Add XML documentation across gateway, worker, and .NET client

clients/dotnet/MxGateway.Client/MxStatusProxyExtensions.cs

@@ -2,8 +2,11 @@ using MxGateway.Contracts.Proto;
 
 namespace MxGateway.Client;
 
+/// <summary>Extension methods for MxStatusProxy values.</summary>
 public static class MxStatusProxyExtensions
 {
+    /// <summary>Returns whether the status indicates success (success flag set and category is Ok).</summary>
+    /// <param name="status">The status to check.</param>
     public static bool IsSuccess(this MxStatusProxy status)
     {
         ArgumentNullException.ThrowIfNull(status);
@@ -12,6 +15,8 @@ public static class MxStatusProxyExtensions
             && status.Category is MxStatusCategory.Ok;
     }
 
+    /// <summary>Returns a formatted summary of the status for diagnostic output.</summary>
+    /// <param name="status">The status to summarize.</param>
     public static string ToDiagnosticSummary(this MxStatusProxy status)
     {
         ArgumentNullException.ThrowIfNull(status);