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

windows/apps/claude-code.ps1

@@ -1,10 +1,10 @@
-<#
+<#
     LXS - Claude Code (Windows)
     Description: Install and check the Claude Code CLI.
 
     Two supported install methods, both official:
-      - winget (Anthropic.ClaudeCode) — does not auto-update
-      - the native installer from claude.ai — updates itself in the background
+      - winget (Anthropic.ClaudeCode) - does not auto-update
+      - the native installer from claude.ai - updates itself in the background
 
     Repo: https://git.hyko.cx/hykocx/lxs
 #>
@@ -24,7 +24,10 @@ 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', '')))
 }
 
 $env:LXS_LOG_FILE = Join-Path (Get-LxsTempDir) 'lxs_claude_code.log'
@@ -67,7 +70,7 @@ function Install-LxsClaudeWinget {
     Write-Host ''
     Write-Host 'Installs the Anthropic.ClaudeCode package.'
     Write-Host ''
-    Write-Host "$($script:Gray)winget installs do not update themselves — run option 5, or$($script:NC)"
+    Write-Host "$($script:Gray)winget installs do not update themselves - run option 5, or$($script:NC)"
     Write-Host "$($script:Gray)$('winget upgrade Anthropic.ClaudeCode'), to get new versions.$($script:NC)"
     Write-Host ''
     if (-not (Confirm-LxsAction -Question 'Install Claude Code with winget?' -DefaultYes)) {