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/17-ts-booking-overlap/hidden/check.test.ts

@@ -0,0 +1,14 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { overlaps } from '../src/booking.ts';
+
+test('back-to-back bookings do not overlap', () => {
+  assert.equal(overlaps({ start: 9, end: 10 }, { start: 10, end: 11 }), false);
+  assert.equal(overlaps({ start: 10, end: 11 }, { start: 9, end: 10 }), false);
+});
+
+test('real overlaps are detected', () => {
+  assert.equal(overlaps({ start: 9, end: 11 }, { start: 10, end: 12 }), true);
+  assert.equal(overlaps({ start: 9, end: 12 }, { start: 10, end: 11 }), true);
+  assert.equal(overlaps({ start: 9, end: 10 }, { start: 11, end: 12 }), false);
+});