P52: BCDA v3 migration — client, crosswalk-driven flatteners, vendored upstream fixtures, proving notebook
Move the bcda module from BCDA v2 to v3 (CMS deadline 2027-07-30). Sources: migration guide, July-2026 office-hours transition deck, BCDA_v3_Data_Dictionary.xlsx (CCLF + CCW crosswalk columns), official v3 sample files, CMSgov/bcda-app (sparse vendoring).
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bcda: BCDA v3 — client, crosswalk-driven flatteners, vendored upstream, proving notebook (P52)
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