Add Tennessee TANF (Families First) - Simplified Implementation

[hua7450]

Summary

Work in progress implementation of Tennessee TANF (Families First) program.

Fixes #6826

Status

• [ ] Documentation collected
• [ ] Parameters created
• [ ] Variables implemented
• [ ] Tests written
• [ ] CI passing

Implementation Type

This is a simplified TANF implementation following the pattern established by Washington TANF and other state programs.

Branches

This PR will integrate:

• test-tn-tanf-20251111: Test suite (pending)
• impl-tn-tanf-20251111: Implementation (pending)

---

This is a draft PR created automatically. Implementation work is in progress.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 65.87302% with 43 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 65.87%. Comparing base (66a73e5) to head (1b18923). :warning: Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...tes/tn/dhs/ff/eligibility/tn_ff_income_eligible.py	47.36%	10 Missing :warning:
...yengine_us/variables/gov/states/tn/dhs/ff/tn_ff.py	57.89%	8 Missing :warning:
...gov/states/tn/dhs/ff/eligibility/tn_ff_eligible.py	60.00%	6 Missing :warning:
.../states/tn/dhs/ff/income/tn_ff_countable_income.py	64.28%	5 Missing :warning:
...tes/tn/dhs/ff/income/tn_ff_child_care_deduction.py	69.23%	4 Missing :warning:
...les/gov/states/tn/dhs/ff/tn_ff_payment_standard.py	71.42%	4 Missing :warning:
.../tn/dhs/ff/eligibility/tn_ff_resources_eligible.py	75.00%	3 Missing :warning:
.../tn/dhs/ff/income/tn_ff_countable_earned_income.py	75.00%	3 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##            master    #6827       +/-   ##
============================================
- Coverage   100.00%   65.87%   -34.13%     
============================================
  Files            2        9        +7     
  Lines           38      126       +88     
  Branches         3        0        -3     
============================================
+ Hits            38       83       +45     
- Misses           0       43       +43     

Flag	Coverage Δ
unittests	65.87% <65.87%> (-34.13%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.