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>

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Tests/TwinCATNativeNotificationTests.cs

@@ -137,12 +137,12 @@ public sealed class TwinCATNativeNotificationTests
 
         public override Task<ITwinCATNotificationHandle> AddNotificationAsync(
             string symbolPath, TwinCATDataType type, int? bitIndex, TimeSpan cycleTime,
-            Action<string, object?> onChange, CancellationToken cancellationToken)
+            int maxDelayMs, Action<string, object?> onChange, CancellationToken cancellationToken)
         {
             AddCallCount++;
             if (AddCallCount > _succeedBefore)
                 throw new InvalidOperationException($"fake fail on call #{AddCallCount}");
-            return base.AddNotificationAsync(symbolPath, type, bitIndex, cycleTime, onChange, cancellationToken);
+            return base.AddNotificationAsync(symbolPath, type, bitIndex, cycleTime, maxDelayMs, onChange, cancellationToken);
         }
     }