# BUILD ORDER GRAPH — M14 Launch

Codex must follow this dependency graph for implementation.

## Graph

```text
Repository readiness
  -> Environment/config
  -> Backend app foundation
  -> Database/PostGIS foundation
  -> Domain models/schemas
  -> Migrations
  -> Project API
  -> Area API
  -> Dataset API
  -> Storage service
  -> Metadata extraction
  -> Frontend shell
  -> Frontend API client
  -> Map workbench shell
  -> Dataset UI
  -> Fixture layer display
  -> Export baseline
  -> Tests and readiness
```

## Blocked until foundation is stable

The following are blocked until the above graph is green:

- Detection Lab.
- Segmentation Lab.
- QA/QC engine beyond fixture/schema validation.
- Remote Sensing Lab.
- GRB live adapter.
- OSM live adapter.
- LiDAR Workbench.
- Training Studio.

## Rule

If a later module requires missing foundation work, Codex must complete the foundation work first instead of building around it.

## Preferred first implementation passes

### Pass 1 — Backend and config

- Create app structure.
- Add config/settings.
- Add health endpoint.
- Add response envelope and error handling.

### Pass 2 — Database and domain

- Add database connection.
- Add migrations.
- Add core models.
- Enable PostGIS.

### Pass 3 — Project/Area/Dataset API

- Implement CRUD.
- Validate geometry.
- Extract metadata.

### Pass 4 — Frontend shell and map

- React app.
- Layout.
- MapLibre.
- API client.

### Pass 5 — Fixture-driven integration

- Load demo area/reference layer.
- Display layers.
- Run smoke tests.