Use [Environment]::MachineName instead of $env:COMPUTERNAME

Live kernel NetBIOS name instead of the PowerShell process-env cache.

$env:COMPUTERNAME is populated when PowerShell starts and does not
update if the PC gets renamed (common on Intune-managed Autopilot /
AADJ devices that come up with a DESKTOP-XXXXXXXX name and get
renamed by policy post-imaging). Until the next reboot, the env var
stays stale while 'hostname.exe' already reports the new name.

That mismatch showed up live on the first production retrofit: the
status.json was written under _outputs/logs/DESKTOP-XXXXXXXX/
instead of under the device's current name, and the
TargetHostnames filter and monitor drift-check would likewise see
the stale name.

[Environment]::MachineName reads from the kernel on each call, so
it always returns the current NetBIOS name. Swapped at all five
callsites in GE-Enforce.ps1, Register-GEEnforce.ps1, and
Install-FromManifest.ps1.

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

playbook/shopfloor-setup/common/GE-Enforce.ps1

@@ -182,7 +182,11 @@ try {
     # continues if the share path is not writable.
     # ------------------------------------------------------------------
     try {
-        $statusDir  = Join-Path (Join-Path $driveLetter '_outputs') (Join-Path 'logs' $env:COMPUTERNAME)
+        # Live NetBIOS name from kernel - not $env:COMPUTERNAME, which is
+        # cached in the process env block and goes stale after a post-image
+        # rename on Intune-managed PCs.
+        $hostname   = [System.Environment]::MachineName
+        $statusDir  = Join-Path (Join-Path $driveLetter '_outputs') (Join-Path 'logs' $hostname)
         if (-not (Test-Path $statusDir)) {
             New-Item -Path $statusDir -ItemType Directory -Force -ErrorAction Stop | Out-Null
         }
@@ -223,7 +227,7 @@ try {
         }
 
         $status = [ordered]@{
-            hostname          = $env:COMPUTERNAME
+            hostname          = $hostname
             lastCheckIn       = (Get-Date).ToUniversalTime().ToString('o')
             pcType            = $pcType
             pcSubType         = $pcSubType