test(benchmarks): tag tasks as small change, larger implementation, or search

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/benchmarks/tasks/19-ts-debounce-arguments/task.json

@@ -1,4 +1,5 @@
 {
+  "category": "small change",
   "prompt": "debounce() calls the wrapped function with the arguments of the first call in a burst instead of the last one. Fix it so the trailing call uses the latest arguments.",
   "check": [
     "node",