Count cash aid, veterans benefits, rental income, pensions, and survivor benefits as Texas TANF unearned income

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Summary

Adds seven income sources to gov/states/tx/tanf/income/sources/unearned.yaml that the federal TANF unearned list includes and the Texas Works Handbook counts, but the TX list omitted. Before this change no cash-aid input a partner could send (financial_assistance, gi_cash_assistance, general_assistance) was counted by tx_tanf, and veterans benefits, rental income, pensions, and survivor benefits were ignored as well.

Closes #9381

Regulatory authority

• Texas Works Handbook A-1320 Types of Income: "Income that is not specifically listed in this section must be counted." https://fhb.hhs.texas.gov/handbooks/texas-works-handbook/a-1320-types-income
• 1 TAC §372.401(a): unearned income is "all other income" outside the earned definition. https://www.law.cornell.edu/regulations/texas/1-Tex-Admin-Code-SS-372-401

Sources added

Source	Handbook treatment
financial_assistance, gi_cash_assistance	A-1326.1: cash gifts and contributions count as unearned income. The exemption for need-based nonprofit contributions up to $300/quarter is not modeled.
general_assistance	A-1320 catch-all
veterans_benefits	A-1324.20: gross benefit counted as unearned
rental_income	A-1323.4.2 / A-1325: unearned unless managed 20+ hours a week; all rental income treated as unearned
pension_income	A-1320 catch-all; railroad retirement explicit at A-1324.23
survivor_benefits	A-1324.16: RSDI counted as unearned

Unchanged sources are annotated with their handbook subsections, and the handbook link is updated to the fhb.hhs.texas.gov host the old URL redirects to.

Not changed

• TX CEAP sources.yaml: financial_assistance represents cash gifts and contributions, which Texas excludes from CEAP under 10 TAC §6.4(d)(9) and the FY2026 LIHEAP plan §1.9 (https://www.tdhca.texas.gov/sites/default/files/community-affairs/docs/26-LIHEAP-Plan-Amend1.pdf#page=8). CEAP already counts general_assistance.
• Federal TANF, WIC, school meals, and other state TANF lists: general_assistance gaps there are tracked in Count general_assistance as unearned income in TANF, WIC, and school meals income lists #9382.

Tests

• New tx_tanf_gross_unearned_income.yaml: each added source counted; earned income, SSI, and TANF not counted.
• Two household-level cases added to tx_tanf_countable_unearned_income.yaml: reported cash aid flows through, and veterans benefits plus child support with the $75 deduction.
• No existing TX TANF test used any of the added inputs, so current cases are unaffected.

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