fix: harden headless classic package smoke

scripts/Invoke-HyperTwistClassicCubePackage.ps1

@@ -10,6 +10,7 @@ param(
         '-DisablePlugins=MovieRenderPipeline',
         '-SkipCookingEditorContent'
     ),
+    [bool]$HeadlessSmoke = $true,
     [string]$ValidationReportPath = '',
     [switch]$CleanArchive,
     [switch]$SkipBuild,
@@ -318,6 +319,7 @@ $ValidationReport = [ordered]@{
     cookMaps = @($CookMaps)
     smokeMaps = @($ResolvedSmokeMaps)
     additionalCookerOptions = @($ResolvedAdditionalCookerOptions)
+    headlessSmoke = $HeadlessSmoke
     cleanArchive = [bool]$CleanArchive
     skipBuild = [bool]$SkipBuild
     skipLaunch = [bool]$SkipLaunch
@@ -358,7 +360,12 @@ try
                 '{0}.json' -f (Convert-PathToken -Value $SmokeMap)
             )
             Write-Host "Smoke validating packaged classic-cube map '$SmokeMap'..."
-            & $LaunchScriptPath -PackageRoot $ArchiveDirectory -MapUrl $SmokeMap -ReportPath $SmokeReportPath
+            & $LaunchScriptPath `
+                -PackageRoot $ArchiveDirectory `
+                -MapUrl $SmokeMap `
+                -ReportPath $SmokeReportPath `
+                -UseNullRHI:$HeadlessSmoke `
+                -NoSound:$HeadlessSmoke
             if ($LASTEXITCODE -ne 0)
             {
                 throw "Packaged classic-cube smoke launch failed for '$SmokeMap' with exit code $LASTEXITCODE."