Add Massachusetts CSFP county filtering

[hua7450]

Summary

• Adds ma_dese_csfp_county_eligible gating the Commodity Supplemental Food Program by Massachusetts county, following the Kansas ([codex] Add Kansas CSFP county filtering #8585) and Missouri precedents.
• Adds gov/states/ma/dese/csfp/counties.yaml listing the six covered counties.
• Gates federal CSFP eligibility by the Massachusetts county variable when state_code is MA.

Program research

Massachusetts CSFP is administered by the Department of Elementary and Secondary Education (DESE), Office for Food and Nutrition Programs — not MDAR (which runs MEFAP/SFMNP) — hence the gov/states/ma/dese/csfp/ path. The MA CSFP State Plan names DESE as the distributing agency and The Greater Boston Food Bank as the sole local agency; the DESE food distribution page confirms this.

No government document enumerates counties directly, so the covered counties are derived from GBFB's 35+ CSFP distribution sites, each mapped to its county (same derivation approach as the KS site list and MO site map):

County	Example CSFP site towns
Bristol	New Bedford, Taunton, Attleboro, Fairhaven, Acushnet
Essex	Lawrence, Lynn, Peabody, Danvers, Marblehead
Middlesex	Lowell, Somerville, Medford, Newton, Waltham, Billerica
Norfolk	Quincy, Randolph, Brookline, Milton
Plymouth	Wareham, Rochester
Suffolk	Boston, Chelsea, Revere

Counties verified as not served:

• Barnstable, Dukes, Nantucket — inside GBFB's general nine-county territory but have no CSFP sites
• Worcester — Worcester County Food Bank has no CSFP program
• Hampden, Hampshire, Franklin, Berkshire — Food Bank of Western Massachusetts runs the state-funded "Brown Bag: Food for Elders" program, not federal CSFP

Changes

• parameters/gov/states/ma/dese/csfp/counties.yaml — six covered counties, effective 2025-01-01
• variables/gov/states/ma/dese/csfp/ma_dese_csfp_county_eligible.py — household-level county check (mirrors ks_dcf_csfp_county_eligible)
• variables/gov/usda/csfp/commodity_supplemental_food_program_eligible.py — adds the MA county gate alongside KS and MO
• tests/policy/baseline/gov/states/ma/dese/csfp/ma_dese_csfp_county_eligible.yaml — covered counties (Suffolk, Plymouth) and uncovered counties (Barnstable, Worcester)
• tests/policy/baseline/gov/usda/csfp/commodity_supplemental_food_program_eligible.yaml — integrated MA cases

Testing

• Direct county tests plus integrated federal CSFP eligibility tests (validated in CI)
• make format run before commit

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0797323) to head (7857608).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines           29        36    +7     
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+ Hits            29        36    +7     

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

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