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/Sta/StaComApartmentInitializer.cs

@@ -9,7 +9,7 @@ public sealed class StaComApartmentInitializer : IStaComApartmentInitializer
     private const int SOk = 0;
     private const int SFalse = 1;
 
-    /// <summary>Initializes the COM apartment in single-threaded mode.</summary>
+    /// <inheritdoc />
     public void Initialize()
     {
         int hresult = CoInitializeEx(IntPtr.Zero, CoInitializeApartmentThreaded);
@@ -19,7 +19,7 @@ public sealed class StaComApartmentInitializer : IStaComApartmentInitializer
         }
     }
 
-    /// <summary>Uninitializes the COM apartment.</summary>
+    /// <inheritdoc />
     public void Uninitialize()
     {
         CoUninitialize();

src/ZB.MOM.WW.MxGateway.Worker/Sta/StaMessagePump.cs

@@ -43,6 +43,7 @@ public sealed class StaMessagePump
     }
 
     /// <summary>Pumps and dispatches all pending Windows messages, returning the count processed.</summary>
+    /// <returns>The number of messages pumped and dispatched.</returns>
     public int PumpPendingMessages()
     {
         int pumpedMessages = 0;

src/ZB.MOM.WW.MxGateway.Worker/Sta/StaRuntime.cs

@@ -86,6 +86,7 @@ public sealed class StaRuntime : IDisposable
     ///     wait. Callers must already be on the STA; the method is otherwise
     ///     safe (PeekMessage simply finds no messages).
     /// </summary>
+    /// <returns>The number of messages pumped.</returns>
     public int PumpPendingMessages() => messagePump.PumpPendingMessages();
 
     /// <summary>
@@ -212,9 +213,7 @@ public sealed class StaRuntime : IDisposable
         return stopped;
     }
 
-    /// <summary>
-    /// Releases resources used by the STA runtime.
-    /// </summary>
+    /// <inheritdoc />
     public void Dispose()
     {
         if (disposed)

src/ZB.MOM.WW.MxGateway.Worker/Sta/StaWorkItem.cs

@@ -41,7 +41,7 @@ internal sealed class StaWorkItem<T> : IStaWorkItem
 
     private TaskCompletionSource<T> Completion { get; }
 
-    /// <summary>Cancels the work item before execution begins.</summary>
+    /// <inheritdoc />
     public void CancelBeforeExecution()
     {
         if (Interlocked.CompareExchange(ref started, 1, 0) == 0)
@@ -51,7 +51,7 @@ internal sealed class StaWorkItem<T> : IStaWorkItem
         }
     }
 
-    /// <summary>Executes the work item command.</summary>
+    /// <inheritdoc />
     public void Execute()
     {
         if (Interlocked.CompareExchange(ref started, 1, 0) != 0)