Expand XML docs across bridge and test code

src/ZB.MOM.WW.LmxOpcUa.Host/Domain/ConnectionState.cs

@@ -5,11 +5,34 @@ namespace ZB.MOM.WW.LmxOpcUa.Host.Domain
     /// </summary>
     public enum ConnectionState
     {
+        /// <summary>
+        /// No active session exists to the Galaxy runtime.
+        /// </summary>
         Disconnected,
+
+        /// <summary>
+        /// The bridge is opening a new MXAccess session to the runtime.
+        /// </summary>
         Connecting,
+
+        /// <summary>
+        /// The bridge has an active MXAccess session and can service reads, writes, and subscriptions.
+        /// </summary>
         Connected,
+
+        /// <summary>
+        /// The bridge is closing the current MXAccess session and draining runtime resources.
+        /// </summary>
         Disconnecting,
+
+        /// <summary>
+        /// The bridge detected a connection fault that requires operator attention or recovery logic.
+        /// </summary>
         Error,
+
+        /// <summary>
+        /// The bridge is attempting to restore service after a runtime communication failure.
+        /// </summary>
         Reconnecting
     }
 }