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/repo/src/debounce.ts

@@ -0,0 +1,15 @@
+export function debounce<T extends unknown[]>(fn: (...args: T) => void, wait: number): (...args: T) => void {
+  let timer: ReturnType<typeof setTimeout> | undefined;
+  let pending: T | undefined;
+  return (...args: T) => {
+    if (pending === undefined) {
+      pending = args;
+    }
+    clearTimeout(timer);
+    timer = setTimeout(() => {
+      const call = pending as T;
+      pending = undefined;
+      fn(...call);
+    }, wait);
+  };
+}