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

src/MxGateway.Server/Workers/IWorkerStartupProbe.cs

@@ -2,6 +2,13 @@ namespace MxGateway.Server.Workers;
 
 public interface IWorkerStartupProbe
 {
+    /// <summary>
+    /// Waits for the worker process to reach a ready state asynchronously.
+    /// </summary>
+    /// <param name="process">Worker process to probe.</param>
+    /// <param name="request">Worker launch request.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>Completed task.</returns>
     Task WaitUntilReadyAsync(
         IWorkerProcess process,
         WorkerProcessLaunchRequest request,