Replace all Unicode characters with ASCII in playbook scripts

Em dashes (U+2014) and arrows (U+2192) break PowerShell 5.1 on
Windows when the file has no UTF-8 BOM -- byte 0x94 gets read as
a right double quote in Windows-1252, silently closing strings
mid-parse. This caused run-enrollment.ps1 to fail on PXE-imaged
machines with "string is missing the terminator" at line 113.

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

playbook/shopfloor-setup/Shopfloor/06-OrganizeDesktop.ps1

@@ -336,7 +336,7 @@ function Add-ShopfloorToolsApps {
                 $src = Find-ExistingLnk $app.SourceName
                 if ($src) {
                     # Skip if the sweep already moved the source into the
-                    # destination folder (src == dest → "cannot overwrite
+                    # destination folder (src == dest -> "cannot overwrite
                     # the item with itself").
                     if ((Resolve-Path -LiteralPath $src -ErrorAction SilentlyContinue).Path -eq
                         (Join-Path $shopfloorToolsDir $app.SourceName)) {
@@ -390,7 +390,7 @@ function Remove-EmptyCategoryFolders {
 # are delivered by DSC AFTER this initial shopfloor setup, so the first
 # run at imaging time won't find them (falls back to hardcoded URLs,
 # Plant Apps gets skipped). By calling 08 from inside 06, every SYSTEM
-# scheduled-task logon re-run of 06 also re-runs 08 — so after DSC drops
+# scheduled-task logon re-run of 06 also re-runs 08 -- so after DSC drops
 # the .url files and the next sweep files them into Web Links\, 08
 # picks them up and updates the Edge policy. Self-healing.
 # ============================================================================