docs: add xml comments for Essentials routing

src/PepperDash.Essentials.Core/Routing/RouteRequest.cs

@@ -4,15 +4,42 @@ using System;
 
 namespace PepperDash.Essentials.Core
 {
+    /// <summary>
+    /// Represents a request to establish a route between a source and a destination device.
+    /// </summary>
     public class RouteRequest
     {
+        /// <summary>
+        /// The specific input port on the destination device to use for the route. Can be null if the port should be automatically determined or is not applicable.
+        /// </summary>
         public RoutingInputPort DestinationPort { get; set; }
 
+        /// <summary>
+        /// The specific output port on the source device to use for the route. Can be null if the port should be automatically determined or is not applicable.
+        /// </summary>
         public RoutingOutputPort SourcePort { get; set; }
+
+        /// <summary>
+        /// The destination device (sink or midpoint) for the route.
+        /// </summary>
         public IRoutingInputs Destination { get; set; }
+
+        /// <summary>
+        /// The source device for the route.
+        /// </summary>
         public IRoutingOutputs Source { get; set; }
+
+        /// <summary>
+        /// The type of signal being routed (e.g., Audio, Video, AudioVideo).
+        /// </summary>
         public eRoutingSignalType SignalType { get; set; }
 
+        /// <summary>
+        /// Handles the route request after a device's cooldown period has finished.
+        /// This method is typically subscribed to the IsCoolingDownFeedback.OutputChange event.
+        /// </summary>
+        /// <param name="sender">The object that triggered the event (usually the cooling device).</param>
+        /// <param name="args">Event arguments indicating the cooldown state change.</param>
         public void HandleCooldown(object sender, FeedbackEventArgs args)
         {
             try
@@ -39,6 +66,10 @@ namespace PepperDash.Essentials.Core
             }
         }
 
+        /// <summary>
+        /// Returns a string representation of the route request.
+        /// </summary>
+        /// <returns>A string describing the source and destination of the route request.</returns>
         public override string ToString()
         {
             return $"Route {Source?.Key ?? "No Source Device"}:{SourcePort?.Key ?? "auto"} to {Destination?.Key ?? "No Destination Device"}:{DestinationPort?.Key ?? "auto"}";