# NEXUS v0.6.0

> Deterministic governance for agent-to-agent, agent-to-tool, and agent-to-payment execution. NEXUS is an optional AI SAFE² reference implementation; it is not required for framework conformance and is not production-assured by default.

## Essential

- [Documentation map](DOCUMENTATION.md): Audience and task-based navigation
- [Agent instructions](AGENTS.md): Deterministic interpretation and change rules
- [Machine manifest](nexus-docs.manifest.json): Versioned canonical document index
- [Overview](README.md): Architecture, install, scope, and assurance boundaries
- [Python SDK](sdk/python/README.md): Package installation and minimal example

## Sovereign Payment Gateway

- [Payment profile](payments/README.md): Status, design, controls, and acceptance gates
- [Threat model](payments/THREAT-MODEL.md): Adversaries, risks, and known limits
- [Gateway](payments/SOVEREIGN-GATEWAY.md): Protected execution components
- [Controls](payments/CONTROLS.md): APAY-01 through APAY-20
- [Deployment readiness](payments/DEPLOYMENT-READINESS.md): Evidence-based activation decision
- [Adapter guide](payments/ADAPTER-GUIDE.md): Integration and fail-closed boundaries

## Machine resources

- [Schemas](schemas/): Versioned JSON contracts
- [OPA policy](opa/): Deterministic policy artifacts
- [Examples](examples/): Integration examples
- [Changelog](CHANGELOG.md): Release history