feat(alarms): thread isNative through MaterialiseAlarmCondition; node manager tracks native conditions [H6a]

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

@@ -323,6 +323,37 @@ public sealed class AlarmCommandRouterTests : IDisposable
         await host.DisposeAsync();
     }
 
+    /// <summary>H6a — a condition materialised with <c>isNative:true</c> is tracked so later inbound-ack
+    /// routing can dispatch its Acknowledge to the driver rather than the scripted engine.</summary>
+    [Fact]
+    public async Task Native_materialise_is_tracked_as_native()
+    {
+        var (host, server) = await BootAsync();
+        var nm = server.NodeManager!;
+
+        nm.EnsureFolder("eq", parentNodeId: null, displayName: "Equipment");
+        nm.MaterialiseAlarmCondition("a1", "eq", "d", "OffNormalAlarm", 700, isNative: true);
+
+        nm.IsNativeAlarmNode("a1").ShouldBeTrue();
+
+        await host.DisposeAsync();
+    }
+
+    /// <summary>H6a — a scripted condition (the default, <c>isNative:false</c>) is NOT tracked as native.</summary>
+    [Fact]
+    public async Task Scripted_materialise_is_not_native()
+    {
+        var (host, server) = await BootAsync();
+        var nm = server.NodeManager!;
+
+        nm.EnsureFolder("eq", parentNodeId: null, displayName: "Equipment");
+        nm.MaterialiseAlarmCondition("a2", "eq", "d", "OffNormalAlarm", 700, isNative: false);
+
+        nm.IsNativeAlarmNode("a2").ShouldBeFalse();
+
+        await host.DisposeAsync();
+    }
+
     /// <summary>Builds a <see cref="ServerSystemContext"/> (an <see cref="ISessionOperationContext"/>)
     /// carrying a <see cref="RoleCarryingUserIdentity"/> with the given name + roles — the exact seam the
     /// gate reads via <c>(context as ISessionOperationContext)?.UserIdentity as RoleCarryingUserIdentity</c>.</summary>