Three eval harnesses we ship with everything

Every project gets the same three evaluation harnesses before we call it production-ready:

1. Retrieval recall checks against a fixed golden set.
2. Output contract tests for shape, citations, and confidence signals.
3. Latency and cost regression checks on representative traffic.

This set is intentionally small. Bigger eval suites look impressive and then rot. Small suites run every time and catch what matters.