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.Worker.Tests/Ipc/WorkerPipeClientTests.cs

@@ -15,6 +15,7 @@ namespace ZB.MOM.WW.MxGateway.Worker.Tests.Ipc;
 public sealed class WorkerPipeClientTests
 {
     /// <summary>Verifies that worker client connects and completes handshake.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task RunAsync_ConnectsToPipeAndCompletesHandshake()
     {
@@ -83,6 +84,7 @@ public sealed class WorkerPipeClientTests
     }
 
     /// <summary>Verifies that worker client retries until pipe server becomes available.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task RunAsync_RetriesUntilPipeServerAppears()
     {
@@ -127,6 +129,7 @@ public sealed class WorkerPipeClientTests
     }
 
     /// <summary>Verifies that worker client throws timeout if pipe never appears.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task RunAsync_WhenPipeNeverAppears_ThrowsTimeoutException()
     {
@@ -148,7 +151,7 @@ public sealed class WorkerPipeClientTests
     /// <summary>
     ///     Reads frames until one matching the expected body case is found,
     ///     skipping interleaved heartbeats (the first heartbeat is emitted
-    ///     immediately on entering the heartbeat loop — see Worker-002).
+    ///     immediately on entering the heartbeat loop).
     /// </summary>
     private static async Task<WorkerEnvelope> ReadUntilAsync(
         WorkerFrameReader reader,