chore: import upstream snapshot with attribution

dotnet/samples/05-end-to-end/DevUIAspireIntegration/WriterAgent/Program.cs

@@ -0,0 +1,37 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Azure.Identity;
+using Microsoft.Agents.AI.Hosting;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.AddServiceDefaults();
+
+builder.AddAzureChatCompletionsClient(connectionName: "foundry",
+    configureSettings: settings =>
+        {
+            // WARNING: DefaultAzureCredential is convenient for development but requires careful consideration in production.
+            // In production, consider using a specific credential (e.g., ManagedIdentityCredential) to avoid
+            // latency issues, unintended credential probing, and potential security risks from fallback mechanisms.
+            settings.TokenCredential = new DefaultAzureCredential();
+            settings.EnableSensitiveTelemetryData = builder.Environment.IsDevelopment();
+        })
+    .AddChatClient("gpt41");
+
+builder.AddAIAgent("writer", "You write short stories (300 words or less) about the specified topic.");
+
+// Register services for OpenAI responses and conversations
+builder.Services.AddOpenAIResponses();
+builder.Services.AddOpenAIConversations();
+
+var app = builder.Build();
+
+app.UseHttpsRedirection();
+
+// Map OpenAI API endpoints — DevUI aggregator routes requests here
+app.MapOpenAIResponses();
+app.MapOpenAIConversations();
+
+app.MapDefaultEndpoints();
+
+app.Run();