Add BOOST composition test for the Head Start net income switch

changelog.d/boost-head-start-composition-test.changed.md

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+Add a BOOST reform-composition test pinning that Head Start values flow through the reform's static household_benefits list when gov.simulation.include_head_start_benefits_in_net_income is on.

policyengine_us/tests/policy/reform/boost_head_start_benefits_composition.yaml

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+# Head Start values compose into BOOST's static household_benefits list when
+# gov.simulation.include_head_start_benefits_in_net_income is on.
+#
+# Lives under tests/policy/reform (one subprocess per file) rather than
+# contrib/congress/tlaib for the same reason as the ECPA composition case: the
+# congress structural batch runs each proposal directory in a single process at
+# its memory ceiling, and an extra reformed-system variant stalls that job.
+# With administered_through_ssa false, BOOST's household_benefits is the static
+# list alone, so the asserted total isolates the wrapper entry.
+
+- name: Head Start values compose into BOOST household benefits when the inclusion switch is on.
+  period: 2023
+  reforms: policyengine_us.reforms.congress.tlaib.boost.boost_middle_class_tax_credit.boost_middle_class_tax_credit
+  input:
+    gov.contrib.harris.lift.middle_class_tax_credit.in_effect: true
+    gov.contrib.congress.tlaib.boost.middle_class_tax_credit.administered_through_ssa: false
+    gov.simulation.include_head_start_benefits_in_net_income: true
+    age: 30
+    head_start: 8_000
+    early_head_start: 21_000
+    social_security: 0
+    ssi: 0
+    snap: 0
+    wic: 0
+    free_school_meals: 0
+    reduced_price_school_meals: 0
+    child_support_received: 0
+    workers_compensation: 0
+    educational_assistance: 0
+    financial_assistance: 0
+    survivor_benefits: 0
+    acp: 0
+    ebb: 0
+    tanf: 0
+    high_efficiency_electric_home_rebate: 0
+    residential_efficiency_electrification_rebate: 0
+    unemployment_compensation: 0
+    basic_income: 0
+    spm_unit_capped_housing_subsidy: 0
+    household_state_benefits: 0
+  output:
+    household_head_start_benefits: 29_000
+    household_benefits: 29_000