Code review fixes for Linux enterprise config defaults

[Copilot]

Code review of the Linux enterprise deployable default settings implementation (git-ecosystem#1814) identified several issues affecting correctness and clarity.

Changes

• Fix non-deterministic file ordering: EnumerateFiles provides no ordering guarantee. Added explicit .OrderBy(Path.GetFileName) to ensure alphabetical processing as documented.

• Remove incorrect import: Deleted unused Avalonia.Markup.Xaml.MarkupExtensions namespace.

• Clarify null-coalescing logic: Simplified !_extConfigCache?.TryGetValue(...) ?? false to _extConfigCache == null || !_extConfigCache.TryGetValue(...) for readability.

• Correct documentation: Fixed XML comment path from /etc/git-credential-manager.d to /etc/git-credential-manager/config.d.

// Before: non-deterministic order
IEnumerable<string> files = _fs.EnumerateFiles(configDir, "*");

// After: guaranteed alphabetical ordering by filename
IEnumerable<string> files = _fs.EnumerateFiles(configDir, "*").OrderBy(f => Path.GetFileName(f));

The file ordering fix is critical for predictable config precedence when multiple files exist in /etc/git-credential-manager/config.d.

Warning

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• av-build-tel-api-v1.avaloniaui.net
  • Triggering command: /usr/share/dotnet/dotnet dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/0.0.29/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/0.0.29/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll (dns block)
• www.apple.com
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[mdellison90-stack]

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