test(cli): assert Enable/Disable object node + add suffix-idempotency test

Closes the code-review gap: the Enable/Disable success tests now assert the
derived '.Condition' object node (the CallMethodObjectIds capture was added
but unused), and a new test proves an already-suffixed condition node isn't
double-suffixed (mirrors AcknowledgeAlarmAsync_LeavesConditionSuffixAlone).

tests/Client/ZB.MOM.WW.OtOpcUa.Client.Shared.Tests/OpcUaClientServiceTests.cs

@@ -1191,6 +1191,7 @@ public class OpcUaClientServiceTests : IDisposable
 
         result.ShouldBe(StatusCodes.Good);
         session.CallMethodCount.ShouldBe(1);
+        session.CallMethodObjectIds[0].ShouldBe(NodeId.Parse("ns=2;s=Cond.Condition"));
         session.CallMethodMethodIds[0].ShouldBe(MethodIds.ConditionType_Enable);
         session.CallMethodInputArgs[0].ShouldBeEmpty();
     }
@@ -1210,10 +1211,31 @@ public class OpcUaClientServiceTests : IDisposable
 
         result.ShouldBe(StatusCodes.Good);
         session.CallMethodCount.ShouldBe(1);
+        session.CallMethodObjectIds[0].ShouldBe(NodeId.Parse("ns=2;s=Cond.Condition"));
         session.CallMethodMethodIds[0].ShouldBe(MethodIds.ConditionType_Disable);
         session.CallMethodInputArgs[0].ShouldBeEmpty();
     }
 
+    /// <summary>
+    /// Verifies the ".Condition" suffix is appended when the caller supplies the source node,
+    /// but left alone when the caller already passes the condition node — mirrors
+    /// <see cref="AcknowledgeAlarmAsync_LeavesConditionSuffixAlone"/> for the Enable path so the
+    /// object-node derivation in CallEnableDisableAsync is regression-covered.
+    /// </summary>
+    [Fact]
+    public async Task EnableAsync_WhenConditionSuffixAlreadyPresent_DoesNotDoubleSuffix()
+    {
+        var session = new FakeSessionAdapter();
+        _sessionFactory.EnqueueSession(session);
+        await _service.ConnectAsync(ValidSettings());
+
+        var result = await _service.EnableAsync("ns=2;s=Cond.Condition");
+
+        result.ShouldBe(StatusCodes.Good);
+        session.CallMethodCount.ShouldBe(1);
+        session.CallMethodObjectIds[0].ShouldBe(NodeId.Parse("ns=2;s=Cond.Condition"));
+    }
+
     /// <summary>
     /// Verifies that a <see cref="ServiceResultException"/> from the session is captured and
     /// returned as a bad <see cref="StatusCode"/> rather than propagating to the caller.