# Codex Phase 3 Prompt — Detection + QA/QC Skeleton

Read first:

- `docs/DETECTION_PIPELINE_SPEC.md`
- `docs/QA_QC_SPECIFICATION.md`
- `docs/AI_PIPELINES.md`
- `docs/DATABASE_SCHEMA.md`

## Mission

Build the detection pipeline contracts and QA/QC engine foundation.

## Required features

- Detection analysis run model/API.
- Detection storage model/API.
- Model registry skeleton.
- Tile metadata structures.
- Pixel bbox to geospatial polygon utility.
- IoU calculation utility.
- One-to-one polygon matching utility.
- Precision/recall/F1 calculation.
- GeoJSON export for detections and QA outputs.

## Rules

- Do not fake YOLO inference if no model is available.
- It is acceptable to implement the model adapter interface and readiness checks first.
- QA/QC utilities must be testable with fixture polygons.