The js-ts-class E2E test was flaky because n=100 is too small for
the O(n²)→O(n) optimization to overcome Map/Set per-operation overhead.
At n=100, the LLM correctly generates a Map-based O(n) solution but it
benchmarks as slower (-10.6%) due to constant factor dominance.
Bump to n=10,000 so the algorithmic improvement produces measurable
speedup, making the 30% E2E threshold reliably achievable.
a73ccca426