullptr)
+    {
+        std::fprintf(stderr, "NVSDK_NGX_GetAPIVersion export is unavailable\n");
+        FreeLibrary(module);
+        return 1;
+    }
+
+    const unsigned int apiVersion = static_cast<unsigned int>(getApiVersion());
+    std::printf("NVSDK_NGX_GetAPIVersion returned 0x%08x\n", apiVersion);
+
+    FreeLibrary(module);
+    return 0;
+}