fix(runtime): the native-alarm projector learns a routed client acknowledgement (#641 review)

#641 keeps the projector's prior state across a deploy instead of resetting it to the
acked default. The projector never saw a client's ack (the SDK applies it to the node and
the host only routes it), so a Clear after ack+deploy now projected Acked=false and
un-acknowledged the operator's ack - previously masked by the per-deploy reset.

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

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Drivers/DriverHostActor.cs

@@ -2018,6 +2018,12 @@ public sealed class DriverHostActor : ReceiveActor, IWithTimers, IWithUnboundedS
             return;
         }
 
+        // Gitea #641 review — the node is already acknowledged (the SDK applies the client's ack); tell the
+        // projector too, or the next driver Clear projects (Active=false, Acked=prev=false) and un-acknowledges it.
+        // Most sources (MTConnect, FOCAS) send no Acknowledge transition back, and the projector now survives a
+        // deploy rather than resetting to its acked default.
+        _nativeAlarmProjector.MarkAcknowledged(msg.ConditionNodeId);
+
         if (!_children.TryGetValue(target.DriverInstanceId, out var entry))
         {
             _log.Debug("DriverHost {Node}: driver {Driver} not running for alarm ack of {Cond} — dropped",

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Drivers/NativeAlarmProjector.cs

@@ -40,6 +40,17 @@ public sealed class NativeAlarmProjector
             StatusCode: e.QualityStatusCode ?? OpcUaStatus.Good);
     }
 
+    /// <summary>
+    ///     Gitea #641 review — record a client acknowledgement the node manager applied to <paramref name="nodeId"/>
+    ///     and routed toward the driver. The projector otherwise never sees it, and a later Clear would project the
+    ///     stale unacknowledged prior. An untracked condition already defaults to acknowledged.
+    /// </summary>
+    /// <param name="nodeId">The acknowledged condition node id.</param>
+    public void MarkAcknowledged(string nodeId)
+    {
+        if (_prior.TryGetValue(nodeId, out var p)) _prior[nodeId] = (p.Active, true);
+    }
+
     /// <summary>Clears all tracked per-node state.</summary>
     public void Clear() => _prior.Clear();