Expand XML docs across bridge and test code

tests/ZB.MOM.WW.LmxOpcUa.Tests/Wiring/MxAccessToNodeManagerWiringTest.cs

@@ -12,6 +12,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.Wiring
     /// </summary>
     public class MxAccessToNodeManagerWiringTest
     {
+        /// <summary>
+        /// Confirms that a simulated data change reaches the global tag-value-changed event.
+        /// </summary>
         [Fact]
         public async Task DataChange_ReachesGlobalHandler()
         {
@@ -33,6 +36,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.Wiring
             receivedVtq.Value.Quality.ShouldBe(Quality.Good);
         }
 
+        /// <summary>
+        /// Confirms that a simulated data change reaches the stored per-tag subscription callback.
+        /// </summary>
         [Fact]
         public async Task DataChange_ReachesSubscriptionCallback()
         {