fix(windows): fix CI function name and purge return type handling

- Fix Test-IsProtectedPath -> Test-ProtectedPath in CI workflow
- Fix purge.ps1 to handle boolean return from Remove-SafeItem
- Add C:\Program Files and C:\Program Files (x86) to ProtectedPaths

.github/workflows/windows.yml

@@ -188,7 +188,7 @@ jobs:
           )
           
           foreach ($path in $protectedPaths) {
-              if (-not (Test-IsProtectedPath -Path $path)) {
+              if (-not (Test-ProtectedPath -Path $path)) {
                   Write-Host "✗ $path should be protected!" -ForegroundColor Red
                   exit 1
               }

windows/bin/purge.ps1

@@ -473,15 +473,15 @@ function Remove-ProjectArtifacts {
         
         foreach ($artifact in $project.Artifacts) {
             if (Test-Path $artifact.Path) {
-                # Use safe removal with protection checks
-                $result = Remove-SafeItem -Path $artifact.Path -Description $artifact.Name -Recurse
+                # Use safe removal with protection checks (returns boolean)
+                $success = Remove-SafeItem -Path $artifact.Path -Description $artifact.Name -Recurse
                 
-                if ($result.Removed -gt 0) {
+                if ($success) {
                     Write-Host "  $esc[32m$($script:Icons.Success)$esc[0m $($artifact.Name) ($($artifact.SizeHuman))"
                     $script:TotalSizeCleaned += $artifact.SizeKB
                     $script:ItemsCleaned++
                 }
-                elseif ($result.Failed -gt 0) {
+                else {
                     Write-Host "  $esc[31m$($script:Icons.Error)$esc[0m $($artifact.Name) - removal failed"
                 }
             }

windows/lib/core/base.ps1

@@ -87,6 +87,8 @@ $script:ProtectedPaths = @(
     "C:\Windows"
     "C:\Windows\System32"
     "C:\Windows\SysWOW64"
+    "C:\Program Files"
+    "C:\Program Files (x86)"
     "C:\Program Files\Windows Defender"
     "C:\Program Files (x86)\Windows Defender"
     "C:\ProgramData\Microsoft\Windows Defender"