Implement Alaska State Supplementary Payment (SSP)

[hua7450]

Summary

Implement Alaska's State Supplementary Payment (SSP) program for SSI recipients.

Background

Alaska provides a state supplement to federal SSI benefits. Alaska's SSP is state-administered and provides additional monthly payments to SSI-eligible individuals and couples.

Tasks

• Add Alaska SSP eligibility variable
• Add Alaska SSP benefit amount parameters
• Add Alaska SSP benefit calculation variable
• Add tests
• Add to spm_unit_benefits.py
• Add to programs.yaml
• Add changelog entry