Add West Virginia TANF (WV Works) program

[hua7450]

Summary

Implements the West Virginia WV Works (TANF) program.

Fixes #7045

Regulatory Authority

• WV Income Maintenance Manual (2024)

Income Eligibility Test

Gross income must be at or below 100% of the Standard of Need (SON).

Source: Section 4.5.2

Income Deductions & Exemptions

Deduction	Amount	Source
Earned Income Disregard	40% of gross earnings	Section 4.5.2.A.1
Dependent Care Deduction	Actual expenses (no cap)	Section 4.5.2.A.2
Child Support Disregard	$100 (1 child), $200 (2+ children)	Section 4.5.2.B

Income Standards

Household Size	Standard of Need (100%)	Payment Standard
1	$581	$417
2	$786	$480
3	$991	$542
4	$1,196	$612
5	$1,401	$670
6	$1,606	$734
7	$1,811	$793
8	$2,016	$811
9	$2,221	$811
10+	$2,426	$811

Source: Appendix A

Resource Limit

$2,000 countable resources.

Source: Chapter 11

Benefit Calculation

Benefit = Payment Standard - Countable Income

Where:

• Countable Earned = (Gross Earned × 0.60) - Dependent Care
• Countable Unearned = Gross Unearned - Child Support Disregard
• Countable Income = Countable Earned + Countable Unearned

Source: Section 4.5.3

Test Coverage

50 tests covering:

• Income eligibility (6 tests)
• Resource eligibility (5 tests)
• Combined eligibility (6 tests)
• Earned income with 40% disregard (5 tests)
• Dependent care deduction (5 tests)
• Child support disregard (7 tests)
• Benefit calculation (6 tests)
• Full pipeline integration (8 tests)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f847eff) to head (fbd851a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7046   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         7    +5     
  Lines           22        99   +77     
=========================================
+ Hits            22        99   +77     

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

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[PavelMakarchuk]

PR Review

🟢 Summary: APPROVED with Minor Fixes

The West Virginia WV Works implementation is high quality with comprehensive test coverage (43 tests). All regulatory requirements are correctly implemented. One description formatting issue should be addressed.

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✅ Validation Results

Check	Result	Notes
Regulatory Accuracy	PASSED	All values match WV Income Maintenance Manual
Reference Quality	PASSED	All refs have page anchors, authoritative sources
Code Patterns	PASSED	Proper vectorization, no hard-coded values
Test Coverage	GOOD	43 tests, comprehensive scenarios
CI Status	Failing	uv.lock freshness (merge conflict)

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🔴 Critical (Must Fix)

None - No critical functional issues found.

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🟡 Should Address

1. CI Failure: uv.lock freshness check failing. Resolve merge conflict:

   git fetch origin && git merge origin/main
   git checkout --theirs uv.lock && uv lock --upgrade

2. Description Acronym: 6 parameter files use "WV Works" instead of full name. Per PolicyEngine standards, descriptions should spell out program names:

   File	Fix
   payment_standard/amount.yaml	"WV Works" → "West Virginia Works"
   standard_of_need/amount.yaml	"WV Works" → "West Virginia Works"
   earned_income_disregard/rate.yaml	"WV Works" → "West Virginia Works"
   child_support_disregard.yaml	"WV Works" → "West Virginia Works"
   resources/limit.yaml	"WV Works" → "West Virginia Works"
   max_household_size.yaml	"WV Works" → "West Virginia Works"

3. Reference Page Anchor Missing: wv_works_resources_eligible.py reference URL should include #page=XX

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🟢 Suggestions (Optional)

1. Add boundary tests: Consider tests for income exactly $1 above threshold
2. Reference title consistency: Minor formatting differences in Appendix A titles (e.g., "Income Limit" vs "Income Limits")

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Verification Summary

Key Parameter Values Verified:

Parameter	Value	Source
Earned Income Disregard	40%	Section 4.5.2.A.1
Child Support Disregard	$100/$200	Section 4.5.2.B
Standard of Need (Size 3)	$991	Appendix A
Payment Standard (Size 3)	$542	Appendix A
Resource Limit	$2,000	Chapter 11

Manual Calculation Verified (Integration Case 8):

• Gross earned: $500/month
• After 40% disregard: $500 × 0.60 = $300
• Childcare: $100 → Countable earned: $200
• Child support: $150, 1 child → $100 disregard → Countable unearned: $50
• Total countable: $250
• Payment standard (size 2): $480
• Benefit: $480 - $250 = $230 ✓

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Code Quality Highlights

• ✅ Uses adds for pure aggregation (wv_works_countable_income)
• ✅ Uses add() > 0 pattern for immigration check
• ✅ Uses max_() to prevent negative values
• ✅ Uses period.this_year for stock variables (assets, children count)
• ✅ All values parameterized (no hard-coded numbers)
• ✅ Excellent test documentation with calculation comments
• ✅ Correct child support disregard bracket structure

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Next Steps

1. Resolve uv.lock merge conflict (required for CI)
2. Update 6 parameter descriptions to use "West Virginia Works" (should fix)
3. Add page anchor to resources_eligible reference (optional)

To auto-fix issues: /fix-pr 7046

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