# Source of Truth Rules

## Core rule

If it defines the whole system, it belongs in `_QiOS_DNA`.

If it explains how one app works, it can live in that app repo and may also be summarized here under the matching module.

If it is readable operator guidance, it can be published to the docs site or Wiki.js.

If it is generated, exported, summarized, indexed, embedded, or visually rendered, it is not canonical by itself.

## Truth hierarchy

```text
1. Canonical source docs in _QiOS_DNA
2. Child repo implementation docs
3. Database migrations / schemas / runtime config
4. Docs-site or wiki operator pages
5. Generated exports and AI summaries
```

## Raw / canon / export distinction

```text
Raw imports are evidence.
Canonical docs are law.
Exports are snapshots.
```