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/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\Crm\Crm.csproj" />
+  </ItemGroup>
+</Project>

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;

scripts/benchmarks/tasks/16-aspnet-unknown-customer/repo/src/Crm/AppHost.cs

@@ -0,0 +1,16 @@
+namespace Crm;
+
+public static class AppHost
+{
+    // Integration tests start the application through Build.
+    public static WebApplication Build(string[] args)
+    {
+        var builder = WebApplication.CreateBuilder(args);
+        var app = builder.Build();
+        var customers = new Dictionary<int, Customer> { [1] = new(1, "Ada") };
+        app.MapGet("/customers/{id:int}", (int id) => customers[id]);
+        return app;
+    }
+}
+
+public record Customer(int Id, string Name);

scripts/benchmarks/tasks/16-aspnet-unknown-customer/repo/src/Crm/Crm.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+</Project>

scripts/benchmarks/tasks/16-aspnet-unknown-customer/repo/src/Crm/Program.cs

@@ -0,0 +1 @@
+Crm.AppHost.Build(args).Run();

scripts/benchmarks/tasks/16-aspnet-unknown-customer/task.json

@@ -0,0 +1,13 @@
+{
+  "prompt": "Requesting an unknown customer with GET /customers/{id} returns HTTP 500. Return 404 instead, and keep known customers working.",
+  "check": [
+    "dotnet",
+    "run",
+    "--project",
+    "bench_hidden/Check",
+    "--nologo"
+  ],
+  "workflow": {
+    "kind": "C#/ASP.NET change"
+  }
+}