Update 2026 FPL values

[hua7450]

Summary

Updates federal poverty guidelines with 2026 values.

Fixes #7159

Changes

Added 2026 values to gov/hhs/fpg.yaml:

Region	first_person	additional_person
CONTIGUOUS_US	$15,960	$5,680
AK	$19,950	$7,100
HI	$18,360	$6,530

Test Updates

Updated expected values in test cases that depend on FPG:

• tx_fpp_income_limit.yaml - Texas Family Planning Program income limits
• edaa_end_child_poverty_act.yaml - End Child Poverty Act child benefits

These tests previously used 2025 FPG values + uprating projections for 2026. Now they use the actual 2026 FPG values.

Reference

• 2026 Poverty Guidelines

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.76%. Comparing base (f321027) to head (60c5dcc).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7223      +/-   ##
==========================================
+ Coverage   70.90%   73.76%   +2.85%     
==========================================
  Files        3666     3666              
  Lines       52712    52712              
  Branches      263      263              
==========================================
+ Hits        37377    38882    +1505     
+ Misses      15335    13815    -1520     
- Partials        0       15      +15     

Flag	Coverage Δ
unittests	73.76% <ø> (+2.85%)	⬆️

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[PavelMakarchuk]

@hua7450 this will affect API partners, we should let them know once HH API is updated