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/gpu_inventory.cpp

@@ -0,0 +1,57 @@
+#include "hip_api.h"
+#include <fstream>
+#include <sstream>
+#include <iomanip>
+
+static std::string json_string(const std::string& value) {
+    std::ostringstream out; out << '"';
+    for (unsigned char c : value) {
+        if (c == '"' || c == '\\') out << '\\' << char(c);
+        else if (c < 32) out << "\\u" << std::hex << std::setw(4) << std::setfill('0') << unsigned(c);
+        else out << char(c);
+    }
+    out << '"'; return out.str();
+}
+int main(int argc, char** argv) {
+    using namespace d4r::diag;
+    start();
+    try {
+        Args args(argc, argv);
+        if (args.output_dir.empty()) throw std::runtime_error("--output-dir is required");
+        for (const char* name : {"HSA_OVERRIDE_GFX_VERSION", "HSA_OVERRIDE_GFX_VERSION_0"})
+            if (std::getenv(name)) throw std::runtime_error(std::string("Unset architecture override ") + name);
+        HipApi hip(args.hip_root);
+        hip.check(hip.hipInit(0), "hipInit(inventory)");
+        int count=0, version=0, driver=0;
+        hip.check(hip.hipRuntimeGetVersion(&version), "hipRuntimeGetVersion");
+        hip.check(hip.hipDriverGetVersion(&driver), "hipDriverGetVersion");
+        std::printf("GPU_INVENTORY_RUNTIME runtime=%d driver_api=%d headers=%d.%d.%d sizeof(properties)=%zu\n",
+                    version,driver,HIP_VERSION_MAJOR,HIP_VERSION_MINOR,HIP_VERSION_PATCH,sizeof(hipDeviceProp_t));
+        hip.check(hip.hipGetDeviceCount(&count), "hipGetDeviceCount");
+        std::ostringstream json;
+        json << "{\"schema\":1,\"runtimeVersion\":" << version << ",\"driverApiVersion\":" << driver << ",\"compiledTarget\":"
+             << json_string(D4R_TARGET_ARCH) << ",\"gpuWorkExecuted\":false,\"devices\":[";
+        for (int i=0; i<count; ++i) {
+            hipDeviceProp_t p{}; hip.check(hip.hipGetDeviceProperties(&p,i), "hipGetDevicePropertiesR0600");
+            const auto arch=gpu_architecture(p.gcnArchName);
+            std::printf("GPU_INVENTORY ordinal=%d name=%s gcnArchName=%s wave=%d build_eligible=%d\n",
+                        i,p.name,p.gcnArchName,p.warpSize,supported_gpu_target(arch));
+            if (i) json << ',';
+            json << "{\"ordinal\":" << i << ",\"name\":" << json_string(p.name)
+                 << ",\"gcnArchName\":" << json_string(p.gcnArchName) << ",\"architecture\":" << json_string(arch)
+                 << ",\"wavefrontSize\":" << p.warpSize << ",\"vramBytes\":" << p.totalGlobalMem
+                 << ",\"buildEligible\":" << (supported_gpu_target(arch) ? "true" : "false") << '}';
+        }
+        json << "]}\n";
+        std::filesystem::create_directories(wide(args.output_dir));
+        std::ofstream file(std::filesystem::path(wide(args.output_dir))/L"gpu-inventory.json",std::ios::binary);
+        file << json.str(); file.close();
+        if (!file) throw std::runtime_error("Cannot write GPU inventory");
+        if (!count) throw std::runtime_error("HIP reports no devices");
+        loaded_modules();
+        std::printf("PASS GPU_INVENTORY devices=%d gpu_work_executed=0\n",count);
+        return 0;
+    } catch (const std::exception& error) {
+        std::fprintf(stderr,"FAIL GPU_INVENTORY %s\n",error.what()); loaded_modules(); return 4;
+    }
+}