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

src/MxGateway.Worker/MxAccess/MxAccessCommandExecutor.cs

@@ -6,16 +6,28 @@ using MxGateway.Worker.Sta;
 
 namespace MxGateway.Worker.MxAccess;
 
+/// <summary>
+/// Executes MXAccess commands on an STA session.
+/// </summary>
 public sealed class MxAccessCommandExecutor : IStaCommandExecutor
 {
     private readonly MxAccessSession session;
     private readonly VariantConverter variantConverter;
 
+    /// <summary>
+    /// Initializes a command executor with an MXAccess session.
+    /// </summary>
+    /// <param name="session">MXAccess session on the STA thread.</param>
     public MxAccessCommandExecutor(MxAccessSession session)
         : this(session, new VariantConverter())
     {
     }
 
+    /// <summary>
+    /// Initializes a command executor with an MXAccess session and a variant converter.
+    /// </summary>
+    /// <param name="session">MXAccess session on the STA thread.</param>
+    /// <param name="variantConverter">Converter for MXAccess variant values to MxValue protobuf messages.</param>
     public MxAccessCommandExecutor(
         MxAccessSession session,
         VariantConverter variantConverter)
@@ -24,6 +36,11 @@ public sealed class MxAccessCommandExecutor : IStaCommandExecutor
         this.variantConverter = variantConverter ?? throw new ArgumentNullException(nameof(variantConverter));
     }
 
+    /// <summary>
+    /// Executes an MXAccess command and returns the reply.
+    /// </summary>
+    /// <param name="command">STA command to execute.</param>
+    /// <returns>Command reply with result or error details.</returns>
     public MxCommandReply Execute(StaCommand command)
     {
         if (command is null)