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

src/MxGateway.Tests/Gateway/Workers/WorkerClientTests.cs

@@ -14,6 +14,7 @@ public sealed class WorkerClientTests
     private const int WorkerProcessId = 4321;
     private static readonly TimeSpan TestTimeout = TimeSpan.FromSeconds(5);
 
+    /// <summary>Verifies that StartAsync enters ready state after receiving worker hello and ready messages.</summary>
     [Fact]
     public async Task StartAsync_WithWorkerHelloAndReady_EntersReadyState()
     {
@@ -26,6 +27,7 @@ public sealed class WorkerClientTests
         Assert.Equal(WorkerProcessId, client.ProcessId);
     }
 
+    /// <summary>Verifies that InvokeAsync completes a pending command when a matching reply arrives.</summary>
     [Fact]
     public async Task InvokeAsync_WithMatchingReply_CompletesPendingCommand()
     {
@@ -51,6 +53,7 @@ public sealed class WorkerClientTests
         Assert.Equal(MxCommandKind.Ping, reply.Reply.Kind);
     }
 
+    /// <summary>Verifies that InvokeAsync ignores late replies and keeps the client ready.</summary>
     [Fact]
     public async Task InvokeAsync_WithLateReply_IgnoresLateReplyAndKeepsClientReady()
     {
@@ -86,6 +89,7 @@ public sealed class WorkerClientTests
         Assert.Equal(MxCommandKind.GetWorkerInfo, reply.Reply.Kind);
     }
 
+    /// <summary>Verifies that ReadEventsAsync yields events in pipe order from the worker.</summary>
     [Fact]
     public async Task ReadEventsAsync_WithWorkerEvents_YieldsEventsInPipeOrder()
     {
@@ -111,6 +115,7 @@ public sealed class WorkerClientTests
         Assert.Equal(MxEventFamily.OperationComplete, events.Current.Event.Family);
     }
 
+    /// <summary>Verifies that the read loop faults the client when the event queue overflows.</summary>
     [Fact]
     public async Task ReadLoop_WhenEventQueueOverflows_FaultsClient()
     {
@@ -137,6 +142,7 @@ public sealed class WorkerClientTests
         Assert.Equal(WorkerClientState.Faulted, client.State);
     }
 
+    /// <summary>Verifies that the read loop faults the client when the pipe disconnects.</summary>
     [Fact]
     public async Task ReadLoop_WhenPipeDisconnects_FaultsClient()
     {
@@ -153,6 +159,7 @@ public sealed class WorkerClientTests
         Assert.Equal(WorkerClientState.Faulted, client.State);
     }
 
+    /// <summary>Verifies that the read loop stops the running worker metric when the pipe disconnects.</summary>
     [Fact]
     public async Task ReadLoop_WhenPipeDisconnects_StopsRunningWorkerMetric()
     {
@@ -175,6 +182,7 @@ public sealed class WorkerClientTests
         Assert.Equal(1, snapshot.WorkerExits);
     }
 
+    /// <summary>Verifies that DisposeAsync returns within a bounded timeout when the pipe read is blocked.</summary>
     [Fact]
     public async Task DisposeAsync_WhenPipeReadIsBlocked_ReturnsWithinBoundedTimeout()
     {
@@ -191,6 +199,7 @@ public sealed class WorkerClientTests
             $"DisposeAsync took {elapsed.TotalMilliseconds:N0}ms.");
     }
 
+    /// <summary>Verifies that the read loop updates the last heartbeat and worker process when a heartbeat arrives.</summary>
     [Fact]
     public async Task ReadLoop_WhenHeartbeatArrives_UpdatesLastHeartbeatAndWorkerProcess()
     {
@@ -209,6 +218,7 @@ public sealed class WorkerClientTests
         Assert.Equal(WorkerClientState.Ready, client.State);
     }
 
+    /// <summary>Verifies that the heartbeat monitor faults the client when the heartbeat expires.</summary>
     [Fact]
     public async Task HeartbeatMonitor_WhenHeartbeatExpires_FaultsClient()
     {
@@ -393,12 +403,16 @@ public sealed class WorkerClientTests
             WorkerWriter = new WorkerFrameWriter(_workerStream, new WorkerFrameProtocolOptions(SessionId));
         }
 
+        /// <summary>The gateway side of the named pipe connection.</summary>
         public NamedPipeServerStream GatewayStream { get; }
 
+        /// <summary>Frame reader for worker messages.</summary>
         public WorkerFrameReader WorkerReader { get; }
 
+        /// <summary>Frame writer for worker messages.</summary>
         public WorkerFrameWriter WorkerWriter { get; }
 
+        /// <summary>Creates a connected pipe pair for testing.</summary>
         public static async Task<PipePair> CreateAsync()
         {
             string pipeName = $"mxaccessgw-workerclient-tests-{Guid.NewGuid():N}";
@@ -421,6 +435,7 @@ public sealed class WorkerClientTests
             return new PipePair(gatewayStream, workerStream);
         }
 
+        /// <summary>Disposes the worker side of the pipe.</summary>
         public async ValueTask DisposeWorkerSideAsync()
         {
             if (_workerSideDisposed)
@@ -432,6 +447,7 @@ public sealed class WorkerClientTests
             _workerSideDisposed = true;
         }
 
+        /// <summary>Disposes the duplex stream.</summary>
         public async ValueTask DisposeAsync()
         {
             await DisposeWorkerSideAsync();