[NGI Commons] Milestone 2 — CLI and library path

[safal207]

Goal

Create a stable local evaluation path for PythiaLabs evidence gates.

Deliverables

• Stable local command for evaluating evidence gates.
• Library functions for gate evaluation.
• Consistent decision output.
• Stable stop reasons.
• Basic packaging notes.

Acceptance checks

• Reviewer can run local commands.
• CLI returns deterministic output for fixtures.
• Stop reasons are stable.
• Invalid inputs fail safely.

Grant context

Application: 2026-06-133
Fund: NGI Zero Commons / Commons Fund
Reviewer docs: docs/BUDGET_AND_MILESTONES_COMMONS.md