Simple backdating MN TANF

[hua7450]

Summary

Fixes #7203

Adds historical parameter values to Minnesota MFIP (Minnesota Family Investment Program), extending data back to 1998/2016 based on Minnesota State Register filings 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	1998-01-01: 36%, 1999-10-01: 38%, 2015-10-01: 50%
resources/limit.yaml	2016-06-01 (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

Regulatory Sources

• Minnesota House Research - MFIP - Program overview
• Minnesota Combined Manual - MFIP/DWP Assistance Standards - Current standards
• 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

Test Plan

• All 46 MN MFIP tests pass

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f6b4cbb) to head (5789096).
⚠️ Report is 26 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7204   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         3    +2     
  Lines           22        49   +27     
  Branches         1         0    -1     
=========================================
+ Hits            22        49   +27     

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

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