migrate-to-wifi: restore wired-disable behavior

Reverts the 2026-04-24 no-op stub. Empirically the gateway-suppression
fix (dnsmasq dhcp-option=3/=6 empty) alone is NOT sufficient to keep
Windows from using the wired NIC for Intune Device Configuration / DSC
traffic. Even with no default route on wired AND the unattend's
InterfaceMetric trick (WiFi=10, Wired=100), the bay stalls on the DSC
phase until the wired cable is physically unplugged.

Restoring the prior body that disables non-WiFi NICs at first logon
post-PPKG. Gated on Get-NetAdapter for a Wi-Fi/Wireless/WLAN/802.11
adapter - towers without WiFi stay on ethernet (the only-NIC scenario
where disabling would hang first logon). Falls back to re-enabling
ethernet if login.microsoftonline.us:443 doesn't respond within 5 min.

Monitor-IntuneProgress.ps1 already has the symmetric re-enable
("Re-enable any wired NICs that Order 5 disabled") at the start of its
monitor loop, which kicks in after DSC creds land. Net effect: wired
disabled during the DSC fetch window, re-enabled by the time eDNC
autostart needs the local NIC.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

playbook/migrate-to-wifi.ps1

@@ -1,30 +1,43 @@
-# migrate-to-wifi.ps1 - No-op as of 2026-04-24.
+# migrate-to-wifi.ps1 - Invoked by FlatUnattendW10-shopfloor.xml as Order 5
+# during first logon, right after wait-for-internet.ps1 and right before
+# GCCH enrollment. Moves the machine off wired onto WiFi for the rest of
+# the imaging chain so the PXE ethernet cable can be safely disconnected.
 #
-# Previously this disabled all wired NICs at first logon to keep PPKG /
+# Gated: if there is no physical Wi-Fi adapter on the machine (tower /
-# Intune enrollment routing internet traffic via WiFi. The wired NIC was
+# desktop case), the whole migration is a no-op. Previously this step
-# preferred by Windows because the PXE dnsmasq was handing out a default
+# disabled all wired adapters unconditionally and then waited for WiFi
-# gateway (dhcp-option=3,10.9.100.1) which Windows installed as a default
+# internet that could never arrive on towers, hanging first logon forever.
-# route, and the lower interface metric of wired beat WiFi. Internet-bound
-# traffic then black-holed at 10.9.100.1 (the PXE server, which doesn't
-# forward).
-#
-# That root cause was fixed by removing the dhcp-option=3 and =6 lines
-# from /etc/dnsmasq.conf on the PXE server. Without an advertised gateway
-# on the PXE side, Windows can't add a default route via wired, so all
-# internet traffic uses WiFi by default and the wired NIC stays harmless
-# for same-subnet PXE/SMB traffic to 10.9.100.1.
-#
-# Side effect of the original behavior was an eDNC race: eDNC autostart
-# would fire while the wired NIC was still disabled and hit WSAEINVAL
-# (Winsock 10022) trying to bind to a non-existent local IP, looping its
-# retry timer until a SYSTEM task re-enabled the NIC after SFLD creds
-# landed (often ~30+ min later). Keeping the NIC up the whole time
-# eliminates that race.
-#
-# Kept as a no-op file (instead of removed) so the unattend XML's Order 5
-# RunSynchronousCommand entry does not need to be re-numbered. If the
-# dhcp-option lines ever come back, this can be reverted to the disable
-# logic by restoring from git.
 
-Write-Host 'migrate-to-wifi.ps1: no-op (wired NIC kept enabled).'
+$wifi = Get-NetAdapter -Physical -ErrorAction SilentlyContinue |
+        Where-Object { $_.InterfaceDescription -match 'Wi-?Fi|Wireless|WLAN|802\.11' }
+
+if (-not $wifi) {
+    Write-Host 'No WiFi adapter - staying on ethernet.' -ForegroundColor Cyan
+    exit 0
+}
+
+Get-NetAdapter -Physical |
+    Where-Object { $_.InterfaceDescription -notmatch 'Wi-?Fi|Wireless|WLAN|802\.11' } |
+    Disable-NetAdapter -Confirm:$false
+
+$deadline = (Get-Date).AddMinutes(5)
+$ok = $false
+while ((Get-Date) -lt $deadline) {
+    try {
+        if (Test-NetConnection -ComputerName login.microsoftonline.us -Port 443 -InformationLevel Quiet -WarningAction SilentlyContinue) {
+            $ok = $true
+            break
+        }
+    } catch {}
+    Start-Sleep -Seconds 5
+}
+
+if ($ok) {
+    Write-Host 'Internet confirmed over WiFi.' -ForegroundColor Green
+} else {
+    Write-Host 'WiFi internet timeout - re-enabling ethernet.' -ForegroundColor Yellow
+    Get-NetAdapter -Physical |
+        Where-Object { $_.InterfaceDescription -notmatch 'Wi-?Fi|Wireless|WLAN|802\.11' } |
+        Enable-NetAdapter -Confirm:$false
+}
 exit 0