feat(v3-batch4-wp3): raw-only binding + UNS fan-out + write routing

Wave B of Batch 4 — the runtime binding seam for the dual namespace.

Applier (both realms, explicit realm at every sink call site):
- MaterialiseRawSubtree: Raw containers as folders + Raw tags as variables
  keyed by RawPath (native-alarm tag → single Part 9 condition at the RawPath),
  all in AddressSpaceRealm.Raw; historian tagname = override else RawPath.
- MaterialiseUnsReferences: each UNS reference Variable under its equipment
  folder (Uns realm) + an Organizes UNS->Raw edge; inherits writable/array/
  historian tagname from the backing raw tag (both NodeIds -> one tagname).
- FeedHistorizedRefs / ProvisionHistorizedTags now source RAW tags (mux ref
  stays single, keyed by RawPath); ApplyPureRemove tears down raw tags + UNS
  refs in place (raw-container removal falls back to rebuild).

DriverHostActor (dual-NodeId, single-source fan-out):
- _nodeIdByDriverRef value gains a realm (NodeRealmRef); rebuilt from
  RawTags UNION UnsReferenceVariables so one (DriverInstanceId, RawPath) fans
  to the raw NodeId AND every referencing UNS NodeId with identical
  value/quality/timestamp. Write inverse map keyed by the bare id; the
  ns-qualified NodeId the write hook passes is normalised (BareNodeId) so a
  write to either NodeId resolves the same driver ref (-> RawPath write).
- Native raw alarm condition routing is realm-tagged (Raw); AttributeValueUpdate
  + AlarmStateUpdate carry the realm through to the sink.

Retire EquipmentNodeIds -> V3NodeIds.Uns (applier/VirtualTagHostActor) and
RawPaths.Combine (DiscoveredNodeMapper, discovered nodes are Raw now).

DeploymentArtifact.ParseComposition emits the Raw + UNS subtrees byte-parity
with the composer (reconstruct entities -> AddressSpaceComposer.Compose).

Sink surface: removed the transitional `= AddressSpaceRealm.Uns` defaults from
IOpcUaAddressSpaceSink / ISurgicalAddressSpaceSink / SdkAddressSpaceSink /
DeferredAddressSpaceSink / NullOpcUaAddressSpaceSink — every call site is now
explicit (realm reordered before the trailing optionals on EnsureVariable +
MaterialiseAlarmCondition). Node-manager convenience methods keep their
defaults (they are not the interface impl; Sdk delegates explicitly).

Tests: rewrote DriverHostActorLiveValueTests (fan-out drift, 1:N) +
DriverHostActorWriteRoutingTests (dual-NodeId raw/uns write routing) to the v3
raw+uns model; new AddressSpaceApplierRawUnsTests; migrated the EquipmentTags
provisioning/feed tests to RawTags; swept EquipmentNodeIds test callers.

Claude-Session: https://claude.ai/code/session_01LVneM3eh1UtJxEisFXgmox

tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/AddressSpaceApplierProvisioningTests.cs

@@ -292,8 +292,8 @@ public sealed class AddressSpaceApplierProvisioningTests
             RemovedAlarms: Array.Empty<ScriptedAlarmPlan>(),
             ChangedAlarms: Array.Empty<AddressSpacePlan.AlarmDelta>())
         {
-            RemovedEquipmentTags = new[] { removedTag },
-            ChangedEquipmentTags = new[] { new AddressSpacePlan.EquipmentTagDelta(prev, cur) },
+            RemovedRawTags = new[] { removedTag },
+            ChangedRawTags = new[] { new AddressSpacePlan.RawTagDelta(prev, cur) },
         };
 
         applier.Apply(plan);
@@ -324,15 +324,20 @@ public sealed class AddressSpaceApplierProvisioningTests
         outcome.RebuildCalled.ShouldBeFalse(); // PureAdd — no rebuild; Apply still completed + provisioned
     }
 
-    private static EquipmentTagPlan HistorizedTag(string displayName, string? historianName, string dataType, string fullName = "ref")
-        => new("tag-" + displayName, "eq-1", "drv", FolderPath: "", Name: displayName, DataType: dataType, FullName: fullName,
-            Writable: false, Alarm: null, IsHistorized: true, HistorianTagname: historianName);
+    // v3 Batch 4: historized value tags are RAW tags — the mux ref + historian default are the RawPath
+    // (== NodeId). The `fullName` param plays the role of the RawPath here (kept as a param name so the
+    // existing assertions — HistorizedTagRef("ref"/"40001", …) — read unchanged).
+    private static RawTagPlan HistorizedTag(string displayName, string? historianName, string dataType, string fullName = "ref")
+        => new("tag-" + displayName, NodeId: fullName, ParentNodeId: null, DriverInstanceId: "drv", Name: displayName,
+            DataType: dataType, Writable: false, Alarm: null, ReferencingEquipmentPaths: Array.Empty<string>(),
+            IsHistorized: true, HistorianTagname: historianName);
 
-    private static EquipmentTagPlan NonHistorizedTag(string displayName, string dataType)
-        => new("tag-" + displayName, "eq-1", "drv", FolderPath: "", Name: displayName, DataType: dataType, FullName: "ref",
-            Writable: false, Alarm: null, IsHistorized: false, HistorianTagname: null);
+    private static RawTagPlan NonHistorizedTag(string displayName, string dataType)
+        => new("tag-" + displayName, NodeId: "ref", ParentNodeId: null, DriverInstanceId: "drv", Name: displayName,
+            DataType: dataType, Writable: false, Alarm: null, ReferencingEquipmentPaths: Array.Empty<string>(),
+            IsHistorized: false, HistorianTagname: null);
 
-    private static AddressSpacePlan PlanWithAddedTags(params EquipmentTagPlan[] tags) => new(
+    private static AddressSpacePlan PlanWithAddedTags(params RawTagPlan[] tags) => new(
         AddedEquipment: Array.Empty<EquipmentNode>(),
         RemovedEquipment: Array.Empty<EquipmentNode>(),
         ChangedEquipment: Array.Empty<AddressSpacePlan.EquipmentDelta>(),
@@ -343,6 +348,6 @@ public sealed class AddressSpaceApplierProvisioningTests
         RemovedAlarms: Array.Empty<ScriptedAlarmPlan>(),
         ChangedAlarms: Array.Empty<AddressSpacePlan.AlarmDelta>())
     {
-        AddedEquipmentTags = tags,
+        AddedRawTags = tags,
     };
 }