poetry.toml sets virtualenvs.create=false, so pipx poetry installed into
the runner's system Python 3.12 and failed uninstalling Debian packages.
Force venv creation in CI via POETRY_VIRTUALENVS_CREATE. Drop the poetry
cache from release, which never creates a venv.
Install poetry before setup-python and enable the poetry cache so
setup-python activates the 3.14 interpreter. With virtualenvs.create=false
poetry otherwise installs into the runner's system Python 3.12 and fails
uninstalling Debian dist-packages.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bk6CFfaN3YJFZ6yztQja7D
Alexander Myasoedov