feat(mqtt): read Sparkplug B array metrics as 1-D OPC UA arrays (lmxopcua#754)

R06:M-5 made Sparkplug *Array leaves unbindable because the ingestor refused
them. The ingestor now decodes the packed bytes_value of all 13 array types
(new SparkplugArrayCodec: LE fixed widths, int64-ms DateTime, uint32-count +
MSB-first BooleanArray, NUL-terminated UTF-8 StringArray; golden vectors are
the spec's examples, reproduced byte-for-byte by SparkplugNet 1.3.10) and
publishes a typed 1-D array through the scalar coercion, all-or-nothing.

Shape uses the fleet's one array model: the tag's platform isArray/arrayLength
keys (ValueRank=1, ArrayDimensions=[arrayLength] or [0] = variable length).
The driver reads them with TagConfigIntent's exact semantics and never rejects
on them, so composer, driver, authoring model and deploy inspector agree
(MqttArrayShapeParityTests). Shape mismatch (array metric on a scalar tag, or
the reverse) is BadTypeMismatch - a String tag no longer gets the packed
buffer as base64; a malformed body or a length differing from a declared
arrayLength is BadDecodingError (MTConnect #627 verdict). Template/DataSet
members of an array type take the same path. Arrays stay read-only (encoder
refuses them; MQTT is not in DriverArrayWriteSupport).

Browser: array leaves are bindable again and state isArray in AddressFields;
the commit mapper writes "isArray": true (no arrayLength). Discovery reports
IsArray/ArrayDim. Docs: Mqtt.md "Array metrics", design table, drivers rule.

Tests: codec (golden + malformed), ingest through the real codec + Dispatch
(the project's MiniBroker never forwards a PUBLISH, so there is no in-process
broker harness), browse, discovery, commit mapper, parity corpus. Mutating the
fix back out fails 18 MQTT + 9 AdminUI tests.

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/RawBrowseCommitMapper.cs

@@ -351,6 +351,12 @@ public static class RawBrowseCommitMapper
             if (TryGetField(addressFields, MqttTagConfigKeys.DeviceId) is { } deviceId)
                 o[MqttTagConfigKeys.DeviceId] = deviceId;
 
+            // A Sparkplug *Array metric binds only to an ARRAY tag (#754): the session states the bit, and it
+            // is written as the JSON literal true — the only form the composer and the driver both read as an
+            // array. No arrayLength: a Sparkplug array is variable-length, so the node is ArrayDimensions=[0].
+            if (string.Equals(TryGetField(addressFields, MqttTagConfigKeys.IsArray), "true", StringComparison.OrdinalIgnoreCase))
+                o[MqttTagConfigKeys.IsArray] = true;
+
             return o.ToJsonString();
         }
 
@@ -422,12 +428,12 @@ public static class RawBrowseCommitMapper
         if (TryGetField(addressFields, MqttTagConfigKeys.Topic) is not null) return null;
 
         // G2-F2: the Sparkplug browser deliberately states no address for a metric the ingestor will not
-        // read (an *Array type, or a type with no driver mapping — R06:M-5), and says so on its descriptor
+        // read (a type with no driver mapping — R06:M-5; *Array types are read since #754), and says so on its descriptor
         // line. That is a "not bindable in this version" refusal, not a failed lookup, so say which.
         if (descriptor is not null && descriptor.Contains(NotBindableMarker, StringComparison.OrdinalIgnoreCase))
         {
             return $"'{browseName}' cannot be bound in this version: the Sparkplug browser reports it as "
-                 + $"\"{descriptor}\". Array metrics and metrics of an unsupported type are not read yet; "
+                 + $"\"{descriptor}\". Metrics of an unsupported type are not read yet; "
                  + "remove it from the selection.";
         }