Scripts work under pwsh on Linux and macOS

Home, VS Code user folder and CLI are resolved per platform (with
VSCODE_USER_DIR as an override); dev-link makes a symlink where a
junction is not available.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0169iPWwKHZoBTNN9qwXiwqk

scripts/settings.ps1

@@ -35,11 +35,11 @@ $ErrorActionPreference = 'Stop'
 . (Join-Path $PSScriptRoot 'common.ps1')
 
 $repoUser = Join-Path (Get-RepoRoot) 'User'
-$codeUser = Join-Path $env:APPDATA 'Code\User'
+$codeUser = Get-CodeUserDir
 
 if (-not (Test-Path $codeUser)) {
     throw ("VS Code's user folder was not found at $codeUser. If you use Insiders or a " +
-           "portable install, point APPDATA at it or copy by hand.")
+           "portable install, set VSCODE_USER_DIR to it or copy by hand.")
 }
 
 # Only the things worth version-controlling. Everything else in User/ is state: