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/19-ts-debounce-arguments/hidden/check.test.ts

@@ -0,0 +1,18 @@
+import { test, mock } from 'node:test';
+import assert from 'node:assert/strict';
+import { debounce } from '../src/debounce.ts';
+
+test('trailing call uses the latest arguments', () => {
+  mock.timers.enable({ apis: ['setTimeout'] });
+  const calls: number[][] = [];
+  const run = debounce((value: number) => calls.push([value]), 50);
+  run(1); run(2); run(3);
+  mock.timers.tick(49);
+  assert.deepEqual(calls, []);
+  mock.timers.tick(1);
+  assert.deepEqual(calls, [[3]]);
+  run(4);
+  mock.timers.tick(50);
+  assert.deepEqual(calls, [[3], [4]]);
+  mock.timers.reset();
+});