Add maintenance toolkit, DNC/OnGuard utilities

- Add Invoke-RemoteMaintenance.ps1: Remote maintenance tasks (DISM, SFC, disk cleanup, etc.)
- Add DNC/, dncfix/, edncfix/: DNC configuration utilities
- Add onguard/: OnGuard integration scripts
- Add tools/: Additional utility scripts
- Update remote-execution/README.md with maintenance toolkit docs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

dncfix/fixvtm.bat

@@ -0,0 +1,3 @@
+@echo off
+powershell.exe -ExecutionPolicy Bypass -File ".\vtmfix.ps1"
+pause

dncfix/vtmfix.ps1

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+# Real-time file watcher to strip 0xFF from .pun files
+# Watches folder and cleans files as soon as they're created/modified
+
+$watchFolder = "C:\Dnc_Files\Q"  # Change to your DNC program folder
+$fileFilter = "*.pun"               # Watch .pun files
+
+Write-Host "Watching $watchFolder for new/modified $fileFilter files..."
+Write-Host "Press Ctrl+C to stop"
+
+# Create file system watcher
+$watcher = New-Object System.IO.FileSystemWatcher
+$watcher.Path = $watchFolder
+$watcher.Filter = $fileFilter
+$watcher.IncludeSubdirectories = $true
+$watcher.EnableRaisingEvents = $true
+
+# Define what to do when file is created or changed
+$action = {
+    $path = $Event.SourceEventArgs.FullPath
+    $changeType = $Event.SourceEventArgs.ChangeType
+    
+    Write-Host "$(Get-Date -Format 'HH:mm:ss') - $changeType detected: $path"
+    
+    # Wait a moment for file to finish writing
+    Start-Sleep -Milliseconds 500
+    
+    try {
+        # Read file as bytes
+        $bytes = [System.IO.File]::ReadAllBytes($path)
+        $originalCount = $bytes.Count
+        
+        # Remove all 0xFF bytes
+        $cleaned = $bytes | Where-Object { $_ -ne 255 }
+        $newCount = $cleaned.Count
+        
+        # Only rewrite if we found 0xFF
+        if ($originalCount -ne $newCount) {
+            [System.IO.File]::WriteAllBytes($path, $cleaned)
+            $removed = $originalCount - $newCount
+            Write-Host "  [OK] Cleaned! Removed $removed byte(s) [0xFF]" -ForegroundColor Green
+        } else {
+            Write-Host "  [SKIP] No 0xFF found, file OK" -ForegroundColor Gray
+        }
+    }
+    catch {
+        Write-Host "  [ERROR] $_" -ForegroundColor Red
+    }
+}
+
+# Register event handlers
+Register-ObjectEvent -InputObject $watcher -EventName Created -Action $action
+Register-ObjectEvent -InputObject $watcher -EventName Changed -Action $action
+
+# Keep script running
+try {
+    while ($true) {
+        Start-Sleep -Seconds 1
+    }
+}
+finally {
+    # Cleanup on exit
+    $watcher.Dispose()
+    Write-Host "`nStopped watching folder"
+}