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Temporarily handle missing ACS WIC participation inputs #560

Description

@anth-volk

Implement only the immediate temporary WIC compatibility fix for the certified
ACS-local dataset. Preserve every valid existing ACS and donor participation
decision, set only missing decisions for people explicitly identified as
acs_2024_1yr to True, and continue rejecting missing donor inputs, missing
identifying provenance, and malformed values. Eligibility remains determined
by the country model.

Add focused mapping and real country-model integration tests. The exception
must carry an obvious removal comment and remain removable in a separate
stacked draft PR after a replacement local-area dataset is published and
certified. Dataset rebuild and publication are owned separately by
PolicyEngine/microcosm#1154.

This issue does not include the source-partition/state-year preparation
prototype, new public preparation APIs, dataset-loader refactoring, national
default changes, service deployment, or new infrastructure.

The narrowly scoped replacement is #566; it supersedes the oversized draft #562.

Activity

  1. changed the title [-]Unblock ACS state/year preparation with a temporary WIC assumption[/-] [+]Temporarily handle missing ACS WIC participation inputs[/+] on Oct 8, 2026
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