Shell defaults + eDNC reg restore from machine-number backups

- 03-ShellDefaults.ps1: Default-User TaskbarAl=0 (left), HKLM policies to
  hide Start Recommended section, kill Bing web search + suggestions,
  disable Cortana. LTSC-honoured; runs fleet-wide via baseline loop.

- ntlars-backups/: 147 per-machine eDNC registry backups renamed to
  flat <MachineNumber>.reg scheme. Historical off-by-one entries from
  the original dump rewritten to match CSV-target MachineNo.

- Standard/03-RestoreEDncConfig.ps1: at imaging time, if tech typed a
  real machine number at PXE (not 9999), import <num>.reg from the local
  staged copy. Restores eFocas IP, PPDCS serial, Hssb relays -- not just
  the bare MachineNo. Skipped on Timeclock / 9999 / missing backup.

- Update-MachineNumber.ps1: when tech later sets a real number from 9999,
  pull <num>.reg from tsgwp00525 SFLD share (ntlarsBackupSharePath in
  site-config) and reg-import it before writing the new MachineNo.

- Restore-EDncReg.ps1: shared helper (Mount-SFLDShare + Import-EDncRegBackup)
  used by both callers.

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

playbook/shopfloor-setup/site-config.json

@@ -79,6 +79,7 @@
 
     "Standard-Machine": {
       "machineappsSharePath": "\\\\tsgwp00525.wjs.geaerospace.net\\shared\\dt\\shopfloor\\main\\machineapps",
+      "ntlarsBackupSharePath": "\\\\tsgwp00525.wjs.geaerospace.net\\shared\\dt\\shopfloor\\main\\ntlars-backups",
       "startupItems": [
         { "label": "WJ Shopfloor",  "type": "existing",  "sourceLnk": "WJ Shopfloor.lnk" },
         { "label": "Plant Apps",    "type": "url",       "urlKey": "plantApps" },