Keep New Hampshire FANF's recipient earned income disregard at 50%

[PavelMakarchuk]

Summary

gov.states.nh.dhhs.fanf.income.earned_income_disregard.recipient_rate changed from 0.5 to 0.75 on 2022-09-01, citing the TANF State Plan's "Cliff Effect Initiative". nh_fanf_countable_earned_income applied that rate to every enrolled unit. The State Plan and DHHS's Cliff Effect Progress Report (March 2023) describe the rate as a voluntary two-year pilot, October 2022 to September 2024. It covered only participants who started or moved to full-time work.

The general rule for recipients is still 50%:

• He-W 654.13(e) says: "The 50% EID shall be used to determine: (1) The eligibility and the benefit amount for current FANF financial assistance recipients". The source note ends "ss by #11186, eff 9-20-16", so the rule was not amended for the pilot.
• FAM 603.01 gives "50% of gross earned income of current recipients".
• The NCCP TANF State Profile 2025/2026 for New Hampshire also gives 50%.

This PR removes the 2022-09-01 value, so the rate is 0.5 throughout. It adds He-W 654.13(e) and the current FAM 603.01 page as references and notes that the pilot is not modeled: the inputs cannot identify pilot participants. The formula comment in nh_fanf_countable_earned_income is updated to match.

Issue example (2025, three people, $1,500/month earnings, enrolled): countable earnings are $750 instead of $375, and nh_fanf is $582.50/month instead of $957.50.

Tests

• integration.yaml:
  • New Case 16 is the issue example in 2025-01: $750 countable and $582.50 benefit.
  • New Case 17: a recipient with $2,700/month earnings has $1,350 countable, which is above the $1,332.50 payment standard, so the unit is ineligible. On main the 25% rate kept it eligible.
• Existing recipient expectations moved from 25% to 50% of earnings: integration.yaml Cases 7, 9, 12 and 15, and nh_fanf_countable_earned_income.yaml Cases 3, 5, 6 and 7. Case 7 now uses $400/month earnings so that it still tests "child care equals after-disregard income".
• The applicant cases (20%) are the control and are unchanged.
• On main, 7 of these cases fail. With the fix, nh/dhhs/fanf has 69 passed and nh/dhhs/ccap has 119 passed.

The related applicant-benefit defect named in the issue is not changed here. He-W 654.13(d) computes the benefit of a new applicant with the 50% disregard.

Fixes #9984

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