[NGI TALER] Milestone 4 — CLI API and integration notes

[safal207]

Goal

Create a clean developer interface and document how ProofPath can connect to privacy-preserving payment flows.

Deliverables

• CLI commands for evaluate, export, and verify.
• OpenAPI contract updates.
• Mock payment rail demo improvements.
• Integration notes for payment adapters.
• Example integration path for an AI-agent workflow.

Acceptance checks

• Reviewer can run an end-to-end demo locally.
• Blocked proposals never execute.
• Accepted proposals are visibly forwarded to mock rail.
• Integration notes identify where a payment adapter would connect.

Grant context

Application: 2026-08-00b
Fund: NGI TALER
Reviewer docs: docs/TALER_ALIGNMENT.md