6 tests that instantiate ErasExpertNode directly (no HTTP, no pipeline).
Assert SQL table selection, JOIN patterns, and response hygiene.
2 LLM calls per test vs 4+ for matrix — runs in ~22s total locally.
Requires pymysql in venv and DB access (WireGuard or NodePort).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
