feat(v3-batch4-wp2): node manager dual-namespace + realm-aware sink surface

Register both v3 namespaces (Raw first, UNS second) on OtOpcUaNodeManager and
thread an AddressSpaceRealm discriminator through every node-naming sink method
so a bare node id is resolved to the correct namespace by realm — never parsed
out of the id string.

- IOpcUaAddressSpaceSink / ISurgicalAddressSpaceSink: every node-naming method
  gains `AddressSpaceRealm realm = AddressSpaceRealm.Uns` (transitional default so
  un-migrated WP3 call sites still compile; WP3/Wave B makes them explicit and
  removes the default). Null + SdkAddressSpaceSink impls updated; DeferredAddress-
  SpaceSink forwards realm through every method (the forwarding trap).
- DeferredSinkForwardingReflectionTests: existing exhaustive-forwarding guard
  auto-covers the new signatures; added an explicit guard that every node-naming
  sink method carries an AddressSpaceRealm parameter (RebuildAddressSpace exempt).
- OtOpcUaNodeManager: register RawNamespaceUri + UnsNamespaceUri; realm->namespace
  index via NamespaceIndexForRealm; all node maps (_variables/_folders/
  _alarmConditions/_nativeAlarmNodeIds/_historizedTagnames/_eventNotifierSources)
  re-keyed by the full ns-qualified NodeId string so Raw and UNS nodes sharing a
  bare id stay distinct; _notifierFolders already NodeId-keyed. A historized UNS
  reference node registers the SAME historian tagname as its backing raw node
  (both NodeIds -> one tagname). Inbound-write hook routes the full ns-qualified
  NodeId to the write gateway (realm-aware) and reverts by bare id + realm.
  HistoryRead seams resolve via NodeId directly. DefaultNamespaceUri kept as a
  transitional alias to UnsNamespaceUri for the SubscriptionSurvivalTests.
- Test doubles across Commons.Tests / OpcUaServer.Tests / Runtime.Tests updated to
  the new interface signatures; SdkAddressSpaceSinkTests asserts the UNS namespace
  index for default-realm nodes.

Build: dotnet build ZB.MOM.WW.OtOpcUa.slnx = 0 errors.
Tests: Commons.Tests 310/310; OpcUaServer.Tests 335 passed / 4 pre-existing skips.

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

tests/Core/ZB.MOM.WW.OtOpcUa.Commons.Tests/OpcUa/DeferredSinkForwardingReflectionTests.cs

@@ -74,6 +74,24 @@ public class DeferredSinkForwardingReflectionTests
         }
     }
 
+    [Fact]
+    public void Every_node_naming_sink_method_carries_a_realm_discriminator()
+    {
+        // v3 B4-WP2 dual-namespace invariant: a node id alone is no longer globally unique across the two
+        // namespaces (Raw vs UNS), so every sink method that NAMES a node must carry an AddressSpaceRealm
+        // discriminator — the sink resolves the namespace from the realm rather than parsing the id string.
+        // RebuildAddressSpace is the sole node-naming-free method (it clears BOTH realms). This guard locks in
+        // the realm surface so a future method can't be added that names a node without a realm.
+        foreach (var method in ForwardingInterfaces.SelectMany(i => i.GetMethods()))
+        {
+            if (method.Name == nameof(IOpcUaAddressSpaceSink.RebuildAddressSpace)) continue;
+
+            method.GetParameters().Any(p => p.ParameterType == typeof(AddressSpaceRealm)).ShouldBeTrue(
+                $"{method.DeclaringType!.Name}.{method.Name} names a node but has no AddressSpaceRealm parameter — " +
+                "a bare node id is ambiguous across the Raw and UNS namespaces (B4-WP2). Add the realm discriminator.");
+        }
+    }
+
     [Fact]
     public void Every_IServiceLevelPublisher_method_reaches_the_inner_publisher()
     {