# Code review — Step 1: Define segment selection and metrics

**Verdict: Approved**

No blocking findings.

## Notes

- The diff contains only task bookkeeping (`STATUS.md`) plus the prior approved plan review (`R003-plan-step1.md`); there are no production code changes to review for Step 1.
- The Step 1 design remains sufficiently specific for implementation: request shape, selector validation, canonical metric constraints, formula-reference policy, sample eligibility, and `_meta.n` semantics are all documented.
