Sub-type aware preinstall, USB drivers/PPKGs, Lab OpenText

- PreInstall runner reads pc-subtype.txt and matches PCTypes against
  both base type (Standard) and composite key (Standard-Machine).
- UDC scoped to Standard-Machine only. eDNC and MachineNumberACLs
  skip on Standard-Timeclock sub-type.
- Lab added to OpenText PCTypes.
- build-usb.sh copies enrollment/ (PPKGs) and drivers-staging/ (Dell
  driver packs) onto USB for self-contained deployment.
- Playbook deploys PPKGs and drivers from USB to PXE server shares.
- Gitignore enrollment/, drivers-staging/, *.ppkg (large binaries).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

build-usb.sh

@@ -282,6 +282,18 @@ else
     echo "    No enrollment/ directory found (PPKGs can be uploaded via webapp later)"
 fi
 
+# Copy Dell driver packs if staged
+DRIVERS_DIR="$SCRIPT_DIR/drivers-staging"
+if [ -d "$DRIVERS_DIR" ] && [ "$(ls -A "$DRIVERS_DIR" 2>/dev/null)" ]; then
+    echo "    Copying Dell driver packs from drivers-staging/..."
+    mkdir -p "$MOUNT_POINT/drivers"
+    cp -r "$DRIVERS_DIR"/* "$MOUNT_POINT/drivers/" 2>/dev/null || true
+    DRIVERS_SIZE=$(du -sh "$MOUNT_POINT/drivers" | cut -f1)
+    echo "    Copied drivers/ ($DRIVERS_SIZE)"
+else
+    echo "    No drivers-staging/ found (drivers can be downloaded later)"
+fi
+
 # Optionally copy WinPE deployment images
 if [ -n "$WINPE_SOURCE" ] && [ -d "$WINPE_SOURCE" ]; then
     echo "    Copying WinPE deployment content from $WINPE_SOURCE..."