Migrate my_friend_ben fixture off removed medical_out_of_pocket_expenses

[hua7450]

Summary

Migrates the my_friend_ben customer-household integration fixture off the input variable medical_out_of_pocket_expenses, which is removed in policyengine-us 1.673.0+. Sends other_medical_expenses instead — the load-bearing replacement for non-premium medical spending.

Unblocks #1491 (the weekly policyengine-us 1.663.0 → 1.686.0 bump), whose CI currently fails because tests/integration_with_auth/test_customer_inputs.py::TestCustomerInputs::test_my_friend_ben returns HTTP 500 / VariableNotFoundError when the engine receives the removed variable.

Why the change is needed

policyengine-us PR PolicyEngine/policyengine-us#8178 ("Decompose SPM MOOP premiums") removed the umbrella medical_out_of_pocket_expenses Person variable. It was previously adds = ["health_insurance_premiums", "other_medical_expenses"] — a convenience aggregate. Each statutory program (IRS §213 itemized, SNAP, HUD, Medicaid medically-needy, PA CCW, SPM MOOP) now has its own program-specific aggregate that follows its own legal definition, all of which read other_medical_expenses (and a premium variable) directly.

The granular pieces — other_medical_expenses, health_insurance_premiums_without_medicare_part_b, over_the_counter_health_expenses — have existed since PolicyEngine/policyengine-us#4997 (September 2024), so this migration carries no semantic loss. The fixture's prior value was 0, so the substitution is exact regardless.

Partner impact

Customers (e.g., MyFriendBen) sending medical_out_of_pocket_expenses in household payloads need the same migration. A separate partner notice covers the full mapping. For most cases, the substitution is medical_out_of_pocket_expenses → other_medical_expenses; if the value also represented premiums, send health_insurance_premiums alongside.

Files

• tests/data/customer_households/my_friend_ben.py — rename input key
• changelog.d/migrate-medical-out-of-pocket-expenses-fixture.changed.md — fragment

Test plan

• pytest tests/integration_with_auth/test_customer_inputs.py::TestCustomerInputs::test_my_friend_ben passes locally against policyengine-us 1.686.0 (previously failed with VariableNotFoundError)
• All 4 customer-input integration tests pass (my_friend_ben, amplifi×2, impactica)
• All 223 unit tests pass
• ruff format --check clean
• CI passes
• After merge: rebase Weekly policyengine-us update #1491 onto main so its CI re-runs against this fix

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