kert a9e5d58601 fix(opps): CY2020 CF→80.784 (NFRM) + verify all 13 years vs Addendum B ...

With CY2014-2020 Addendum B now ingested, every year's conversion factor
is cross-checked against CMS's own published rates (weight × CF vs
payment_rate) — all 13 reconcile 100% exact, independently confirming the
Federal-Register CFs for 2014-2020.

One correction fell out: CY2020 = 80.784 (not 80.793). The archived
addenda are the NFRM (as-published) version, whose national rates were
computed with the as-published 80.784; CMS later cited a corrected
80.793, but our source data uses 80.784, so that is the value that
reproduces it to the cent. Update the rule, the golden pin, and the note.

Extend the CI fixture (tests/opps/fixtures/addendum_b_sample.csv) from
CY2021-2026 to all 13 years — 5 real rows per year spanning APC weights
~0.05 to ~700 — so the in-CI correctness proof now covers every year.

2026-07-08 14:52:17 -04:00

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