Add Medicaid CE short-term hardship exceptions: hospitalization and medical travel

[DTrim99]

Part of #8270 (parent #7751).

Adds two person-level boolean inputs for Medicaid community engagement short-term hardship exceptions and ORs them into the medicaid_work_requirement_eligible exemption set:

• is_hospitalized_for_medicaid_ce — hospitalization or intensive services
• has_long_distance_medical_travel_for_medicaid_ce — long-distance medical travel

Both follow the existing hardship-input pattern (e.g. is_in_medicaid_community_engagement_treatment_program) and default to false, so microsimulation results are unchanged — they let household scenarios represent circumstances the survey data can't signal.

Deferred (per the issue's scope): the county-unemployment-threshold and federal-disaster-declaration hardships require external data (county unemployment rates, disaster declarations); and state-election gating pending the mandatory-vs-state-optional determination.

Tests: added hospitalized → exempt, medical-travel → exempt, and a no-hardship control → subject. medicaid_work_requirement_eligible suite 40/40.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (8326a14) to head (5ab7fbd).
⚠️ Report is 53 commits behind head on main.

Additional details and impacted files

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##              main     #9308   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           12         3    -9     
  Lines          161        65   -96     
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- Hits           161        65   -96     

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

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