Renumber PXE LAN from 10.9.100.0/24 to 172.16.9.0/24

Single-site bay-stuck issue at WJ: GE Intune Report IP script filters
Get-NetIPAddress on StartsWith("10.") and posts everything matching
to the GE Tines webhook. Bays at WJ get the PXE LAN 10.9.100.x IP
captured and reported -> GE backend tags bays as on a non-corp 10.x
subnet -> dynamic group eligibility for SFLD policy never matches.
Other GE sites work because their PXE LANs aren't on 10.x at all.

Renumber PXE LAN to RFC1918 172.16.9.0/24 so the GE filter naturally
skips wired PXE addresses without any disable-NIC dance.

Server-side already in flight (netplan dual-bound, dnsmasq scope +
boot URL repointed, blancco preferences + grub.cfg + iPXE GetPxeScript
all sed'd to 172.16.9.1). This commit is the playbook / scripts /
docs side: 109 hits across 35 files sed'd in one shot.

After this lands + boot.wim is rebuilt + bays renumber off DHCP,
the 10.9.100.1 binding will be dropped from netplan as the final
cleanup step.

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

playbook/shopfloor-setup/gea-shopfloor-nocollections/03-RestoreEDncConfig.ps1

@@ -54,7 +54,8 @@ if (-not $machineNum -or $machineNum -eq '9999') {
 Write-Host "Machine number: $machineNum"
 
 # ---- Locate local backup root (staged from PXE during imaging) ----
-$backupRoot = 'C:\Enrollment\shopfloor-setup\Standard\ntlars-backups'
+# Lives at C:\Enrollment\shopfloor-setup\_ntlars-backups (shared root dir).
+$backupRoot = Join-Path $PSScriptRoot '..\_ntlars-backups'
 if (-not (Test-Path $backupRoot)) {
     Write-Host "ntlars-backups folder not staged at $backupRoot - skipping."
     try { Stop-Transcript | Out-Null } catch {}