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/package.json

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