GE-Enforce: write machineNumber + bump enforcerVersion to 2.5

Adds machineNumber field to status.json (read from C:\Enrollment\machine-number.txt).
Bumps enforcerVersion to '2.5' so check-fleet-convergence.txt's column
flips when fleet picks up the self-update. Pairs with the Install-FromManifest
v2.5 (WaitTimeoutSec) so both bumps land together.

Convergence-check txt updated to display the new MN column.

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

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

@@ -280,12 +280,20 @@ try {
             }
         }
 
+        $machineNumber = ''
+        try {
+            if (Test-Path 'C:\Enrollment\machine-number.txt') {
+                $machineNumber = (Get-Content 'C:\Enrollment\machine-number.txt' -First 1 -ErrorAction SilentlyContinue).Trim()
+            }
+        } catch {}
+
         $status = [ordered]@{
             hostname          = $hostname
+            machineNumber     = $machineNumber
             lastCheckIn       = (Get-Date).ToUniversalTime().ToString('o')
             pcType            = $pcType
             pcSubType         = $pcSubType
-            enforcerVersion   = '2.4'
+            enforcerVersion   = '2.5'
             shopfloorShareRoot = $shopfloorShareRoot
             scopesProcessed   = $scopeResults
             installedVersions = $installedVersions