fix(reporting): add Platform column and clean up Windows artifacts

- Export-SettingsReport.py: add Platform column for Settings Catalog
  (platforms field) and legacy policies (platform/platformType or
  @odata.type inference)
- MSGraph.psm1: store GraphMetaData.xml in cross-platform data folder
  (Get-CloudApiDataFolder) instead of literal %LOCALAPPDATA% path
- MSALAuthentication.psm1: skip TokenCacheHelperEx on non-Windows with
  an info log instead of failing on missing ProtectedData.dll
- .gitignore: remove literal %LOCALAPPDATA% patterns
- AGENTS.md, CHANGELOG: document reporting and cross-platform fixes

Extensions/MSGraph.psm1

@@ -1186,7 +1186,9 @@ function Get-GraphMetaData
         # There also no other version information in response headers. Use file date to update every week
         Write-Log "Load Graph MetaData file"
         $url = "https://graph.microsoft.com/beta/`$metadata"
-        $fileFullPath = [Environment]::ExpandEnvironmentVariables("%LOCALAPPDATA%\CloudAPIPowerShellManagement\GraphMetaData.xml")
+        $dataFolder = if(Get-Command Get-CloudApiDataFolder -ErrorAction SilentlyContinue) { Get-CloudApiDataFolder } else { [Environment]::ExpandEnvironmentVariables("%LOCALAPPDATA%\macOS_IntuneManagement") }
+        [void][IO.Directory]::CreateDirectory($dataFolder)
+        $fileFullPath = Join-Path $dataFolder "GraphMetaData.xml"
         $fi = [IO.FileInfo]$fileFullPath
         $maxAge = (Get-Date).AddDays(-14)
         if($fi.Exists -and ($fi.LastWriteTime -gt $maxAge -or $fi.CreationTime -gt $maxAge))