# R019 Code Review — Step 5: Testing & Verification

**Verdict:** APPROVE

No blocking findings. The R018 daily dense-index trend slope regression is fixed by deriving non-weekly x-values from the count of accepted finite samples, while weekly trends still use explicit bucket indexes. The added regression test covers the NaN gap case that previously produced a sparse-index slope.

## Tests run

- `go test ./internal/analysis ./internal/tools`
- `make test`
- `make build`
- `make lint`
