Copilot instructions

1---
2applyTo: "ai-service/**/*.py"
3---
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5# AI Service Instructions
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7- Keep FastAPI route handlers thin; put reusable behavior in `app/domains`.
8- Use explicit Pydantic request and response models.
9- Preserve strict typing and keep `python -m mypy app` clean.
10- Use `response_model` for API route outputs.
11- Treat extraction and model outputs as explainable signals or candidate data, not clinical decisions.
12- Run `python -m ruff check .` and the relevant `python -m pytest` tests for Python changes.
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