Add XML documentation across gateway, worker, and .NET client

src/MxGateway.Server/Grpc/IEventStreamService.cs

@@ -2,8 +2,16 @@ using MxGateway.Contracts.Proto;
 
 namespace MxGateway.Server.Grpc;
 
+/// <summary>
+/// Streams MXAccess events to gRPC clients.
+/// </summary>
 public interface IEventStreamService
 {
+    /// <summary>
+    /// Streams events for the specified session to the caller.
+    /// </summary>
+    /// <param name="request">Request payload.</param>
+    /// <param name="cancellationToken">Token to cancel the asynchronous operation.</param>
     IAsyncEnumerable<MxEvent> StreamEventsAsync(
         StreamEventsRequest request,
         CancellationToken cancellationToken);