Auto-apply startup items from profile, Configure-PC -MachineNumberOnly

Three changes to eliminate the redundant startup-item picker during
the imaging chain:

06-OrganizeDesktop.ps1 - new Phase 3: auto-apply startup items
  Reads pcProfile.startupItems (or site-wide default) and creates
  .lnk files in AllUsers Startup folder. Supports exe, existing, and
  url types (same as Configure-PC). Idempotent - skips items that
  already exist so manual changes aren't overwritten. Runs during
  shopfloor setup finalization, so the tech doesn't need to select
  startup items again.

Configure-PC.ps1 - new -MachineNumberOnly switch
  When set, skips the entire startup-items section and only shows the
  machine number prompt (if UDC/eDNC at 9999). Used by sync_intune
  -AsTask after completion. Full startup picker still available when
  the tech opens Configure-PC.bat manually from the desktop.

Monitor-IntuneProgress.ps1 - simplified -AsTask completion
  After post-reboot DSC complete: unregisters task, launches
  Configure-PC -MachineNumberOnly, exits. Tech uses sync_intune.bat
  on the desktop to see QR code for inventory purposes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

playbook/shopfloor-setup/Shopfloor/Configure-PC.ps1

@@ -15,6 +15,13 @@
 #
 # Run via Configure-PC.bat on the SupportUser desktop.
 
+param(
+    # When set, only show the machine number section (skip startup items).
+    # Used by sync_intune -AsTask after completion -- startup items are
+    # already auto-applied by 06-OrganizeDesktop from the PC profile.
+    [switch]$MachineNumberOnly
+)
+
 $ErrorActionPreference = 'Continue'
 
 # --- Transcript logging ---
@@ -307,6 +314,9 @@ if ($needsMachineNumber) {
 }
 
 # --- Section 2: Startup items + machine-number logon task ---
+# Skipped when -MachineNumberOnly (called from sync_intune -AsTask after
+# completion -- startup items already auto-applied by 06-OrganizeDesktop).
+if (-not $MachineNumberOnly) {
 Write-Host ""
 Write-Host "  AUTO-STARTUP ITEMS" -ForegroundColor Yellow
 Write-Host "  ----------------------------------------"
@@ -423,6 +433,8 @@ if ($selection) {
     Write-Host "    No changes." -ForegroundColor DarkGray
 }
 
+} # end if (-not $MachineNumberOnly)
+
 # --- Summary ---
 Write-Host ""
 Write-Host "  CURRENT STATE" -ForegroundColor Cyan