fix(driver-twincat): resolve Low code-review findings (Driver.TwinCAT-004,006,014,015,016)

- Driver.TwinCAT-004: corrected the IEC time-type inline comments;
  documented that the driver currently surfaces them as raw UInt32
  counters.
- Driver.TwinCAT-006: ResolveHost returns a documented UnresolvedHost
  sentinel when no devices are configured instead of returning the
  logical DriverInstanceId (which never matches GetHostStatuses).
- Driver.TwinCAT-014: wired Probe.Timeout into the probe-loop call and
  added a NotificationMaxDelayMs config knob threaded through
  AddNotificationAsync.
- Driver.TwinCAT-015: Dispose() runs a genuinely synchronous teardown
  with bounded waits (no sync-over-async deadlock pattern).
- Driver.TwinCAT-016: pinned the Structure-tag rejection and the
  probe-loop vs read disposal race with regression tests.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT/TwinCATDriverFactoryExtensions.cs

@@ -60,9 +60,19 @@ public static class TwinCATDriverFactoryExtensions
             Timeout = TimeSpan.FromMilliseconds(dto.TimeoutMs ?? 2_000),
             UseNativeNotifications = dto.UseNativeNotifications ?? true,
             EnableControllerBrowse = dto.EnableControllerBrowse ?? false,
+            NotificationMaxDelayMs = dto.NotificationMaxDelayMs ?? 0,
         };
     }
 
+    /// <summary>
+    ///     Test-visible wrapper around <see cref="ParseOptions"/> for the regression suite —
+    ///     keeps the public driver surface unchanged while letting tests assert that JSON
+    ///     fields like <c>NotificationMaxDelayMs</c> and <c>Structure</c>-tag rejection are
+    ///     honored end-to-end.
+    /// </summary>
+    public static TwinCATDriverOptions ParseOptionsForTests(string driverConfigJson, string driverInstanceId)
+        => ParseOptions(driverConfigJson, driverInstanceId);
+
     private static TwinCATTagDefinition BuildTag(TwinCATTagDto t, string driverInstanceId)
     {
         var dataType = ParseEnum<TwinCATDataType>(t.DataType, t.Name, driverInstanceId, "DataType");
@@ -117,6 +127,7 @@ public static class TwinCATDriverFactoryExtensions
         public int? TimeoutMs { get; init; }
         public bool? UseNativeNotifications { get; init; }
         public bool? EnableControllerBrowse { get; init; }
+        public int? NotificationMaxDelayMs { get; init; }
         public List<TwinCATDeviceDto>? Devices { get; init; }
         public List<TwinCATTagDto>? Tags { get; init; }
         public TwinCATProbeDto? Probe { get; init; }