Add Nebraska to CCDF program coverage metadata

[PavelMakarchuk]

Summary

Nebraska's Child Care Subsidy is implemented in the model (ne_child_care_subsidy, under gov/states/ne/dhhs/child_care_subsidy, with parameters) but was missing from the CCDF entry in programs.yaml. As a result it doesn't appear on the model coverage page (/us/model/rules/coverage), which is driven by this metadata via api.policyengine.org/<country>/metadata → modelled_policies.

This adds the NE state_implementation and includes NE in the coverage list. CCDF now lists 31 jurisdictions.

- state: NE
  status: complete
  name: Nebraska CCS
  full_name: Nebraska Child Care Subsidy
  variable: ne_child_care_subsidy
  parameter_prefix: gov.states.ne.dhhs.child_care_subsidy

Status note for reviewer

I marked NE complete because it produces an end-to-end subsidy amount plus eligibility variables. If the maintainers consider the Nebraska model still partial (e.g. missing copay/payment-rate detail comparable to other complete states), change status to in_progress or partial.

Context

This is the data-side fix for the stale CCDF coverage shown on the model page. Note the live page is also lagging because the deployed API runs policyengine-us 1.715.2 while main is at 1.730.1 — the other recently-added CCDF states (AL, FL, HI, IA, ID, IN, KS, KY) are already correct in main and will appear once the API is redeployed on a newer release.

Verification

• programs.yaml parses; CCDF now has 31 state implementations and 31 coverage entries.
• ne_child_care_subsidy variable and gov/states/ne/dhhs/child_care_subsidy parameter directory confirmed present on main.
• No tests reference programs.yaml structure; change is metadata-only.

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