refactor(windows scripts): remove BOM and improve UTF-8 handling

windows/tools/debloat.ps1

@@ -1,4 +1,4 @@
-<#
+<#
     LXS - Debloat and privacy (Windows)
     Description: Remove preinstalled apps you pick, and turn off telemetry,
                  Cortana, ads, tracking tasks, Copilot and Recall.
@@ -27,7 +27,10 @@ if ($LxsLibPath -and (Test-Path $LxsLibPath)) {
         Write-Error 'Failed to fetch lib/common.ps1'
         exit 1
     }
-    . ([scriptblock]::Create($LxsLibSource))
+    # The library ships with a UTF-8 BOM (Windows PowerShell 5.1 needs it to
+    # read the file as UTF-8); over HTTP that BOM arrives as a leading U+FEFF
+    # character, which the parser will not accept.
+    . ([scriptblock]::Create(($LxsLibSource -replace '^\uFEFF', '')))
 }
 
 $env:LXS_LOG_FILE = Join-Path (Get-LxsTempDir) 'lxs_debloat.log'
@@ -57,9 +60,9 @@ function Assert-LxsCheckpoint {
 # ═══════════════════════════════════════════════════════════════════════════
 # Preinstalled apps
 #
-# Only packages on this list are ever offered. Anything not listed here —
+# Only packages on this list are ever offered. Anything not listed here -
 # including the Store, App Installer (winget), Terminal, Defender UI, the
-# VCLibs/.NET runtime frameworks and every driver package — is left alone,
+# VCLibs/.NET runtime frameworks and every driver package - is left alone,
 # because removing those breaks Windows or LXS itself.
 # ═══════════════════════════════════════════════════════════════════════════
 
@@ -152,13 +155,13 @@ function Remove-LxsSelectedApps {
 
     Write-Host ''
     Write-Host "$($script:Gray)Enter the numbers to remove, separated by commas (e.g. 1,4,7),$($script:NC)"
-    Write-Host "$($script:Gray)or 'all' for every entry above. Empty cancels — nothing is removed$($script:NC)"
+    Write-Host "$($script:Gray)or 'all' for every entry above. Empty cancels - nothing is removed$($script:NC)"
     Write-Host "$($script:Gray)unless you name it here.$($script:NC)"
     Write-Host ''
     $selection = Read-Host -Prompt 'Selection'
 
     if ([string]::IsNullOrWhiteSpace($selection)) {
-        Write-LxsInfo 'Cancelled — nothing removed.'
+        Write-LxsInfo 'Cancelled - nothing removed.'
         return
     }
 
@@ -347,7 +350,7 @@ function Invoke-LxsTweakGroup {
             Disable-ScheduledTask -TaskName $leaf -TaskPath $parent -ErrorAction Stop | Out-Null
             $disabled++
         } catch {
-            # Absent on this edition/build — nothing to disable.
+            # Absent on this edition/build - nothing to disable.
         }
     }
     Write-LxsOk "$disabled tracking scheduled task(s) disabled"
@@ -360,7 +363,7 @@ function Restore-LxsTweaks {
     Write-Host 'This restores every registry value, service and scheduled task that'
     Write-Host 'this script changes, back to the Windows default.'
     Write-Host ''
-    Write-Host "$($script:Gray)Apps you removed are NOT restored — reinstall them from the Store.$($script:NC)"
+    Write-Host "$($script:Gray)Apps you removed are NOT restored - reinstall them from the Store.$($script:NC)"
     Write-Host ''
     if (-not (Confirm-LxsAction -Question 'Revert the privacy tweaks?')) {
         Write-LxsInfo 'Cancelled.'
@@ -374,13 +377,13 @@ function Restore-LxsTweaks {
                 if (Test-Path $e.Path) {
                     Remove-ItemProperty -Path $e.Path -Name $e.Name -ErrorAction Stop
                 }
-                Write-LxsOk "$($e.Label) — policy removed"
+                Write-LxsOk "$($e.Label) - policy removed"
             } catch {
                 # Already absent: that is the default state we wanted.
             }
         } else {
             if (Set-LxsRegistryValue -Path $e.Path -Name $e.Name -Value $e.Default) {
-                Write-LxsOk "$($e.Label) — restored to default"
+                Write-LxsOk "$($e.Label) - restored to default"
             }
         }
     }