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/windows/ngx_public_abi.h

@@ -0,0 +1,25 @@
+#pragma once
+#include <cstdint>
+#include <string>
+
+// Public NGX driver export ABI, also used by the upstream shim and OptiScaler.
+// NVIDIA SDK headers or binaries are not build dependencies.
+namespace d4r::ngx {
+struct PathListInfo { const wchar_t* const* Path; unsigned Length; };
+struct LoggingInfo { void* LoggingCallback; int MinimumLoggingLevel; bool DisableOtherLoggingSinks; };
+struct FeatureCommonInfo { PathListInfo PathListInfo; void* InternalData; LoggingInfo LoggingInfo; };
+struct ProjectDescription { const char* ProjectId; int EngineType; const char* EngineVersion; };
+struct ApplicationIdentifier {
+    unsigned IdentifierType;
+    union Value { ProjectDescription ProjectDesc; unsigned long long ApplicationId; } v;
+};
+struct FeatureDiscoveryInfo {
+    unsigned SDKVersion, FeatureID;
+    ApplicationIdentifier Identifier;
+    const wchar_t* ApplicationDataPath;
+    const FeatureCommonInfo* FeatureInfo;
+};
+struct FeatureRequirement { unsigned FeatureSupported, MinHWArchitecture; char MinOSVersion[255]; };
+struct ProjectIdentity { std::string id; int engine; std::string version; };
+static_assert(sizeof(FeatureCommonInfo) == 40 && sizeof(FeatureDiscoveryInfo) == 56 && sizeof(FeatureRequirement) == 264);
+}