feat(worker): implement 6 MXAccess COM commands in executor

Wire up the previously-unimplemented Suspend, Activate, AuthenticateUser,
ArchestrAUserToId, AddBufferedItem, and SetBufferedUpdateInterval command
kinds in MxAccessCommandExecutor. These are real COM calls and run on the
STA via the executor.

- IMxAccessServer gains the 6 methods; MxAccessComServer routes them to the
  right interface version (Suspend/Activate -> ILMXProxyServer4 out MxStatus,
  AuthenticateUser -> base ILMXProxyServer, ArchestrAUserToId ->
  ILMXProxyServer2, AddBufferedItem/SetBufferedUpdateInterval ->
  ILMXProxyServer5).
- Suspend/Activate surface the native MxStatus, converted to MxStatusProxy
  via the existing MxStatusProxyConverter.
- AuthenticateUser hands the credential straight to MXAccess and never logs
  it; native HResult failures propagate via the dispatcher.
- MxAccessSession gains matching pass-throughs; AddBufferedItem registers
  the item handle in the handle registry.
- Unit tests (fake IMxAccessServer / fake COM object) cover each arm plus a
  password-non-leak assertion; existing IMxAccessServer fakes updated.

No proto changes (all request/reply messages already exist).

src/ZB.MOM.WW.MxGateway.Worker.Tests/TestSupport/NoopMxAccessServer.cs

@@ -1,3 +1,4 @@
+using ZB.MOM.WW.MxGateway.Worker.Conversion;
 using ZB.MOM.WW.MxGateway.Worker.MxAccess;
 
 namespace ZB.MOM.WW.MxGateway.Worker.Tests.TestSupport;
@@ -55,14 +56,10 @@ internal sealed class NoopMxAccessServer : IMxAccessServer
     }
 
     /// <inheritdoc />
-    public void Suspend(int serverHandle, int itemHandle)
-    {
-    }
+    public object Suspend(int serverHandle, int itemHandle) => new FakeMxStatus();
 
     /// <inheritdoc />
-    public void Activate(int serverHandle, int itemHandle)
-    {
-    }
+    public object Activate(int serverHandle, int itemHandle) => new FakeMxStatus();
 
     /// <inheritdoc />
     public void Write(int serverHandle, int itemHandle, object? value, int userId)
@@ -85,8 +82,29 @@ internal sealed class NoopMxAccessServer : IMxAccessServer
     }
 
     /// <inheritdoc />
-    public int AuthenticateUser(string userName, string password) => 0;
+    public int AuthenticateUser(int serverHandle, string verifyUser, string verifyUserPassword) => 0;
 
     /// <inheritdoc />
-    public int ArchestrAUserToId(string userName) => 0;
+    public int ArchestrAUserToId(int serverHandle, string userIdGuid) => 0;
+}
+
+/// <summary>
+/// Minimal stand-in for the native <c>ArchestrA.MxAccess.MxStatus</c> struct.
+/// <see cref="MxStatusProxyConverter"/> reflects over the public
+/// <c>success</c>, <c>category</c>, <c>detectedBy</c>, and <c>detail</c>
+/// fields, so this fake exposes the same field shape with all-OK values.
+/// </summary>
+internal sealed class FakeMxStatus
+{
+    /// <summary>Success indicator field read by the status converter.</summary>
+    public int success;
+
+    /// <summary>Status category field read by the status converter.</summary>
+    public int category;
+
+    /// <summary>Status detected-by field read by the status converter.</summary>
+    public int detectedBy;
+
+    /// <summary>Status detail field read by the status converter.</summary>
+    public int detail;
 }