feat(address-space): server-side array writes gated per driver capability (#610)

Array nodes were forced read-only for every driver. A new single authority,
Core.Abstractions DriverArrayWriteSupport, says which (driver, element type)
pairs encode a whole-array write: Modbus (Coils / numeric HoldingRegisters),
S7 (Byte/Int16/UInt16/Int32/UInt32/Float32), OpcUaClient (pass-through) and
Galaxy (Boolean/Int32/Int64/Float/Double/String/DateTime). Everything else
stays read-only, so the server never advertises a write the driver refuses.

- Composer derives RawTagPlan.ArrayWritable + UnsReferenceVariable
  .BackingArrayWritable at compose time (both seams, byte-parity); the
  applier's one writability rule is Writable && (!IsArray || ArrayWritable)
  for materialise and surgical paths, raw and UNS alike.
- ArrayWritable is on the classifier's surgical raw-tag whitelist and
  mirrored on the UNS record (UnsReferenceBackingParityTests updated).
- Node manager refuses a wrong-length / non-array value on an array node
  (BadTypeMismatch) and any IndexRange write (BadWriteNotSupported) inline,
  before dispatch; WriteOperate/ACL gates and the revert are unchanged.
- Per-driver parity tests pin the table against the real Modbus write path,
  S7 EncodeArrayBlock and Galaxy MxValueEncoder (UInt32/UInt64 excluded:
  array covariance reinterprets their bits).
- Over-the-wire proof in OpcUaServer.IntegrationTests (ArrayWriteWireTests).
- ValueRank > 1 documented as out of scope by decision (docs/Uns.md).

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Drivers/DeploymentArtifactRawUnsParityTests.cs

@@ -49,7 +49,7 @@ public sealed class DeploymentArtifactRawUnsParityTests
         var profile = new Tag
         {
             TagId = "tag-profile", DeviceId = "dev-1", TagGroupId = "grp-1", Name = "Profile", DataType = "Float",
-            AccessLevel = TagAccessLevel.Read, TagConfig = "{\"isArray\":true,\"arrayLength\":16}",
+            AccessLevel = TagAccessLevel.Read, TagConfig = "{\"region\":\"HoldingRegisters\",\"address\":100,\"dataType\":\"Float32\",\"isArray\":true,\"arrayLength\":16}",
         };
         var tempHi = new Tag
         {
@@ -82,7 +82,7 @@ public sealed class DeploymentArtifactRawUnsParityTests
             {
                 new { TagId = "tag-speed", DeviceId = "dev-1", TagGroupId = "grp-1", Name = "Speed", DataType = "Float", AccessLevel = 1, TagConfig = "{\"isHistorized\":true,\"historianTagname\":\"WW.Speed\"}" },
                 new { TagId = "tag-run", DeviceId = "dev-1", TagGroupId = (string?)null, Name = "Run", DataType = "Boolean", AccessLevel = 0, TagConfig = "{}" },
-                new { TagId = "tag-profile", DeviceId = "dev-1", TagGroupId = "grp-1", Name = "Profile", DataType = "Float", AccessLevel = 0, TagConfig = "{\"isArray\":true,\"arrayLength\":16}" },
+                new { TagId = "tag-profile", DeviceId = "dev-1", TagGroupId = "grp-1", Name = "Profile", DataType = "Float", AccessLevel = 0, TagConfig = "{\"region\":\"HoldingRegisters\",\"address\":100,\"dataType\":\"Float32\",\"isArray\":true,\"arrayLength\":16}" },
                 new { TagId = "tag-temphi", DeviceId = "dev-1", TagGroupId = (string?)null, Name = "TempHi", DataType = "Boolean", AccessLevel = 1, TagConfig = "{\"alarm\":{\"alarmType\":\"OffNormalAlarm\",\"severity\":700}}" },
             },
             UnsAreas = new[] { new { UnsAreaId = "a1", Name = "filling", ClusterId = "c1" } },
@@ -106,6 +106,7 @@ public sealed class DeploymentArtifactRawUnsParityTests
         var composedArray = composed.RawTags.Single(t => t.Name == "Profile");
         composedArray.IsArray.ShouldBeTrue();
         composedArray.ArrayLength.ShouldBe(16u);
+        composedArray.ArrayWritable.ShouldBeTrue(); // #610: a Modbus holding-register Float32 array is writable
         var composedAlarm = composed.RawTags.Single(t => t.Name == "TempHi");
         composedAlarm.Alarm.ShouldNotBeNull();
         composedAlarm.Alarm!.AlarmType.ShouldBe("OffNormalAlarm");
@@ -123,6 +124,7 @@ public sealed class DeploymentArtifactRawUnsParityTests
         var composedProfileRef = composed.UnsReferenceVariables.Single(v => v.UnsTagReferenceId == "ref-2");
         composedProfileRef.BackingIsArray.ShouldBeTrue();
         composedProfileRef.BackingArrayLength.ShouldBe(16u);
+        composedProfileRef.BackingArrayWritable.ShouldBeTrue();
         composedProfileRef.BackingIsHistorized.ShouldBeFalse();
 
         // Byte-parity: the three dual-namespace node sets are record-equal between the two seams.