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/d4r_win32_wait.h

@@ -0,0 +1,23 @@
+#pragma once
+#include <windows.h>
+#include <cstdint>
+
+// MinGW's Win32 std::sleep_for can truncate submillisecond durations to zero.
+// NtDelayExecution retains 100 ns precision and actually sleeps under Wine.
+inline void d4r_sleep_us(unsigned int microseconds)
+{
+    using Delay = LONG(WINAPI*)(BOOLEAN, LARGE_INTEGER*);
+    static const auto delay = reinterpret_cast<Delay>(reinterpret_cast<void*>(
+        GetProcAddress(GetModuleHandleW(L"ntdll.dll"), "NtDelayExecution")));
+    if (microseconds == 0)
+    {
+        SwitchToThread();
+        return;
+    }
+    LARGE_INTEGER interval;
+    interval.QuadPart = -static_cast<LONGLONG>(microseconds) * 10;
+    if (delay != nullptr && delay(FALSE, &interval) >= 0)
+        return;
+    // A rounded-up millisecond wait still releases the CPU if ntdll is absent.
+    Sleep(static_cast<DWORD>((static_cast<uint64_t>(microseconds) + 999) / 1000));
+}