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/check-zluda-patches.ps1

@@ -0,0 +1,25 @@
+[CmdletBinding()]
+param([string]$SourceRoot)
+$ErrorActionPreference = 'Stop'
+$repo = [IO.Path]::GetFullPath((Join-Path $PSScriptRoot '../..'))
+if (!$SourceRoot) { $SourceRoot = Join-Path $repo 'external/ZLUDA' }
+$base = 'ee2f25a180099fa42f36b2346732e1f2470a03ad'
+$relative = 'build/zluda-patch-check-' + [Guid]::NewGuid().ToString('N')
+$snapshot = Join-Path $repo $relative
+New-Item -ItemType Directory -Force $snapshot | Out-Null
+$archive = "$snapshot.tar"
+& git -C $SourceRoot archive --format=tar "--output=$archive" $base
+if ($LASTEXITCODE) { throw 'Could not archive the pinned ZLUDA base.' }
+& tar.exe -xf $archive -C $snapshot
+if ($LASTEXITCODE) { throw 'Could not extract the ZLUDA patch-check snapshot.' }
+Push-Location $repo
+try {
+    foreach ($patch in (Get-ChildItem -LiteralPath (Join-Path $repo 'patches/zluda') -Filter '*.patch' | Sort-Object Name)) {
+        & git apply "--directory=$relative" --check $patch.FullName
+        if ($LASTEXITCODE) { throw "Fresh-source patch check failed: $($patch.Name)" }
+        & git apply "--directory=$relative" --whitespace=nowarn $patch.FullName
+        if ($LASTEXITCODE) { throw "Fresh-source patch apply failed: $($patch.Name)" }
+        Write-Host "PASS patch $($patch.Name)"
+    }
+    Write-Host "Pinned-source patch snapshot: $snapshot"
+} finally { Pop-Location }