Fix native collector subscription inventory and Unicode readback

scripts/WefDeployment.ps1

@@ -30,13 +30,14 @@ function Get-WelaWefControlState {
         'SubscriptionManager' { return Get-WelaRegistryState -Path $Target.Path -Name $Target.Name }
         'ForwardedEvents' { return Get-WelaNativeChannel -Name 'ForwardedEvents' }
         'Subscription' {
-            $ids = @((Invoke-WelaNative -FilePath 'wecutil.exe' -Arguments @('es')).Output | ForEach-Object { $_.ToString().Trim() } | Where-Object { $_ })
+            $ids = @(Get-WelaWecSubscriptionIds)
             if ($ids -notcontains $Target.Id) { return [pscustomobject]@{ Exists=$false; Xml=$null; Key=$null; Definition=$null } }
             # Keep evidence as a plain string. Windows PowerShell 5.1's JSON
             # serializer expands ETS properties on strings (for example a test
             # reader's PSDrive/PSProvider graph), unlike modern PowerShell.
-            $xml = [string]::Concat((Invoke-WelaNative -FilePath 'wecutil.exe' -Arguments @('gs',$Target.Id,'/f:xml')).Diagnostic)
+            $xml = [string]::Concat((Read-WelaWecSubscriptionXml -Id $Target.Id))
             $model = ConvertFrom-WelaWefSubscription -Xml $xml -SourceSids $Target.SourceSids -Observed
+            if($model.Id -cne $Target.Id){throw 'Native subscription identity differs from the selected ID.'}
             return [pscustomobject]@{ Exists=$true; Xml=$xml; Key=$model.Key; Definition=$model.Definition }
         }
         default { throw "Unsupported WEF control kind: $Kind" }