Expand XML docs across bridge and test code

tests/ZB.MOM.WW.LmxOpcUa.Tests/GalaxyRepository/ChangeDetectionServiceTests.cs

@@ -8,8 +8,14 @@ using ZB.MOM.WW.LmxOpcUa.Tests.Helpers;
 
 namespace ZB.MOM.WW.LmxOpcUa.Tests.GalaxyRepository
 {
+    /// <summary>
+    /// Verifies the polling service that detects Galaxy deploy changes and triggers address-space rebuilds.
+    /// </summary>
     public class ChangeDetectionServiceTests
     {
+        /// <summary>
+        /// Confirms that the first poll always triggers an initial rebuild notification.
+        /// </summary>
         [Fact]
         public async Task FirstPoll_AlwaysTriggers()
         {
@@ -26,6 +32,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.GalaxyRepository
             service.Dispose();
         }
 
+        /// <summary>
+        /// Confirms that repeated polls with the same deploy timestamp do not retrigger rebuilds.
+        /// </summary>
         [Fact]
         public async Task SameTimestamp_DoesNotTriggerAgain()
         {
@@ -42,6 +51,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.GalaxyRepository
             service.Dispose();
         }
 
+        /// <summary>
+        /// Confirms that a changed deploy timestamp triggers another rebuild notification.
+        /// </summary>
         [Fact]
         public async Task ChangedTimestamp_TriggersAgain()
         {
@@ -62,6 +74,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.GalaxyRepository
             service.Dispose();
         }
 
+        /// <summary>
+        /// Confirms that transient polling failures do not crash the service and allow later recovery.
+        /// </summary>
         [Fact]
         public async Task FailedPoll_DoesNotCrash_RetriesNext()
         {
@@ -88,6 +103,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.GalaxyRepository
             service.Dispose();
         }
 
+        /// <summary>
+        /// Confirms that stopping the service before it starts is a harmless no-op.
+        /// </summary>
         [Fact]
         public void Stop_BeforeStart_DoesNotThrow()
         {