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

src/MxGateway.Worker/MxAccess/MxAccessShutdownResult.cs

@@ -5,12 +5,16 @@ namespace MxGateway.Worker.MxAccess;
 
 public sealed class MxAccessShutdownResult
 {
+    /// <summary>Initializes a new instance of the <see cref="MxAccessShutdownResult"/> class.</summary>
+    /// <param name="failures">List of failures encountered during graceful shutdown.</param>
     public MxAccessShutdownResult(IReadOnlyList<MxAccessShutdownFailure> failures)
     {
         Failures = failures ?? throw new ArgumentNullException(nameof(failures));
     }
 
+    /// <summary>Gets the list of shutdown failures.</summary>
     public IReadOnlyList<MxAccessShutdownFailure> Failures { get; }
 
+    /// <summary>Gets a value indicating whether the shutdown succeeded with no failures.</summary>
     public bool Succeeded => Failures.Count == 0;
 }