# Documentation index

Purpose: navigate maintained, authoritative project documentation. Do not list nonexistent files.

## Product and delivery

- [Product brief](product/brief.md) - [current / proposed; remove if absent]
- [Current implementation plan](plans/feature-name.md) - [remove if absent]

## Architecture and contracts

- [Architecture overview](architecture/overview.md) - [current or proposed view]
- [Service catalog](architecture/services.md) - [platforms only, if maintained]
- [API contracts](api/overview.md) - [if maintained]
- [Data ownership](data/overview.md) - [if maintained]

## Security and operations

- [Security/tenancy](security/tenancy.md) - [if relevant]
- [Operations runbook](operations/runbook.md) - [if operated]

## Decisions

- [Architecture decision records](adr/) - [accepted/superseded decisions, if the folder exists]

## Documentation lifecycle

The owners of affected changes update related docs, diagrams, and checks together. Do not label planned components as deployed.