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/18-ts-deep-merge/hidden/check.test.ts

@@ -0,0 +1,17 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { mergeConfig } from '../src/config.ts';
+
+test('nested objects merge deeply', () => {
+  const base = { server: { host: 'a', port: 1, tls: { on: true } }, tags: ['x'] };
+  const override = { server: { port: 2, tls: { cert: 'c' } }, tags: ['y', 'z'] };
+  assert.deepEqual(mergeConfig(base, override), { server: { host: 'a', port: 2, tls: { on: true, cert: 'c' } }, tags: ['y', 'z'] });
+});
+
+test('inputs are not mutated', () => {
+  const base = { a: { b: 1 } };
+  const override = { a: { c: 2 } };
+  mergeConfig(base, override);
+  assert.deepEqual(base, { a: { b: 1 } });
+  assert.deepEqual(override, { a: { c: 2 } });
+});

scripts/benchmarks/tasks/18-ts-deep-merge/repo/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "config",
+  "type": "module",
+  "private": true
+}

scripts/benchmarks/tasks/18-ts-deep-merge/repo/src/config.ts

@@ -0,0 +1,5 @@
+export type Config = { [key: string]: unknown };
+
+export function mergeConfig(base: Config, override: Config): Config {
+  return { ...base, ...override };
+}

scripts/benchmarks/tasks/18-ts-deep-merge/task.json

@@ -0,0 +1,13 @@
+{
+  "prompt": "mergeConfig() drops nested settings from the base configuration when the override sets only some keys of a nested object. Merge nested objects deeply; arrays from the override replace base arrays, and neither input may be mutated.",
+  "check": [
+    "node",
+    "--experimental-strip-types",
+    "--no-warnings",
+    "--test",
+    "bench_hidden/check.test.ts"
+  ],
+  "workflow": {
+    "kind": "TypeScript change"
+  }
+}