Unify Windows client bootstrap and discover network paths

scripts/Enroll-SguDomainClient.ps1

@@ -22,6 +22,7 @@ param(
     [string]$NewComputerName,
     [string]$NetworkInterfaceAlias = 'Ethernet',
     [string[]]$DomainDnsServerAddresses = @('192.168.50.10'),
+    [switch]$DomainDnsConfigured,
     [ValidateSet('Direct', 'AzureP2S')]
     [string]$ConnectivityMode = 'Direct',
     [string]$RemoteDesktopPrincipal = 'LCI\SG-Laboratorio-Usuarios-RDP',
@@ -93,7 +94,10 @@ if ($PSCmdlet.ShouldProcess($env:COMPUTERNAME, 'Install and verify SGU before jo
     # The broker uses a domain DNS name even before the machine joins the
     # domain. Point at AD DNS first so the provider-first health check works on
     # a completely clean Windows installation.
-    if ($ConnectivityMode -eq 'Direct') {
+    if ($DomainDnsConfigured) {
+        # The bootstrap configured domain-scoped NRPT, preserving Internet DNS.
+    }
+    elseif ($ConnectivityMode -eq 'Direct') {
         Set-DnsClientServerAddress `
             -InterfaceAlias $NetworkInterfaceAlias `
             -ServerAddresses $DomainDnsServerAddresses
@@ -144,6 +148,9 @@ if ($PSCmdlet.ShouldProcess($env:COMPUTERNAME, 'Install and verify SGU before jo
             $postJoinParameters.RustDeskServerAddress = $RustDeskServerAddress
         }
         $postJoin = & (Join-Path $PSScriptRoot 'Test-SguClientEnrollment.ps1') @postJoinParameters
+        if (-not $postJoin.IsValid) {
+            throw "SGU validation failed on the joined computer: $($postJoin.Issues -join ' ')"
+        }
         $postJoin | Add-Member -NotePropertyName StandardLocalUser -NotePropertyValue $localStudentUser
         $postJoin | Add-Member -NotePropertyName RustDesk -NotePropertyValue $rustDeskResult
         return $postJoin