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name: contrast-solver-helper description: Implement APCA/WCAG2 contrast requirements and solver behavior per src/planning/spec-v0.3.md and src/planning/roadmap-v0.3.md, with minimal tests.

Contrast Solver Helper

Use this skill when implementing or validating contrast logic, APCA/WCAG2 targets, or solver behavior in src/contrast.

Workflow

1. Read src/planning/spec-v0.3.md and the relevant phase in src/planning/roadmap-v0.3.md.
2. Implement contrast evaluation for APCA and WCAG2.
3. Implement solver behavior for targets and failure modes (best-effort vs strict).
4. Add minimal tests for target attainment and failure handling.

Guardrails

• Respect ContrastRequirement and OutputOptions.strict behavior.
• Prefer deterministic solver paths; document edge-case behavior.