docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

src/ZB.MOM.WW.MxGateway.Tests/Gateway/Workers/FakeWorkerHarnessTests.cs

@@ -11,6 +11,7 @@ public sealed class FakeWorkerHarnessTests
     private static readonly TimeSpan TestTimeout = TimeSpan.FromSeconds(5);
 
     /// <summary>Verifies that completing startup with hello and ready transitions the client to ready state.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task CompleteStartupAsync_WithHelloAndReady_TransitionsClientToReady()
     {
@@ -28,6 +29,7 @@ public sealed class FakeWorkerHarnessTests
     }
 
     /// <summary>Verifies that a protocol version mismatch during startup fails the client.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task StartAsync_WithProtocolMismatch_FailsStartup()
     {
@@ -47,6 +49,7 @@ public sealed class FakeWorkerHarnessTests
     }
 
     /// <summary>Verifies that a scripted reply completes a pending command invocation.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task InvokeAsync_WithScriptedReply_CompletesCommand()
     {
@@ -69,6 +72,7 @@ public sealed class FakeWorkerHarnessTests
     }
 
     /// <summary>Verifies that scripted events are yielded in order through the event stream.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadEventsAsync_WithScriptedEvents_YieldsOrderedEvents()
     {
@@ -93,6 +97,7 @@ public sealed class FakeWorkerHarnessTests
     }
 
     /// <summary>Verifies that a scripted fault from the worker faults the client.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadLoop_WithScriptedFault_FaultsClient()
     {
@@ -116,6 +121,7 @@ public sealed class FakeWorkerHarnessTests
     /// <see cref="ManualTimeProvider"/> so the timestamp advance is deterministic rather
     /// than relying on a wall-clock <c>Task.Delay</c> exceeding clock resolution.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task SendHeartbeatAsync_UpdatesClientHeartbeatState()
     {
@@ -138,6 +144,7 @@ public sealed class FakeWorkerHarnessTests
     }
 
     /// <summary>Verifies that a hung worker times out pending command invocations.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task InvokeAsync_WithHungWorker_TimesOutPendingCommand()
     {
@@ -159,6 +166,7 @@ public sealed class FakeWorkerHarnessTests
     }
 
     /// <summary>Verifies that a malformed frame in the read loop faults the client.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadLoop_WithMalformedFrame_FaultsClient()
     {
@@ -176,6 +184,7 @@ public sealed class FakeWorkerHarnessTests
     }
 
     /// <summary>Verifies that a shutdown acknowledgment from the worker closes the client.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ShutdownAsync_WithShutdownAck_ClosesClient()
     {
@@ -196,6 +205,7 @@ public sealed class FakeWorkerHarnessTests
     /// Verifies that RespondToControlCommandAsync echoes the Ping message back
     /// in the DiagnosticMessage field, matching the real worker's ping reply shape.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task RespondToControlCommandAsync_Ping_EchoesMessageInDiagnostic()
     {
@@ -220,6 +230,7 @@ public sealed class FakeWorkerHarnessTests
     /// Verifies that RespondToControlCommandAsync returns a SessionStateReply
     /// with state Ready for a GetSessionState command.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task RespondToControlCommandAsync_GetSessionState_ReturnsReadyState()
     {
@@ -245,6 +256,7 @@ public sealed class FakeWorkerHarnessTests
     /// Verifies that RespondToControlCommandAsync returns a WorkerInfoReply
     /// with the fake worker's process ID, version, and MXAccess identifiers.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task RespondToControlCommandAsync_GetWorkerInfo_ReturnsFakeWorkerInfo()
     {
@@ -273,6 +285,7 @@ public sealed class FakeWorkerHarnessTests
     /// Verifies that RespondToControlCommandAsync returns an empty DrainEventsReply
     /// for a DrainEvents command (the fake harness has no queued events).
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task RespondToControlCommandAsync_DrainEvents_ReturnsEmptyReply()
     {
@@ -298,6 +311,7 @@ public sealed class FakeWorkerHarnessTests
     /// Verifies that RespondToControlCommandAsync for ShutdownWorker sends an OK
     /// reply followed by a WorkerShutdownAck, which closes the client.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task RespondToControlCommandAsync_ShutdownWorker_SendsReplyThenAck()
     {