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

clients/dotnet/MxGateway.Client/MxCommandReplyExtensions.cs

@@ -2,8 +2,11 @@ using MxGateway.Contracts.Proto;
 
 namespace MxGateway.Client;
 
+/// <summary>Extension methods for checking MxCommandReply success conditions.</summary>
 public static class MxCommandReplyExtensions
 {
+    /// <summary>Validates that the reply has a successful protocol status (Ok or MxAccessFailure), throwing a gateway exception if not.</summary>
+    /// <param name="reply">The command reply to check.</param>
     public static MxCommandReply EnsureProtocolSuccess(this MxCommandReply reply)
     {
         ArgumentNullException.ThrowIfNull(reply);
@@ -19,6 +22,8 @@ public static class MxCommandReplyExtensions
         throw CreateProtocolException(reply, code);
     }
 
+    /// <summary>Validates that the reply indicates MXAccess success (no HResult or status failures), throwing MxAccessException if not.</summary>
+    /// <param name="reply">The command reply to check.</param>
     public static MxCommandReply EnsureMxAccessSuccess(this MxCommandReply reply)
     {
         ArgumentNullException.ThrowIfNull(reply);