Standard-Astro

Checklist for integrating a new cosmology dataset (or upgrading a compressed entry to a full likelihood) into the backend/app/services/cosmology_likelihoods/ package. Use whenever the task is "add/integrate/wire dataset X", "upgrade X to full covariance", or "make X executable in-process". Every step below exists because skipping it produced a real bug — do not skim.

Run a cosmology science-regression smoke check. Verifies ΛCDM BAO+CMB recovers H0≈67.4, wCDM BAO+CMB recovers w≈-1, three-tier chain_tier triggers correctly (publication/exploratory/blocked), and distance_modulus_model stays within 1e-3 mag of astropy. Use after any change to backend/app/services/cosmology_*.py or backend/app/services/cosmology_likelihoods.py to confirm no science regression.