Remove the inert federal CCDF implementation

[hua7450]

Summary

Removes the inert federal CCDF implementation under gov/hhs/ccdf/. The "federal" encoding was legacy New York data (market rates, copay percentages, county clusters), and the whole subsystem contributed $0 to every household: spm_unit_ccdf_subsidy is not listed in child_care_subsidy_programs.yaml or any benefit aggregate. New York now has a proper state implementation (#9282) that reads none of these files.

Fixes #9283

Changes

Commit 1 — inert NY legacy:

• Variables: ccdf_age_group, ccdf_market_rate, ccdf_county_cluster, spm_unit_ccdf_subsidy, spm_unit_total_ccdf_copay, is_ccdf_home_based, and the orphan input stubs is_ccdf_initial_income_eligible, is_ccdf_continuous_income_eligible
• Parameters: amount.yaml (NY market rates), copay_percent.yaml, county_cluster.yaml
• Their 5 test files under tests/policy/baseline/gov/hhs/ccdf/

Commit 2 — the eligibility chain:

• Variables: is_ccdf_eligible, is_ccdf_income_eligible, is_ccdf_reason_for_care_eligible, ccdf_income_to_smi_ratio, ccdf_income, and their 5 test files
• Prose touch-ups in NY CCAP and SD CCA files that named the deleted variables
• The intermediate CI run at this commit failed exactly on Household API Partners, confirming the partner contract tests guard this surface

Commit 3 — partner test update:

• Deleted edge_cases/federal/childcare/ccdf/federal.yaml and ccdf/ma.yaml (existed solely to contract-test the removed chain)
• signatures/ma.yaml: removed 20 is_ccdf_eligible output pins and 20 is_ccdf_reason_for_care_eligible input lines
• 7 Head Start edge-case files: removed 38 inert is_ccdf_reason_for_care_eligible input lines (nothing reads them; no expected outputs change)

Partner impact

The API partner was informed and approved removing is_ccdf_eligible (appears in their requests as an output) and is_ccdf_reason_for_care_eligible (as an input).

Kept — genuinely shared federal infrastructure

is_ccdf_asset_eligible (38 state readers), is_ccdf_immigration_eligible_child (41), meets_ccdf_activity_test (29), is_enrolled_in_ccdf, is_ccdf_age_eligible, child_care_subsidies, ccdf_duration_of_care (Idaho ICCP), and the shared parameters (asset_limit, age_limit, income_limit_smi — read by MO CCS, child_care_subsidy_programs).

Testing

• All 619 partner tests pass locally after the update (8-shard parallel run, zero failures)
• 23 remaining gov/hhs/ccdf tests, 119 NY CCAP, 151 SD CCA, and 69 Idaho ICCP tests pass
• Repo-wide sweep confirms no remaining references to any deleted name

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.24%. Comparing base (724e795) to head (5c891e7).
⚠️ Report is 29 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##              main    #9355       +/-   ##
============================================
- Coverage   100.00%   67.24%   -32.76%     
============================================
  Files            1        3        +2     
  Lines           35       58       +23     
  Branches         2        0        -2     
============================================
+ Hits            35       39        +4     
- Misses           0       19       +19     

Flag	Coverage Δ
unittests	67.24% <ø> (-32.76%)	⬇️

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