Poetry?

Consider adding [Poetry](https://python-poetry.org/) to the quickstart/example, rather than basic venv?

No file is named; start by locating the quickstart/example instructions that currently use a basic venv and review the surrounding setup guidance. Done means the example clearly supports Poetry instead of, or alongside, the existing venv approach, with the documentation remaining runnable for new users.

索引モデルが issue の本文から書いたものです。