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End-to-end data path is now wired on the read side: driver subscriptions
fire AttributeValuePublished → DriverHostActor → DependencyMuxActor →
DependencyValueChanged to every interested VirtualTagActor. Previously
the publish hit a dead-letter at the host.
DependencyMuxActor:
- Per-node fan-out router. Maintains tagRef → Set<IActorRef> with a
reverse subscriber → refs index so unregister/replace are O(refs).
- Watches subscribers; Terminated triggers automatic unregister so
dead virtual-tag actors stop receiving publishes.
- Re-register replaces the prior interest set — no stale-ref leaks
on actor restart.
- Drops publishes for refs with no interested subscribers.
VirtualTagActor:
- New Props params: dependencyRefs + mux ActorRef.
- PreStart sends RegisterInterest to the mux; PostStop sends
UnregisterInterest. Default both null so older callers stay quiet.
DriverHostActor:
- New dependencyMux Props param. Steady + Applying states now
receive AttributeValuePublished from their DriverInstance children
and forward to the mux. Null mux is a no-op (dev/Mac).
ServiceCollectionExtensions:
- WithOtOpcUaRuntimeActors spawns DependencyMuxActor before
DriverHostActor and threads its ActorRef into the host's Props.
New DependencyMuxActorKey + DependencyMuxActorName.
Tests: Runtime 57 -> 63 (+6):
- Mux forwards to only subscribers interested in each ref
- Publish for unregistered ref is dropped silently
- Unregister stops forwarding
- Re-register replaces prior interest set
- VirtualTagActor PreStart registration drives end-to-end eval
(uses AwaitAssert to race-safely settle the PreStart Tell)
- DriverHostActor forwards AttributeValuePublished through to mux
All 6 v2 test suites green: 163 tests passing.
F8 (#79) state updated — dep subscribe seam shipped, Core.VirtualTags
production engine binding (compile + ITagUpstreamSource subscribe) is
the residual.