Clean up NY-specific federal CCDF variables and parameters

[hua7450]

Summary

The federal CCDF directory (gov/hhs/ccdf/) contains a mix of truly federal variables and NY-specific implementations. No state CCAP implementation (MA, CO, TX, CA, NE) currently uses any of these federal variables. This issue tracks cleaning up the NY-specific files and making the federal layer actually reusable.

Related: #7764 (federal CCDF infrastructure), PR #7765

Current State

NY-specific files (not generalizable)

Variables:

• ccdf_market_rate.py — NY market rates only
• spm_unit_total_ccdf_copay.py — NY county copay percentages
• ccdf_county_cluster.py — Maps NY counties to 5 clusters
• ccdf_age_group.py — NY OCFS age cutoffs (different for home vs center)
• ccdf_duration_of_care.py — NY OCFS duration definitions
• spm_unit_ccdf_subsidy.py — Uses NY-specific market rate and copay
• is_ccdf_home_based.py — Used by NY age group logic

Parameters:

• amount.yaml — NY market rates (5 clusters × 5 provider types × 4 durations × 4 age groups)
• copay_percent.yaml — All 62 NY counties with copay percentages
• county_cluster.yaml — NY county-to-cluster mapping
• age_limit.yaml — Only has NY-dated value (2021-10-01)

Stub variables (no formulas)

• is_ccdf_initial_income_eligible.py — Empty, no formula
• is_ccdf_continuous_income_eligible.py — Empty, no formula
• is_enrolled_in_ccdf.py — Empty, no formula
• meets_ccdf_activity_test.py — Empty, intentionally a stub (states implement their own)
• ccdf_income.py — Only adds = ["market_income"], undocumented

Working federal variables (keep as-is)

• is_ccdf_asset_eligible.py — $1M federal limit, truly universal
• is_ccdf_immigration_eligible_child.py — Federal qualified alien list (added in PR Add federal CCDF infrastructure for scaling CCAP to all states #7765)
• is_ccdf_age_eligible.py — Under 13 federal default
• is_ccdf_income_eligible.py — 85% SMI federal ceiling
• is_ccdf_eligible.py — Composite eligibility
• is_ccdf_reason_for_care_eligible.py — Activity test or protective services
• ccdf_income_to_smi_ratio.py — Income/SMI ratio calculation
• child_care_subsidies.py — Federal aggregator (added in PR Add federal CCDF infrastructure for scaling CCAP to all states #7765)

Proposed Actions

• Move NY-specific variables/parameters to gov/states/ny/ (or create ny_ccdf / ny_child_care_subsidies)
• Decide whether to keep or remove stub variables (initial_income_eligible, continuous_income_eligible, is_enrolled_in_ccdf)
• Update age_limit.yaml to use proper federal effective date instead of NY-specific 2021-10-01
• Document ccdf_income.py or replace with proper income definition
• Ensure meets_ccdf_activity_test is clearly marked as an intentional input stub