Expand XML docs across bridge and test code

src/ZB.MOM.WW.LmxOpcUa.Host/MxAccess/MxAccessClient.cs

@@ -49,13 +49,38 @@ namespace ZB.MOM.WW.LmxOpcUa.Host.MxAccess
         private DateTime _lastProbeValueTime = DateTime.UtcNow;
         private int _reconnectCount;
 
+        /// <summary>
+        /// Gets the current runtime connection state for the MXAccess client.
+        /// </summary>
         public ConnectionState State => _state;
+
+        /// <summary>
+        /// Gets the number of active tag subscriptions currently maintained against the runtime.
+        /// </summary>
         public int ActiveSubscriptionCount => _storedSubscriptions.Count;
+
+        /// <summary>
+        /// Gets the number of reconnect attempts performed since the client was created.
+        /// </summary>
         public int ReconnectCount => _reconnectCount;
 
+        /// <summary>
+        /// Occurs when the MXAccess connection state changes.
+        /// </summary>
         public event EventHandler<ConnectionStateChangedEventArgs>? ConnectionStateChanged;
+
+        /// <summary>
+        /// Occurs when a subscribed runtime tag publishes a new value.
+        /// </summary>
         public event Action<string, Vtq>? OnTagValueChanged;
 
+        /// <summary>
+        /// Initializes a new MXAccess client around the STA thread, COM proxy abstraction, and runtime throttling settings.
+        /// </summary>
+        /// <param name="staThread">The STA thread used to marshal COM interactions.</param>
+        /// <param name="proxy">The COM proxy abstraction used to talk to the runtime.</param>
+        /// <param name="config">The runtime timeout, throttling, and reconnect settings.</param>
+        /// <param name="metrics">The metrics collector used to time MXAccess operations.</param>
         public MxAccessClient(StaComThread staThread, IMxProxy proxy, MxAccessConfiguration config, PerformanceMetrics metrics)
         {
             _staThread = staThread;
@@ -74,6 +99,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Host.MxAccess
             ConnectionStateChanged?.Invoke(this, new ConnectionStateChangedEventArgs(previous, newState, message));
         }
 
+        /// <summary>
+        /// Cancels monitoring and disconnects the runtime session before releasing local resources.
+        /// </summary>
         public void Dispose()
         {
             try