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/WorkerApplication.cs

@@ -11,6 +11,7 @@ public static class WorkerApplication
 {
     /// <summary>Initializes and runs the worker with default environment and logging.</summary>
     /// <param name="args">Command-line arguments.</param>
+    /// <returns>The process exit code.</returns>
     public static int Run(string[] args)
     {
         return Run(
@@ -23,6 +24,7 @@ public static class WorkerApplication
     /// <param name="args">Command-line arguments.</param>
     /// <param name="environment">Worker environment for resolving configuration.</param>
     /// <param name="logger">Worker logger for diagnostics.</param>
+    /// <returns>The process exit code.</returns>
     public static int Run(
         string[] args,
         IWorkerEnvironment environment,
@@ -40,6 +42,7 @@ public static class WorkerApplication
     /// <param name="environment">Worker environment for resolving configuration.</param>
     /// <param name="logger">Worker logger for diagnostics.</param>
     /// <param name="pipeClient">Named pipe client for gateway communication.</param>
+    /// <returns>The process exit code.</returns>
     public static int Run(
         string[] args,
         IWorkerEnvironment environment,