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.Runtime.Tests/Drivers/DriverHostActorDiscoveryTests.cs

@@ -238,10 +238,10 @@ public sealed class DriverHostActorDiscoveryTests : RuntimeActorTestBase
         // collapse regression — which would re-introduce the host folder (e.g. EQ-A/FOCAS/H1/Identity/Model) —
         // fails here. Belt-and-suspenders: the raw discovered "H1" segment is also checked case-SENSITIVELY
         // (a lowercase-only "h1" check would miss a leaked raw "H1").
-        eqANodeId.ShouldBe(EquipmentNodeIds.Variable("EQ-A", "FOCAS/Identity", "Model"));
+        eqANodeId.ShouldBe(V3NodeIds.Uns("EQ-A", "FOCAS", "Identity", "Model"));
         eqANodeId.ShouldNotContain("H1");
         eqANodeId.ShouldNotContain("h1");
-        eqBNodeId.ShouldBe(EquipmentNodeIds.Variable("EQ-B", "FOCAS/Status", "Run"));
+        eqBNodeId.ShouldBe(V3NodeIds.Uns("EQ-B", "FOCAS", "Status", "Run"));
         eqBNodeId.ShouldNotContain("h2");
 
         // (b) The driver subscribes the UNION of both devices' FixedTree refs (tag-less ⇒ no authored refs).