Expand XML docs across bridge and test code

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

@@ -14,6 +14,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.Wiring
     /// </summary>
     public class ServiceStartupSequenceTest
     {
+        /// <summary>
+        /// Confirms that startup with fake dependencies creates the expected bridge components and state.
+        /// </summary>
         [Fact]
         public void Start_WithFakes_AllComponentsCreated()
         {
@@ -71,6 +74,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.Wiring
             }
         }
 
+        /// <summary>
+        /// Confirms that when MXAccess is initially unavailable, the background monitor reconnects it later.
+        /// </summary>
         [Fact]
         public async Task Start_WhenMxAccessIsInitiallyDown_MonitorReconnectsInBackground()
         {