Add WA SFA, WA RCA, and federal 5-year bar; fix WA TANF countable-income test

[hua7450]

Summary

Implements two new Washington State cash assistance programs alongside fixes to the existing WA TANF implementation:

• WA State Family Assistance (SFA) — state-funded cash assistance for families ineligible for federal TANF. Two pathways modeled: qualified aliens still in the 5-year bar (WAC 388-400-0010(2)(a)) and 19–20 year old students plus their caretaker relatives (WAC 388-400-0010(2)(c)–(d), WAC 388-404-0005(3)(b)).
• WA Refugee Cash Assistance (RCA) — federally-funded cash assistance for refugees, asylees, Cuban/Haitian entrants, those granted withholding of deportation, conditional entrants, and humanitarian parolees, within the 12-month ORR window (45 CFR 400.211) and disqualified when TANF or SFA applies (45 CFR 400.47).
• Federal 5-year bar on TANF (8 USC 1613) — new years_since_us_entry person-level input, federal parameters for the bar duration and statutory exemptions, and a wa_tanf_immigration_status_eligible variable applying the bar to Washington TANF.
• Humanitarian-parolee routing — PAROLED_ONE_YEAR is treated as TANF-bar-exempt to cover Afghan (P.L. 117-43) and Ukrainian (P.L. 117-128) humanitarian parolees, who are statutorily treated as refugees for federal benefit purposes. The PE enum doesn't distinguish those populations from other INA 212(d)(5) parolees, so this over-grants the bar exemption to a small population of non-humanitarian parolees — disclosed inline.
• API-partner override — wa_show_all_cash_assistance_programs (SPM-unit bool) bypasses immigration gates and the TANF/SFA/RCA mutex so consumers can display all three programs side-by-side. Demographic, income, and resource tests still apply.
• Fix: wa_tanf_income_eligible now also enforces WAC 388-450-0162 (countable income must be strictly below the payment standard). The prior implementation only checked the WAC 388-478-0035 applicant gross-earned-income cap, which let households with high unearned income pass eligibility.

Shared parameters

SFA and RCA reuse wa_tanf_payment_standard, wa_tanf_countable_income, wa_tanf_countable_earned_income, and wa_tanf_resources_eligible — consistent with WAC 388-478-0020 and 388-478-0035, which publish a single table for TANF, SFA, and RCA.

Eligibility gates

Status / household	WA TANF	WA SFA	WA RCA
Citizen family with child	yes	no	no
LPR past 5-year bar with child	yes	no	no
LPR in 5-year bar with child	no	yes	no
Refugee / asylee / CHE / DW / CE family with child (within window)	yes	no	no (TANF wins via 45 CFR 400.47)
Single refugee adult, within 12-month ORR window	no	no	yes
Single refugee adult, past 12-month ORR window	no	no	no
Humanitarian parolee (PAROLED_ONE_YEAR) family with child	yes	no	no
Citizen single mom + 19-year-old high school senior	no (over age)	yes (student pathway)	no
Undocumented / DACA / TPS	no	no	no

Not modeled (documented in code)

• 60-month state/federal TANF time limit (WAC 388-484-0005) — consistent with existing PolicyEngine behavior across other state TANF programs.
• TANF sanctions and noncompliance disqualifications for RCA (WAC 388-400-0030(2)(b)) and full-time higher-ed students (WAC 388-400-0030(2)(c)) — require sanction/enrollment data not tracked.
• Other SFA pathways — nonqualified aliens meeting WA residency (WAC 388-400-0010(2)(b)), T/U-visa and VAWA crime survivors (2)(f), pregnant women convicted of multi-state fraud (2)(e), and the discretionary two-parent provision (3) — not tracked.
• WAC 388-404-0005(3)(a) disability + special-education sub-pathway — students still in K-12 special education at ages 19–20 are typically captured by is_in_secondary_school.
• Mixed-status assistance unit composition (WAC 388-450-0210) — PE grants the full SPM-unit payment standard rather than the smaller AU payment standard for child-only cases. Cross-cutting limitation; affects all 50 state TANF programs.

Registry updates

• spm_unit_benefits sums the two new programs alongside TANF.
• household_state_benefits.yaml includes the WA entries under 2023-01-01 and 2024-01-01.
• programs.yaml is not updated in this PR; SFA/RCA still have documented coverage gaps and would warrant status: partial rather than complete. Will be added in a follow-up.

Regulatory authority

• WA TANF immigration: WAC 388-424-0006, WAC 388-424-0010, 8 USC 1613
• WA TANF countable income test: WAC 388-450-0162
• WA SFA: WAC 388-400-0010, WAC 388-424-0015, WAC 388-404-0005, RCW 74.08A.010
• WA RCA: WAC 388-400-0030, WAC 388-466-0120, 8 USC 1522, 45 CFR 400.47, 45 CFR 400.211
• Federal 5-year bar: 8 USC 1613(a) and (b)(1) exemptions
• Humanitarian parolees: P.L. 117-43 (Afghan), P.L. 117-128 (Ukrainian)

Microsim note

years_since_us_entry defaults to 5 and has no CPS imputation. With microsim defaults (immigration_status → CITIZEN, years_since_us_entry → 5), all eligible households route to TANF; SFA and RCA evaluate to zero. This is intentional — both programs have small caseloads in real life, and the household calculator is where the SFA/RCA logic matters most. A future imputation can drive non-zero microsim counts.

Test plan

• New unit tests pass — wa_tanf_immigration_status_eligible (14 cases), wa_sfa_immigration_status_eligible (8), wa_sfa_eligible (15), wa_sfa_student_pathway_eligible (6), wa_rca_immigration_status_eligible (10), wa_rca_eligible (9), wa_sfa (6), wa_rca (6)
• Updated wa_tanf_eligible.yaml and wa_tanf_income_eligible.yaml pass
• Integration test (wa/dshs/integration.yaml) passes — 13 cross-program scenarios including mixed-status, override, RCA window, humanitarian parolee, and student pathway
• 182 / 182 WA DSHS tests pass
• make format clean
• CI passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.79%. Comparing base (20705b0) to head (3afe240).
⚠️ Report is 25 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #8151       +/-   ##
===========================================
+ Coverage   85.36%   96.79%   +11.42%     
===========================================
  Files           3       13       +10     
  Lines          41      187      +146     
  Branches        2        2               
===========================================
+ Hits           35      181      +146     
  Misses          6        6               

Flag	Coverage Δ
unittests	96.79% <100.00%> (+11.42%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.