UDC: correct CLI arg signature to compact site + dash-prefixed machine#

UDC_Setup.exe and UDC.exe expect:
  UDC_Setup.exe WestJefferson -7605

Not the spaced-quoted positional pair we'd been passing:
  UDC_Setup.exe "West Jefferson" 7605

The wrong format meant UDC ignored both args, fell back to defaults
(Site=Evendale, MachineNumber=blank). Combined with the kill-after-detect
window, neither value got persisted to udc_settings.json regardless of
whether UDC.exe was given time to write.

Changes:
- preinstall.json: UDC InstallArgs now "WestJefferson -9999"
- 00-PreInstall-MachineApps.ps1: site override now matches/replaces
  the compact 'WestJefferson' token (not 'West Jefferson') and uses
  siteNameCompact from site-config; targetNum extraction regex updated
  to '-(\d+)$' for the new dash-prefix format
- Update-MachineNumber.ps1: UDC.exe relaunch now passes positional
  compact-site + dash-prefixed number instead of -site/-machine flags

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

playbook/shopfloor-setup/Shopfloor/lib/Update-MachineNumber.ps1

@@ -129,7 +129,10 @@ function Update-MachineNumber {
     # --- Relaunch UDC with new args ---
     if ((Test-Path $script:UdcExePath) -and $out.UdcUpdated) {
         try {
-            Start-Process -FilePath $script:UdcExePath -ArgumentList @('-site', "`"$Site`"", '-machine', $NewNumber)
+            # UDC.exe arg signature: positional compact-site (no space), then
+            # dash-prefixed machine number. Example: UDC.exe WestJefferson -7605
+            $siteCompact = ($Site -replace '\s+','')
+            Start-Process -FilePath $script:UdcExePath -ArgumentList @($siteCompact, "-$NewNumber")
         } catch {
             $out.Errors += "UDC relaunch failed: $_"
         }