.NET: Joslat fix sample issue (microsoft#3270)

* adds support for labels in edges,  fixes rendering of labels in dot and mermaid, adds rendering of labels in edges

* Update dotnet/src/Microsoft.Agents.AI.Workflows/Visualization/WorkflowVisualizer.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* escaping edge labels, adding tests for labels containing strange characters that would break the diagram and enabling the previous signature so the API has backwards compatibility.

* Unify label in EdgeData

* Edge API adjustments, removed useless "sanitizer"

* fixed test

* Fix in Sample

* update

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Jacob Alber <jaalber@microsoft.com>
Co-authored-by: Chris <66376200+crickman@users.noreply.github.com>

Author: 4 people

dotnet/samples/GettingStarted/Workflows/_Foundational/07_MixedWorkflowAgentsAndExecutors/Program.cs

@@ -129,7 +129,7 @@ private static async Task Main()
     private static async Task ExecuteWorkflowAsync(Workflow workflow, string input)
     {
         // Configure whether to show agent thinking in real-time
-        const bool ShowAgentThinking = false;
+        const bool ShowAgentThinking = true;
 
         // Execute in streaming mode to see real-time progress
         await using StreamingRun run = await InProcessExecution.StreamAsync(workflow, input);
@@ -230,14 +230,23 @@ public override async ValueTask HandleAsync(string message, IWorkflowContext con
 /// Executor that synchronizes agent output and prepares it for the next stage.
 /// This demonstrates how executors can process agent outputs and forward to the next agent.
 /// </summary>
-internal sealed class JailbreakSyncExecutor() : Executor<ChatMessage>("JailbreakSync")
+/// <remarks>
+/// The AIAgentHostExecutor sends response.Messages which has runtime type List&lt;ChatMessage&gt;.
+/// The message router uses exact type matching via message.GetType().
+/// </remarks>
+internal sealed class JailbreakSyncExecutor() : Executor<List<ChatMessage>>("JailbreakSync")
 {
-    public override async ValueTask HandleAsync(ChatMessage message, IWorkflowContext context, CancellationToken cancellationToken = default)
+    public override async ValueTask HandleAsync(List<ChatMessage> message, IWorkflowContext context, CancellationToken cancellationToken = default)
     {
         Console.WriteLine(); // New line after agent streaming
         Console.ForegroundColor = ConsoleColor.Magenta;
 
-        string fullAgentResponse = message.Text?.Trim() ?? "UNKNOWN";
+        // Combine all response messages (typically just one for simple agents)
+        string fullAgentResponse = string.Join("\n", message.Select(m => m.Text?.Trim() ?? "")).Trim();
+        if (string.IsNullOrEmpty(fullAgentResponse))
+        {
+            fullAgentResponse = "UNKNOWN";
+        }
 
         Console.WriteLine($"[{this.Id}] Full Agent Response:");
         Console.WriteLine(fullAgentResponse);
@@ -278,17 +287,24 @@ public override async ValueTask HandleAsync(ChatMessage message, IWorkflowContex
 /// <summary>
 /// Executor that outputs the final result and marks the end of the workflow.
 /// </summary>
-internal sealed class FinalOutputExecutor() : Executor<ChatMessage, string>("FinalOutput")
+/// <remarks>
+/// The AIAgentHostExecutor sends response.Messages which has runtime type List&lt;ChatMessage&gt;.
+/// The message router uses exact type matching via message.GetType().
+/// </remarks>
+internal sealed class FinalOutputExecutor() : Executor<List<ChatMessage>, string>("FinalOutput")
 {
-    public override ValueTask<string> HandleAsync(ChatMessage message, IWorkflowContext context, CancellationToken cancellationToken = default)
+    public override ValueTask<string> HandleAsync(List<ChatMessage> message, IWorkflowContext context, CancellationToken cancellationToken = default)
     {
+        // Combine all response messages (typically just one for simple agents)
+        string combinedText = string.Join("\n", message.Select(m => m.Text ?? "")).Trim();
+
         Console.WriteLine(); // New line after agent streaming
         Console.ForegroundColor = ConsoleColor.Green;
         Console.WriteLine($"\n[{this.Id}] Final Response:");
-        Console.WriteLine($"{message.Text}");
+        Console.WriteLine($"{combinedText}");
         Console.WriteLine("\n[End of Workflow]");
         Console.ResetColor();
 
-        return ValueTask.FromResult(message.Text ?? string.Empty);
+        return ValueTask.FromResult(combinedText);
     }
 }