Add reported health coverage rule inputs

[daphnehanse11]

Closes #7816

Summary

• add person-level reported_*_health_coverage_at_interview input variables for the CPS current-coverage data imported in policyengine-us-data
• default has_esi, has_marketplace_health_coverage, and receives_medicaid from the new reported current-coverage inputs so existing rules can consume the CPS signals without mutating them
• add ACA-facing summary variables for qualifying non-Marketplace coverage and Marketplace/report-model conflicts, plus a Medicaid continuous-coverage regression test using reported Medicaid coverage

Testing

• uv run policyengine-core test policyengine_us/tests/policy/baseline/gov/aca/eligibility/has_qualifying_non_marketplace_health_coverage_at_interview.yaml policyengine_us/tests/policy/baseline/gov/aca/eligibility/coverage_report_model_conflict.yaml policyengine_us/tests/policy/baseline/gov/hhs/medicaid/receives_medicaid.yaml policyengine_us/tests/policy/baseline/gov/hhs/medicaid/medicaid_enrolled.yaml -c policyengine_us
• ./.venv/bin/python -m py_compile policyengine_us/variables/input/health_coverage.py policyengine_us/variables/gov/aca/eligibility/has_esi.py policyengine_us/variables/household/expense/health/has_marketplace_health_coverage.py policyengine_us/variables/gov/hhs/medicaid/receives_medicaid.py policyengine_us/variables/gov/aca/eligibility/has_qualifying_non_marketplace_health_coverage_at_interview.py policyengine_us/variables/gov/aca/eligibility/coverage_report_model_conflict.py

[baogorek]

Nice work — the mixin pattern keeps the input definitions clean, and the test coverage looks solid.

Two things worth double-checking before merge:

1. has_marketplace_health_coverage default flips from True to False. Previously every person defaulted to having marketplace coverage, which fed into is_aca_ptc_eligible. Now it defaults to False (via the reported flag). That's more correct for microsim, but in the web app where users build individual households and don't set the reported flag, this could silently zero out ACA PTC for everyone. Worth confirming that pathway still works as expected.

2. receives_medicaid was an explicit input variable (docstring says it "anchors takeup calibration"). Adding a formula that delegates to the reported flag changes it from a user-settable input to a derived value. Same question: does direct assignment still take priority over the formula in contexts that depend on it?

[MaxGhenis]

use adds

[MaxGhenis]

one variable per file

[MaxGhenis]

frame around reality not surveys. what insurance do they have at the moment?

[MaxGhenis]

this would be a formula right

[MaxGhenis]

isnt this a formula? marketplace + aca_ptc>0? but we should just remove it

[codecov]

Codecov Report

❌ Patch coverage is 98.55072% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.85%. Comparing base (19ec305) to head (fb98831).
⚠️ Report is 163 commits behind head on main.

Files with missing lines	Patch %	Lines
.../expense/health/has_marketplace_health_coverage.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #7821      +/-   ##
===========================================
- Coverage   100.00%   98.85%   -1.15%     
===========================================
  Files            3        6       +3     
  Lines           33       87      +54     
===========================================
+ Hits            33       86      +53     
- Misses           0        1       +1     

Flag	Coverage Δ
unittests	98.85% <98.55%> (-1.15%)	⬇️

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