Add private WGP output validation and record measured K experiments

scripts/windows/build-native-texture.ps1

@@ -4,6 +4,7 @@ param(
     [string]$Kernel = 'hiluma_engine_output_depthinv_mvlo_hdr_max_v2_rel',
     [string]$HipRoot = 'C:\Program Files\AMD\ROCm\7.2',
     [string]$ZludaRoot,
+    [ValidateSet('cu','wgp')][string]$ShaderMode='cu',
     [string]$OutputDirectory
 )
 $ErrorActionPreference='Stop'
@@ -11,5 +12,5 @@ $repo=[IO.Path]::GetFullPath((Join-Path $PSScriptRoot '../..'))
 if (!$ZludaRoot) { $ZludaRoot=Join-Path $repo 'dist/zluda-windows-final' }
 if (!$OutputDirectory) { $OutputDirectory=Join-Path $repo 'build/private-textures-gfx1201' }
 & python (Join-Path $repo 'tools/windows/build_native_texture.py') --dlss-dll $DlssDll --hip-root $HipRoot `
-    --zluda-root $ZludaRoot --kernel $Kernel --output-directory $OutputDirectory
+    --zluda-root $ZludaRoot --kernel $Kernel --output-directory $OutputDirectory --shader-mode $ShaderMode
 if ($LASTEXITCODE) { throw "Native texture build failed ($LASTEXITCODE); inspect the output work directory." }