Use shared childcare attendance inputs in CalWORKs child care

[hua7450]

Summary

Replaces the CA-only ca_calworks_child_care_days_per_month and ca_calworks_child_care_weeks_per_month inputs with the shared childcare_attending_days_per_month and childcare_days_per_week variables. The CA-only variables were int inputs with no default, so the default WEEKLY billing category multiplied every California child care payment (CalWORKs Stage 1, Stage 2, Stage 3, and CAPP) by a coefficient of 0.

Fixes #9286

Changes

• ca_calworks_child_care_time_coefficient now reads the shared attendance inputs that 17 other state child care programs already use:
  • HOURLY: childcare_hours_per_day × childcare_attending_days_per_month (hours input was already shared)
  • DAILY: childcare_attending_days_per_month
  • WEEKLY: 52/12 weeks per month when attendance is reported through either shared input, following the existing WEEKS_IN_YEAR / MONTHS_IN_YEAR idiom in LA CCAP (la_ccap_monthly_days); zero when no attendance is reported
  • MONTHLY: unchanged (coefficient 1)
• Deletes ca_calworks_child_care_days_per_month and ca_calworks_child_care_weeks_per_month (their only reader was the coefficient formula; verified with a repo-wide sweep)
• Adds integration tests that exercise the default (weekly) billing path without pinning ca_calworks_child_care_time_category: MONTHLY, which every prior money test did — including a case asserting the weekly ceiling payout ($227.58 × 52/12 = $986.18 for a part-time three-year-old at a child care center) and a case documenting that no attendance inputs still means $0

Partner impact

The API partner has been informed and approved this change: their integration pins ca_calworks_child_care_time_category: MONTHLY, which bypasses the changed branch entirely. The partner contract tests under tests/policy/baseline/partners/analytics_coverage/edge_cases/state/ca/ are untouched and pass unchanged. Note this also does not change microsimulation output: the shared attendance inputs are zero across the Populace microdata, as they are for every other attending-days state.

Testing

• 53 CalWORKs Stage 1 child care tests pass (tests/policy/baseline/gov/states/ca/cdss/tanf/child_care)
• 49 Stage 2 / Stage 3 / CAPP tests pass (tests/policy/baseline/gov/states/ca/cdss/child_care)
• 3 CA partner contract tests pass with no edits to the partner file

Checklist

• Tests pass locally
• Code formatted (ruff)
• Changelog entry created

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (724e795) to head (3540ad3).
⚠️ Report is 29 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines           35        17   -18     
  Branches         2         0    -2     
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- Hits            35        17   -18     

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

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