Fix SNAP work requirement issues

[daphnehanse11]

Summary

Closes #8139.
Closes #8297.

This is a scoped SNAP work-requirement fix that:

• changes meets_snap_work_requirements so one non-compliant member no longer denies the entire SPM unit when another member meets the work requirements
• adds is_snap_abawd_indian_exempt for the OBBBA ABAWD Indian, Urban Indian, and California Indian exception
• applies the new Indian exemption only in the post-OBBBA/HR1 ABAWD path so pre-HR1 behavior is unchanged
• removes the non-functional boolean error margins in the existing SPM-level SNAP work-requirement tests

This is intended as a clean replacement for the narrow #8139 part of #8148. It does not include #8148's SNAP unit-size or proration changes.

Validation

• uv run python -m policyengine_core.scripts.policyengine_command test policyengine_us/tests/policy/baseline/gov/usda/snap/eligibility/work_requirements/meets_snap_work_requirements.yaml policyengine_us/tests/policy/baseline/gov/usda/snap/eligibility/work_requirements/meets_snap_abawd_work_requirements.yaml -c policyengine_us
  • 41 passed.
• uv run python -m policyengine_core.scripts.policyengine_command test policyengine_us/tests/policy/baseline/gov/usda/snap -c policyengine_us
  • 306 passed.
• uv run --extra dev ruff format .
• uv run --extra dev ruff check .
• uv run pytest policyengine_us/tests/test_parameter_files.py policyengine_us/tests/test_system_import.py -q
  • 9 passed.
• git diff --check

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (8f458cd) to head (a81801f).
⚠️ Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #8372   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         3    -1     
  Lines           52        59    +7     
=========================================
+ Hits            52        59    +7     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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