fix: Preserve CRLF line endings in DOS BAT files during sync

Critical fix for DOS 6.22 compatibility - CRLF line endings were being
converted to LF during AD2-to-NAS sync, causing BAT files to fail on DOS.

Root Cause:
- OpenSSH scp uses SFTP protocol by default (text mode)
- SFTP converts line endings (CRLF → LF)
- DOS 6.22 requires CRLF for batch file execution

Solution - Fixed AD2 Sync Script:
- Added -O flag to scp commands in Sync-FromNAS.ps1
- Forces legacy SCP protocol (binary mode)
- Preserves CRLF line endings during transfer

Created deployment scripts:
- fix-ad2-scp-line-endings.ps1: Updates Sync-FromNAS.ps1 with -O flag
- deploy-all-bat-files.ps1: Deploy 6 BAT files to AD2 (UPDATE, NWTOC,
  CTONW, CHECKUPD, REBOOT, DEPLOY)
- deploy-bat-to-nas-direct.ps1: Direct SCP to NAS with -O flag for
  immediate testing
- verify-nas-crlf.ps1: Validates CRLF preservation on NAS

Created diagnostic scripts:
- check-line-endings.ps1: Compare original vs NAS file line endings
- check-ad2-sync-log.ps1: Monitor sync log on AD2
- check-ad2-bat-files.ps1: Verify files on AD2
- check-scp-commands.ps1: Analyze SCP command usage
- trigger-ad2-sync-now.ps1: Manual sync trigger for testing

Verification:
- DEPLOY.BAT: 9,753 bytes with CRLF (was 9,408 bytes with LF)
- All 6 BAT files deployed to NAS with CRLF preserved
- DOS machines can now execute batch files from T:\

Files deployed:
- DEPLOY.BAT (one-time installer)
- UPDATE.BAT (backup utility)
- NWTOC.BAT (network to computer updates)
- CTONW.BAT (computer to network uploads)
- CHECKUPD.BAT (check for updates)
- REBOOT.BAT (reboot utility)

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

check-line-endings.ps1

@@ -0,0 +1,53 @@
+# Check line endings in BAT files
+
+Write-Host "[INFO] Checking line endings..."
+Write-Host ""
+
+# Check original
+$Original = Get-Content "DEPLOY.BAT" -Raw
+$HasCRLF_Original = $Original -match "`r`n"
+$HasLF_Original = $Original -match "[^`r]`n"
+
+Write-Host "DEPLOY.BAT (Original):"
+if ($HasCRLF_Original) {
+    Write-Host "  [OK] Contains CRLF (DOS-compatible)"
+} elseif ($HasLF_Original) {
+    Write-Host "  [WARNING] Contains LF only (Unix format)"
+} else {
+    Write-Host "  [UNKNOWN] No line breaks detected"
+}
+
+Write-Host ""
+
+# Check NAS copy
+if (Test-Path "DEPLOY_FROM_NAS.BAT") {
+    $FromNAS = Get-Content "DEPLOY_FROM_NAS.BAT" -Raw
+    $HasCRLF_NAS = $FromNAS -match "`r`n"
+    $HasLF_NAS = $FromNAS -match "[^`r]`n"
+
+    Write-Host "DEPLOY_FROM_NAS.BAT (From NAS):"
+    if ($HasCRLF_NAS) {
+        Write-Host "  [OK] Contains CRLF (DOS-compatible)"
+    } elseif ($HasLF_NAS) {
+        Write-Host "  [ERROR] Contains LF only (Unix format - DOS won't work!)"
+    } else {
+        Write-Host "  [UNKNOWN] No line breaks detected"
+    }
+
+    # Compare file sizes
+    $OrigSize = (Get-Item "DEPLOY.BAT").Length
+    $NASSize = (Get-Item "DEPLOY_FROM_NAS.BAT").Length
+
+    Write-Host ""
+    Write-Host "File Sizes:"
+    Write-Host "  Original: $OrigSize bytes"
+    Write-Host "  From NAS: $NASSize bytes"
+
+    if ($OrigSize -ne $NASSize) {
+        Write-Host "  [WARNING] Size mismatch - line endings may have been converted"
+    } else {
+        Write-Host "  [OK] Sizes match"
+    }
+} else {
+    Write-Host "[ERROR] DEPLOY_FROM_NAS.BAT not found"
+}