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16 changes: 16 additions & 0 deletions CLAUDE.md
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# CLAUDE.md

## Python environment

- Always use the project's virtual environment in `.venv/` — never install packages into the global Python.
- If `.venv/` doesn't exist yet, create it and install the project with dev dependencies:
```bash
python -m venv .venv
.venv/Scripts/python -m pip install -e ".[dev]" # Windows; on Linux/macOS: .venv/bin/python
```
- Shell state doesn't persist between commands, so call the venv's executables directly instead of relying on `activate`:
```bash
.venv/Scripts/python -m pytest -q
.venv/Scripts/python -m flake8 .
.venv/Scripts/python -m streamlit run app.py
```