Add XML docs

RemoteExec.Shared/TaskItem.cs

@@ -1,7 +1,17 @@
 namespace RemoteExec.Shared;
 
+/// <summary>
+/// Represents a task item in the execution stream, combining a task ID with its execution request.
+/// </summary>
 public class TaskItem
 {
+    /// <summary>
+    /// Gets or sets the unique identifier for this task.
+    /// </summary>
     public Guid TaskId { get; set; }
+
+    /// <summary>
+    /// Gets or sets the execution request details.
+    /// </summary>
     public required RemoteExecutionRequest Request { get; set; }
 }