Headless multi-application, multi-tenant user management engine.

## Development

```bash
make test
```

See `docs/development.md`, `docs/configuration.md`, `docs/contracts.md`,
`docs/examples.md`, `docs/scenarios.md`, `docs/operability.md`,
`docs/release.md`, `docs/ui-contracts.md`, and `docs/final-assessment.md`
for implementation boundaries, contracts, examples, and release readiness.