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.

scripts/windows/capture-game-window.ps1

@@ -0,0 +1,58 @@
+[CmdletBinding()]
+param([Parameter(Mandatory=$true)][int]$GameProcessId, [Parameter(Mandatory=$true)][string]$OutputPath)
+$ErrorActionPreference = 'Stop'
+Add-Type -AssemblyName System.Drawing
+if (!('D4RWindowCapture' -as [type])) {
+    Add-Type @'
+using System;
+using System.Runtime.InteropServices;
+using System.Text;
+public static class D4RWindowCapture {
+    public delegate bool Callback(IntPtr window, IntPtr data);
+    [StructLayout(LayoutKind.Sequential)] public struct Rect { public int Left, Top, Right, Bottom; }
+    [DllImport("user32.dll")] public static extern bool EnumWindows(Callback callback, IntPtr data);
+    [DllImport("user32.dll")] public static extern uint GetWindowThreadProcessId(IntPtr window, out uint process);
+    [DllImport("user32.dll")] public static extern bool GetWindowRect(IntPtr window, out Rect rect);
+    [DllImport("user32.dll",CharSet=CharSet.Unicode)] public static extern int GetWindowText(IntPtr window, StringBuilder text, int count);
+    [DllImport("user32.dll")] public static extern bool IsWindowVisible(IntPtr window);
+    [DllImport("user32.dll")] public static extern IntPtr GetForegroundWindow();
+    [DllImport("user32.dll")] public static extern IntPtr SetThreadDpiAwarenessContext(IntPtr context);
+}
+'@
+}
+$windows = [Collections.Generic.List[object]]::new()
+$previousDpi=[D4RWindowCapture]::SetThreadDpiAwarenessContext([IntPtr](-4))
+try {
+$callback = [D4RWindowCapture+Callback]{ param($window,$data)
+    [uint32]$owner = 0
+    [void][D4RWindowCapture]::GetWindowThreadProcessId($window,[ref]$owner)
+    if ($owner -eq $GameProcessId) {
+        $rect = [D4RWindowCapture+Rect]::new()
+        [void][D4RWindowCapture]::GetWindowRect($window,[ref]$rect)
+        $title = [Text.StringBuilder]::new(512)
+        [void][D4RWindowCapture]::GetWindowText($window,$title,512)
+        $windows.Add([pscustomobject]@{handle=$window; title=$title.ToString(); visible=[D4RWindowCapture]::IsWindowVisible($window); rect=$rect;
+            area=($rect.Right-$rect.Left)*($rect.Bottom-$rect.Top)})
+    }
+    return $true
+}
+[void][D4RWindowCapture]::EnumWindows($callback,[IntPtr]::Zero)
+$windows | Select-Object handle,title,visible,area | Format-Table
+$chosen = $windows | Where-Object { $_.visible -and $_.area -gt 4096 } | Sort-Object area -Descending | Select-Object -First 1
+if (!$chosen) { throw "No visible game window for PID $GameProcessId" }
+if ([D4RWindowCapture]::GetForegroundWindow() -ne $chosen.handle) {
+    throw 'Game window is not foreground; capture refused to avoid including unrelated overlapping windows.'
+}
+$rect = $chosen.rect
+$bitmap = [Drawing.Bitmap]::new($rect.Right-$rect.Left,$rect.Bottom-$rect.Top)
+$graphics = [Drawing.Graphics]::FromImage($bitmap)
+try {
+    $graphics.CopyFromScreen($rect.Left,$rect.Top,0,0,$bitmap.Size)
+    $bitmap.Save([IO.Path]::GetFullPath($OutputPath),[Drawing.Imaging.ImageFormat]::Png)
+} finally {
+    $graphics.Dispose(); $bitmap.Dispose()
+}
+Write-Host "Captured game window: $OutputPath"
+} finally {
+    if ($previousDpi -ne [IntPtr]::Zero) { [void][D4RWindowCapture]::SetThreadDpiAwarenessContext($previousDpi) }
+}