Update PolicyEngine US to 1.634.9

[policyengine]

Summary

Update PolicyEngine US from 1.633.2 to 1.634.9.

What changed (1.633.2 -> 1.634.9)

Added

• Add federal SSI living arrangement statuses and ISM/PMV framework.

Changed

• Use heating_expense_person for LIHEAP expense cap in DC and MA.
• Replace Illinois LIHEAP simplified min/max payment model with full benefit matrix by fuel type, income bracket, and household size.
• Expose build metadata helpers for US data artifacts, including a stable data-build fingerprint and build provenance metadata.

Fixed

• Fix MSP rules to use SSI spouse deeming, applicant-plus-spouse resources, strict SLMB/QI boundaries, category-consistent MSP eligibility, and complete 2021-2026 Medicare/MSP premium and resource thresholds.
• Remove hard-coded end dates from CRFB Social Security credit and senior deduction extension reforms.
• Made has_tin the canonical TIN variable while keeping has_itin and taxpayer_has_itin as compatibility aliases during migration.
• Fixed federal and reform CTC gating so child CTC, ODC, and reform overrides all follow the intended child-qualification and filer-identification rules, and introduced has_tin / taxpayer_has_tin compatibility variables for the TIN-side checks.
• Fixed MA LIHEAP expense cap to include fuel oil expenses and bypass cap for heat-in-rent households.
• Gate the federal child CTC amount on ctc_qualifying_child so dependents who fail the child-specific identification requirement no longer receive the $2,000 child amount.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.97%. Comparing base (39d6550) to head (d6453b7).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3407   +/-   ##
=======================================
  Coverage   72.97%   72.97%           
=======================================
  Files          56       56           
  Lines        2598     2598           
  Branches      460      460           
=======================================
  Hits         1896     1896           
  Misses        617      617           
  Partials       85       85           

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