CMM: gocmm-debug probes the startup NRE (part-group match), checks real exe

goCMM matches the registry 'Selected Part Group' against the
ApplicationSettings.xml <PartGroup FullName> entries with a case-sensitive
compare. No match -> SelectedPartGroup null -> "Object reference not set to
an instance of an object" at start. This is a different failure from the
registry SecurityException the script already probes.

- PROBE 3: read the reg value (32-bit view) + every FullName in the XML,
  Ordinal-compare, and report exact / case-only / no-match / missing-XML.
  Case-only and no-match name the d441abd canonicalization fix as the remedy.
- Version check now looks for the real goCMM.exe, not the nonexistent
  GEAOperatorFriendlyInterface.exe (was a false MISSING).
- .bat header documents both failure modes it now diagnoses.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

playbook/shopfloor-setup/gea-shopfloor-cmm/scripts/gocmm-debug.ps1

@@ -93,14 +93,74 @@ W "  exported -> $regOut"
 W ""
 
 W "================ goCMM version + install ================"
+# The goCMM MSI installs goCMM.exe (1.1.6718.x) to this dir and points the Start
+# Menu shortcut at it - goCMM.exe IS the launcher. (An earlier version of this
+# script checked for GEAOperatorFriendlyInterface.exe, which this product does
+# NOT install - that produced a false MISSING. Check the real exe.)
 foreach ($p in @(
-    'C:\Program Files (x86)\General Electric\goCMM\GEAOperatorFriendlyInterface.exe',
+    'C:\Program Files (x86)\General Electric\goCMM\goCMM.exe',
     'C:\Program Files (x86)\General Electric\goCMM\GEA_OFI_Common.dll')) {
     if (Test-Path $p) { $vi = (Get-Item $p).VersionInfo; W ("  {0}  FileVer={1} ProductVer={2}" -f (Split-Path $p -Leaf), $vi.FileVersion, $vi.ProductVersion) }
     else { W "  MISSING: $p" }
 }
 W ""
 
+W "================ PROBE 3: Selected Part Group vs ApplicationSettings.xml (the startup NRE) ================"
+# goCMM at start matches the registry 'Selected Part Group' against the
+# <PartGroup FullName> entries in ApplicationSettings.xml with a CASE-SENSITIVE
+# (Ordinal) compare. No match -> SelectedPartGroup is null -> a startup deref
+# throws "Object reference not set to an instance of an object". This is a
+# DIFFERENT failure from the registry SecurityException probed above.
+# Mismatch forms seen: host (bare vs FQDN) and share segment (\shared vs \SHARED).
+try {
+    $base32 = [Microsoft.Win32.RegistryKey]::OpenBaseKey('LocalMachine','Registry32')
+    $kpg = $base32.OpenSubKey($key32native, $false)
+    $regPg = $null; $sharedDir = 'C:\geaofi'
+    if ($kpg) {
+        $regPg = [string]$kpg.GetValue('Selected Part Group','')
+        $sd = [string]$kpg.GetValue('Shared Data Directory','')
+        if ($sd) { $sharedDir = $sd.TrimEnd('\') }
+        $kpg.Close()
+    }
+    W ("  reg 'Selected Part Group' = [{0}]" -f $regPg)
+    W ("  Shared Data Directory     = {0}" -f $sharedDir)
+
+    $xml = Join-Path $sharedDir 'ApplicationSettings.xml'
+    if (-not (Test-Path $xml)) {
+        W "  *** ApplicationSettings.xml NOT FOUND at $xml - no part groups to match -> null SelectedPartGroup -> NRE likely. <<"
+    } else {
+        $txt = [System.IO.File]::ReadAllText($xml)
+        # Capture FullName in both attribute (FullName="...") and element (<FullName>...</FullName>) forms.
+        $names = New-Object System.Collections.Generic.List[string]
+        foreach ($m in [regex]::Matches($txt, 'FullName\s*=\s*"([^"]*)"')) { $names.Add($m.Groups[1].Value) }
+        foreach ($m in [regex]::Matches($txt, '<FullName>([^<]*)</FullName>')) { $names.Add($m.Groups[1].Value) }
+        $names = $names | Select-Object -Unique
+        W ("  ApplicationSettings.xml part-group FullName entries ({0}):" -f @($names).Count)
+        foreach ($n in $names) { W ("    [{0}]" -f $n) }
+
+        if (-not $regPg) {
+            W "  >> reg 'Selected Part Group' is EMPTY - goCMM has no part group pinned -> null -> NRE likely. <<"
+        } else {
+            $exact = $false; $caseOnly = $false
+            foreach ($n in $names) {
+                if ([string]::Equals($n, $regPg, [StringComparison]::Ordinal)) { $exact = $true; break }
+                if ([string]::Equals($n, $regPg, [StringComparison]::OrdinalIgnoreCase)) { $caseOnly = $true }
+            }
+            if ($exact) {
+                W "  >> MATCH: reg value matches an XML FullName exactly (case-sensitive). Part group is NOT the NRE cause. <<"
+            } elseif ($caseOnly) {
+                W "  >> *** CASE-ONLY MATCH *** reg value matches an XML entry only when case is ignored."
+                W "  >> goCMM's compare is case-sensitive -> Find returns null -> SelectedPartGroup null -> NRE. <<"
+                W "  >> FIX: re-run Install-goCMMSettings.ps1 (>= commit d441abd canonicalizes host + \SHARED case). <<"
+            } else {
+                W "  >> *** NO MATCH *** reg 'Selected Part Group' is absent from ApplicationSettings.xml (any case)."
+                W "  >> Find returns null -> SelectedPartGroup null -> NRE. Wrong per-bay override, or XML from a different bay. <<"
+            }
+        }
+    }
+} catch { W "  ERROR in part-group probe: $($_.Exception.Message)" }
+W ""
+
 W "================ UAC / registry virtualization ================"
 (reg query "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v EnableLUA 2>&1 | Out-String) | W
 (reg query "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v EnableVirtualization 2>&1 | Out-String) | W