fix(mqtt): Sparkplug array and unsupported-type metrics are not bindable from the browser (R06:M-5)

The ingestor refuses array metrics and unmapped types, yet DescribeMetric still stated
their binding tuple, so a browse-commit produced a tag stuck at
BadWaitingForInitialData forever. Those leaves now state no address (the commit
refuses them) and say why in the descriptor line.

Refs #744
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Mqtt.Tests/MqttBrowseSessionTests.cs

@@ -779,6 +779,13 @@ public sealed class MqttBrowseSessionTests
             "Plant1/EdgeA::Profile", TestContext.Current.CancellationToken)).ShouldHaveSingleItem();
         a.DriverDataType.ShouldBe(nameof(Core.Abstractions.DriverDataType.Int32));   // element type
         a.IsArray.ShouldBeTrue();
+
+        // R06:M-5: the ingestor refuses array metrics ("not supported in v1"), so the browser must not
+        // offer one as bindable — no stated address means the browse-commit refuses it in words, instead
+        // of committing a tag that sits at BadWaitingForInitialData forever. The scalar control is
+        // SparkplugAttributes_StateTheBindingTuple_SoTheCommitNeverParsesTheNodeId.
+        a.AddressFields.ShouldBeNull();
+        a.SecurityClass.ShouldContain("not bindable");
     }
 
     [Fact]
@@ -796,6 +803,7 @@ public sealed class MqttBrowseSessionTests
         Enum.TryParse<Core.Abstractions.DriverDataType>(a.DriverDataType, ignoreCase: true, out _)
             .ShouldBeFalse();                       // not a guessed type — unmappable, and visibly so
         a.SecurityClass.ShouldContain("unsupported");
+        a.AddressFields.ShouldBeNull();             // R06:M-5 — labelled AND unbindable, not just labelled
     }
 
     [Fact]