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/14-aspnet-order-validation/hidden/Check/Check.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    <ProjectReference Include="..\..\src\Shop\Shop.csproj" />
+  </ItemGroup>
+</Project>

scripts/benchmarks/tasks/14-aspnet-order-validation/hidden/Check/Program.cs

@@ -0,0 +1,24 @@
+using System.Net;
+using System.Text;
+using Microsoft.AspNetCore.Hosting.Server;
+using Microsoft.AspNetCore.Hosting.Server.Features;
+using Microsoft.Extensions.DependencyInjection;
+
+var app = Shop.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>();
+async Task Expect(string json, int status)
+{
+    var response = await client.PostAsync("/orders", new StringContent(json, Encoding.UTF8, "application/json"));
+    if ((int)response.StatusCode != status) failures.Add($"{json} -> {(int)response.StatusCode}, expected {status}");
+    else if (status == 400 && response.Content.Headers.ContentType?.MediaType != "application/problem+json") failures.Add($"{json} -> 400 without problem details");
+}
+await Expect("{\"sku\":\"A1\",\"quantity\":2}", 201);
+await Expect("{\"sku\":\"A1\",\"quantity\":0}", 400);
+await Expect("{\"sku\":\"A1\",\"quantity\":-3}", 400);
+await Expect("{\"sku\":\"\",\"quantity\":1}", 400);
+await app.StopAsync();
+foreach (var failure in failures) Console.Error.WriteLine("FAIL " + failure);
+return failures.Count == 0 ? 0 : 1;