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Codex Instructions — anomaly-detector

Read docs/CONTEXT.md and follow it.

Engineering rules

Python src layout: src/anomaly_detector
Minimal deps: numpy/pandas/scikit-learn/typer/rich/pydantic
Add tests for core logic (pytest)
Keep functions small, readable; add type hints where helpful
Update README with runnable examples using poetry run ...

Definition of done (MVP)

Implement these modules and keep them simple:

data/synth.py: synthetic multivariate telemetry + labelled anomaly intervals (ground truth)
detectors/rolling_zscore.py: baseline rolling z-score detector + conversion to predicted intervals
evaluation/event_metrics.py: event precision/recall/F1 for interval detection
streaming/replay.py: sequential replay that emits alerts with context windows
cli.py: Typer CLI commands:
- generate-data
- run-stream
- evaluate

Non-goals

No flight-control logic, no claims about certification/DO-178C compliance
Avoid excessive dependencies and over-complicated architectures