[C# APIView] Static reaction types are incorrectly flagged as needing an enum

Bad code snippet:
```csharp
public static class ReactionTypes {
```

This APIView comment is misrepresenting the code by claiming that known value sets must use an enum (or readonly struct if extensible). The architect noted that this guidance is out-of-date, and that using string literals/static value-holder classes is valid in many .NET types.

Good code snippet:
```csharp
public static class ReactionTypes
{
public const string Like = "like";
public const string Love = "love";
}
```

Start at the C# APIView Copilot guidance or check that produces the enum comment, using the bad static class snippet as a reproduction. Compare its behavior with the static const-string example; done means valid static value-holder classes no longer receive the enum warning while the guidance remains accurate for cases that do require an enum.

Written by the indexing model from the issue text.