fix(shopfloor): clear imaging AutoLogonCount at ShopFloor handover

Run-ShopfloorSetup and Stage-Dispatcher top AutoLogonCount up to 10 so
SupportUser survives vendor-forced reboots. Sysinternals Autologon, which
lockdown uses to switch the bay to ShopFloor, leaves the counter in place,
so ShopFloor inherited the remainder. Windows counts it down on every
autologon and at 0 sets AutoAdminLogon=0: the bay boots to a ShopFloor
password prompt a few reboots after imaging.

Delete the counter once Winlogon shows ShopFloor:
- Monitor-IntuneProgress.ps1, on the poll that sees the handover
- SetShopfloorAutoLogon.bat, after sfld_autologon.ps1
- Force-Lockdown.bat, on success

The SupportUser top-ups stay. Tested in the win11 VM: the Monitor block
removes the counter for ShopFloor, keeps it for SupportUser, and is a
no-op when clean; both batch files leave ShopFloor autologon on with no
counter.

playbook/shopfloor-setup/Shopfloor/Force-Lockdown.bat

@@ -70,6 +70,10 @@ if "%RC%"=="0" (
     if not exist "C:\Enrollment" mkdir "C:\Enrollment"
     > "C:\Enrollment\force-lockdown-applied.txt" echo %DATE% %TIME%
     echo Marker written: C:\Enrollment\force-lockdown-applied.txt
+    REM Clear the imaging AutoLogonCount: Autologon leaves it in place and
+    REM ShopFloor autologon switches itself off when it counts down to 0.
+    reg delete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v AutoLogonCount /f /reg:64 >nul 2>&1
+    echo Cleared leftover AutoLogonCount.
 )
 
 echo.