Simple backdating Minnesota TANF

[hua7450]

Summary

Fixes #7203

Adds historical parameter values to Minnesota MFIP (Minnesota Family Investment Program), extending data back to 2014/2016 based on Minnesota State Register filings, DHS Combined Manual archives, and statutes.

Changes

Parameters Updated

Parameter	Historical Values Added
transitional_standard/amount.yaml	2016-10-01 values for family sizes 1-10
transitional_standard/additional_person.yaml	2016-10-01: $174, 2017-10-01: $172, 2019-10-01: $174 (renamed from additional_person_increment.yaml)
transitional_standard/max_unit_size.yaml	1998-01-01 (was 2024-10-01)
income/family_wage_level_multiplier.yaml	1998-01-01 (was 2020-01-01)
income/earned_income_disregard/flat_amount.yaml	2015-10-01 (was 2020-01-01)
income/earned_income_disregard/rate.yaml	2014-01-01: 43%, 2014-10-01: 50%
income/deductions/child_support.yaml	2016-01-01 (was 2020-01-01), added period: month metadata
income/deductions/dependent_care.yaml	1998-01-01 (was 2020-01-01)
resources/limit.yaml	2015-02-01 (was 2020-01-01)

Files Reorganized

Old Path	New Path
income/child_support_disregard/amount.yaml	income/deductions/child_support.yaml
income/deductions/dependent_care/amount.yaml	income/deductions/dependent_care.yaml

Variables Updated

• mn_mfip_child_support_income_exclusion.py - Updated parameter path
• mn_mfip_dependent_care_deduction.py - Updated parameter path
• mn_mfip_transitional_standard.py - Updated to use additional_person parameter

Tests Added

• Added 4 historical period tests for transitional standard:
  • Case 6: Family of 3 in 2017-01 (2016-10-01 params) = $991
  • Case 7: Family of 12 in 2017-01 (2016-10-01 params) = $2,636
  • Case 8: Family of 3 in 2018-01 (2017-10-01 params) = $984
  • Case 9: Family of 12 in 2018-01 (2017-10-01 params) = $2,614

Regulatory Sources

• Minnesota House Research - MFIP - Program overview
• Minnesota Combined Manual - MFIP/DWP Assistance Standards - Current standards
• Minnesota DHS Combined Manual 0018.18 - Earned Income Disregards (January 2014) - Historical 43% disregard rate
• MN State Register Vol. 41, No. 8 - October 2016 COLA
• MN State Register Vol. 42, No. 9 - October 2017 COLA
• MN State Register Vol. 43, No. 9 - October 2018 COLA
• MN State Register Vol. 44, No. 8 - October 2019 COLA
• MN Stat. 256P.06, Subd. 3 - Child support disregard
• MN Stat. 256P.02, Subd. 2 - Asset limit ($10,000 effective Feb 1, 2015)

Test Plan

• All MN MFIP tests pass (including 4 new historical period tests)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (60c5dcc) to head (bf72805).
⚠️ Report is 25 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##             main     #7204       +/-   ##
============================================
+ Coverage   73.76%   100.00%   +26.23%     
============================================
  Files        3666         3     -3663     
  Lines       52712        49    -52663     
  Branches      263         0      -263     
============================================
- Hits        38882        49    -38833     
+ Misses      13815         0    -13815     
+ Partials       15         0       -15     

Flag	Coverage Δ
unittests	100.00% <100.00%> (+26.23%)	⬆️

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