fix(ablegacy): dispose per-parent RMW locks on teardown (review symmetry)

DisposeRuntimes() now disposes and clears _rmwLocks, _creationLocks, and
_runtimeLocks so ReinitializeAsync/ShutdownAsync cycles don't orphan their
SemaphoreSlim instances. Mirrors the TwinCAT _bitRmwLocks fix already shipped.

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy/AbLegacyDriver.cs

@@ -928,6 +928,15 @@ public sealed class AbLegacyDriver : IDriver, IReadable, IWritable, ITagDiscover
             Runtimes.Clear();
             foreach (var r in ParentRuntimes.Values) r.Dispose();
             ParentRuntimes.Clear();
+            // Dispose + clear the per-parent RMW gates and the per-runtime/creation locks so
+            // ReinitializeAsync cycles don't orphan their SemaphoreSlim instances (each leaks a
+            // wait handle once contended).
+            foreach (var sem in _rmwLocks.Values) sem.Dispose();
+            _rmwLocks.Clear();
+            foreach (var sem in _creationLocks.Values) sem.Dispose();
+            _creationLocks.Clear();
+            foreach (var sem in _runtimeLocks.Values) sem.Dispose();
+            _runtimeLocks.Clear();
         }
     }
 }