The fixture-driven test now exercises both spot-check batches:
- spot_check_visits.csv (10 NOT_IN_835 visits)
- spot_check_visits_batch2.csv (10 DENIED+PARTIAL visits)
All 20 visits run through build_claim_output → serialize_837 → SP40
local validator (25 R-codes) → structural_spot_check. Full backend
suite: 1568 passed (was 1567).
Nora