Add San Mateo County General Assistance

[hua7450]

Fixes #8359.

Summary

Adds San Mateo County General Assistance as a local California cash assistance program.

Regulatory Authority

• San Mateo County Human Services Agency General Assistance Fact Sheet, dated February 2025
• San Mateo County Human Services Agency Standards of Assistance, C-335 Rev. 12.2025
• San Mateo County Board File 26-290, increasing the NMOHC with BHRS/SMMC referral standard effective January 1, 2026

Modeled Rules

Requirement	Coverage
San Mateo County residency	in_smc
Qualified immigration status	ca_smc_general_assistance_immigration_status_eligible_person and parameter list
Countable income	ca_smc_general_assistance_countable_income using income/sources.yaml
Income eligibility	Countable income at or below the applicable payment standard
Property eligibility	Property below $1,464
Vehicle exclusion	Excludes one vehicle regardless of value
Living arrangement standards	Enum input covering independent living, drug/alcohol treatment, NMOHC without referral, and NMOHC with referral
Benefit amount	max(payment standard - countable income, 0)

Payment Standards

• Independent living: $732, effective 2023-10-01
• Drug and alcohol treatment center: $732, effective 2023-10-01
• NMOHC without BHRS/SMMC referral: $732, effective 2023-10-01
• NMOHC with BHRS/SMMC referral: $1,599.07, effective 2025-01-01; $1,626.07, effective 2026-01-01

Not Modeled

• Age factor, because public sources list age as a factor but do not publish a threshold.
• ID/SSN verification, interview, QR7/renewal/reporting, application processing timeline, work activity compliance, other-income application requirement, and the six-month-in-twelve employable-recipient time limit.

Tests

policyengine-core test policyengine_us/tests/policy/baseline/gov/local/ca/smc -c policyengine_us -v
make format

Result: 33 focused tests passed; formatter and ruff checks passed.

Known Failing Tests

None.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (8f458cd) to head (9441c1a).
⚠️ Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main     #8360    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files            4        12     +8     
  Lines           52       162   +110     
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+ Hits            52       162   +110     

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

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