# Codex Pass 01 — Backend Foundation

You are implementing GeoIntel Kempen.

Read first:
- AGENTS.md
- docs/DEVELOPMENT_RULES.md
- docs/SERVICE_IO_CONTRACTS.md
- docs/API_EXAMPLE_RESPONSES.md
- docs/SPRINT_BOARD_M4.md

Task:
Build the FastAPI backend foundation only.

Required:
- App factory or clear app entrypoint.
- Settings loader from environment.
- Health endpoint.
- Standard error envelope.
- Database session structure.
- Test setup.
- No GIS-heavy implementation yet.

Acceptance:
- Backend imports cleanly.
- Health endpoint test passes.
- Error envelope test passes.
- TODO and changelog updated.