Implement Oregon Employment Related Day Care

[hua7450]

Closes #8991.

Summary

• implements Oregon Employment Related Day Care (ERDC) eligibility, countable income, copays, and benefits
• encodes all 2026 provider reimbursement rates for Areas A, B, and C
• uses Enum-indexed area, provider-type, age-group, and billing-tier dimensions, consolidating rates into three parameter files
• registers ERDC in Oregon and federal CCDF child care subsidy aggregators

Modeling notes

• or_erdc_provider_area is a direct AREA_A / AREA_B / AREA_C input; ZIP-code mapping is deferred to a follow-up PR
• Area C is the conservative default when no area is supplied
• TANF is listed but commented out of ERDC countable income because adding calculated tanf would create a circular dependency through child care expenses and TANF deductions
• administrative eligibility requirements that cannot be inferred from household inputs remain out of scope

Sources

• OAR Chapter 414, Division 175
• Oregon DELC 2026 ERDC provider rate guide
• Oregon Programs Eligibility Notebook, July 2026

Validation

• 47 focused ERDC YAML tests pass
• 12 parameter syntax, Enum breakdown, system import, and parameter code-health tests pass
• make format and Ruff checks pass
• official provider-rate PDF audit found no value or effective-date mismatches

The broad make test-yaml-structural target was stopped while it was spending several minutes in an unrelated existing contributed-policy batch; the direct parameter structural/import checks and all Oregon tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ff39625) to head (cb96faa).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main     #8993    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files            1        23    +22     
  Lines           18       335   +317     
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+ Hits            18       335   +317     

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

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