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

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Mqtt.Browser/MqttBrowseSession.cs

@@ -441,16 +441,25 @@ internal sealed class MqttBrowseSession : IRebirthCapableBrowseSession
         var mapped = metric.DataType?.ToDriverDataType();
         var sparkplugName = metric.DataType?.ToString() ?? nameof(SparkplugDataType.Unknown);
 
+        var isArray = metric.DataType?.IsSparkplugArray() ?? false;
+
         var descriptor = new StringBuilder(metric.BirthType.ToString()).Append(" · ").Append(sparkplugName);
         if (metric.Alias is { } alias) descriptor.Append(" · alias ").Append(alias);
         if (mapped is null) descriptor.Append(" · unsupported in v1 — not bindable");
+        else if (isArray) descriptor.Append(" · array metrics are not read in v1 — not bindable");
+
+        // Unbindable = the ingestor refuses it: an unmapped type, or ANY array variant (SparkplugIngestor
+        // gates on the array bit and never feeds the tag). Such a leaf states NO address, so the
+        // browse-commit refuses it at commit instead of writing a tag that sits at
+        // BadWaitingForInitialData forever (R06:M-5). Labelling it alone was not enough — it still bound.
+        var bindable = mapped is not null && !isArray;
 
         return new AttributeInfo(
             metric.Name,
             mapped?.ToString() ?? sparkplugName,
-            metric.DataType?.IsSparkplugArray() ?? false,
+            isArray,
             descriptor.ToString(),
-            AddressFields: BuildMetricAddressFields(metric.Name, scope));
+            AddressFields: bindable ? BuildMetricAddressFields(metric.Name, scope) : null);
     }
 
     /// <summary>