Update Colorado SSI supplement standards for 2026

[MaxGhenis]

Summary

• Add 2026 Colorado OAP grant standard of $1,032/month.
• Add 2026 Colorado AND-CS state supplement grant standard of $994/month.
• Add focused 2026 YAML regression cases for both variables.

Source

Colorado Secretary of State, 9 CCR 2503-5, rule version 12428:

• Section 3.530(A): total monthly OAP grant standard is $1,032 effective January 1, 2026.
• Section 3.546(A): total AND-CS grant standard is $994 effective January 1, 2026.

Validation

• uv run python -m policyengine_core.scripts.policyengine_command test policyengine_us/tests/policy/baseline/gov/states/co/ssa/oap/co_oap.yaml policyengine_us/tests/policy/baseline/gov/states/co/ssa/state_supplement/co_state_supplement.yaml -c policyengine_us
• git diff --check

This was exposed by the Axiom Populace parity comparator: current published PE-US is $27/month low for the 2026 Colorado OAP and AND-CS standards. With this branch installed as the oracle, the Axiom comparison passes with 0 mismatches over 4,418 compared values.