Expand XML docs across bridge and test code

tools/opcuacli-dotnet/Commands/SubscribeCommand.cs

@@ -9,15 +9,28 @@ namespace OpcUaCli.Commands;
 [Command("subscribe", Description = "Monitor a node for value changes")]
 public class SubscribeCommand : ICommand
 {
+    /// <summary>
+    /// Gets the OPC UA endpoint URL to connect to before subscribing.
+    /// </summary>
     [CommandOption("url", 'u', Description = "OPC UA server endpoint URL", IsRequired = true)]
     public string Url { get; init; } = default!;
 
+    /// <summary>
+    /// Gets the node identifier to monitor for value changes.
+    /// </summary>
     [CommandOption("node", 'n', Description = "Node ID to monitor", IsRequired = true)]
     public string NodeId { get; init; } = default!;
 
+    /// <summary>
+    /// Gets the sampling and publishing interval, in milliseconds, for the monitored item.
+    /// </summary>
     [CommandOption("interval", 'i', Description = "Polling interval in milliseconds")]
     public int Interval { get; init; } = 1000;
 
+    /// <summary>
+    /// Connects to the OPC UA endpoint and streams monitored-item notifications until cancellation.
+    /// </summary>
+    /// <param name="console">The console used to display subscription updates.</param>
     public async ValueTask ExecuteAsync(IConsole console)
     {
         using var session = await OpcUaHelper.ConnectAsync(Url);