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

src/MxGateway.Server/Workers/SystemWorkerProcessFactory.cs

@@ -2,8 +2,12 @@ using System.Diagnostics;
 
 namespace MxGateway.Server.Workers;
 
+/// <summary>
+/// Factory that creates system processes for workers.
+/// </summary>
 public sealed class SystemWorkerProcessFactory : IWorkerProcessFactory
 {
+    /// <inheritdoc />
     public IWorkerProcess Start(ProcessStartInfo startInfo)
     {
         Process process = new()