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

clients/dotnet/MxGateway.Client.Tests/MxValueExtensionsTests.cs

@@ -7,6 +7,7 @@ namespace MxGateway.Client.Tests;
 
 public sealed class MxValueExtensionsTests
 {
+    /// <summary>Verifies that scalar values are converted to correctly-typed MxValue protobuf messages.</summary>
     [Fact]
     public void ToMxValue_WithScalarValues_CreatesTypedProtobufValues()
     {
@@ -18,6 +19,7 @@ public sealed class MxValueExtensionsTests
         Assert.Equal(MxValue.KindOneofCase.StringValue, "alpha".ToMxValue().KindCase);
     }
 
+    /// <summary>Verifies that array values are converted to array-kind MxValue messages with correct element types and dimensions.</summary>
     [Fact]
     public void ToMxValue_WithArrays_CreatesTypedArrayProtobufValues()
     {
@@ -29,6 +31,7 @@ public sealed class MxValueExtensionsTests
         Assert.Equal([2U], value.ArrayValue.Dimensions);
     }
 
+    /// <summary>Verifies that fixture test cases project to expected MxValue kinds and preserve raw type metadata.</summary>
     [Fact]
     public void FixtureValues_ProjectExpectedKindsAndPreserveRawMetadata()
     {