Fix CA CalWORKs per-person applicant earned income disregard

[hua7450]

Note: 9 of 17 files changed are minor reference URL and typo fixes. The core logic change is in the income variables and tests.

Summary

Fixes #770, Fixes #5488

Per WIC 11450.12, the applicant earned income disregard ($450/month) must be applied "for each employed person", not as a single flat amount per assistance unit. A two-earner household should receive $900/month in disregards, not $450.

Regulatory Authority

• WIC § 11450.12(a)(1): "exclusive of the first four hundred fifty dollars ($450) of earned income for each employed person"
• ACL 21-130 (p.3): Worked example showing "$450 Earned Income Disregard Per Working Person ($450 x 2)" for two-earner household

Changes

Per-person applicant disregard (main fix)

• New: ca_tanf_earned_income_person — Person-level gross earned income using CA income source list
• New: ca_tanf_earned_income_after_disregard_person — Applies $450/person flat disregard at person level
• Updated: ca_tanf_countable_income_applicant — Sums person-level post-disregard earned income via add()
• Updated: ca_tanf_earned_income — Now derives from ca_tanf_earned_income_person (single source of truth)

Broken reference links (#5488)

• Removed broken San Diego County URL (hhsaprogramguides.sandiegocounty.gov) from 6 parameter files and 1 variable
• Replaced with CDSS ACL 24-55 official source

Minor fixes

• Fixed typo financial_eligibile → financial_eligible in ca_tanf_eligible.py
• Fixed typo exlusion → exclusion in ca_tanf_countable_income_recipient.py

Recipient disregard — verified correct (no changes)

The recipient $600 flat exclusion (WIC § 11451.5) is per-AU, not per-person — confirmed by ACL 21-130 (p.4) and the NA 200 budget worksheet which has a single disregard line. The existing code correctly implements the shared pool logic (DBI first → carry remainder to earned → 50% of remaining earned).

Test plan

• 5 unit tests for ca_tanf_earned_income_after_disregard_person
• 10 unit tests for ca_tanf_countable_income_applicant (including multi-earner Cases 8-10)
• New integration Case 6: two-earner family of 4 exercising per-person disregard end-to-end
• All 169 existing CA TANF cash tests pass (no regressions)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4418878) to head (5bf4e37).
⚠️ Report is 53 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7861   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         7    +6     
  Lines           21       100   +79     
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+ Hits            21       100   +79     

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

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