test(benchmarks): add C#/ASP.NET and TypeScript tasks

Six tasks with hidden checks: ASP.NET validation and 404 handling, C#
cancellation, and TypeScript overlap, deep merge, and debounce fixes, checked
with dotnet run and node --test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/benchmarks/tasks/16-aspnet-unknown-customer/hidden/Check/Program.cs

@@ -0,0 +1,18 @@
+using System.Net;
+using System.Text;
+using Microsoft.AspNetCore.Hosting.Server;
+using Microsoft.AspNetCore.Hosting.Server.Features;
+using Microsoft.Extensions.DependencyInjection;
+
+var app = Crm.AppHost.Build(new[] { "--urls", "http://127.0.0.1:0" });
+await app.StartAsync();
+var address = app.Services.GetRequiredService<IServer>().Features.Get<IServerAddressesFeature>()!.Addresses.First();
+using var client = new HttpClient { BaseAddress = new Uri(address) };
+var failures = new List<string>();
+var known = await client.GetAsync("/customers/1");
+if (known.StatusCode != HttpStatusCode.OK || !(await known.Content.ReadAsStringAsync()).Contains("Ada")) failures.Add($"known customer -> {(int)known.StatusCode}");
+var unknown = await client.GetAsync("/customers/42");
+if (unknown.StatusCode != HttpStatusCode.NotFound) failures.Add($"unknown customer -> {(int)unknown.StatusCode}");
+await app.StopAsync();
+foreach (var failure in failures) Console.Error.WriteLine("FAIL " + failure);
+return failures.Count == 0 ? 0 : 1;