The python/poetry.lock file was silently regenerated by Poetry 2.2.1, upgrading lock-version from 2.0 to 2.1, but the project's .tool-versions pins Poetry to 1.8.5 — which cannot read lock-version 2.1 files and will raise an incompatibility error on 'poetry install'. To fix, either update .tool-versions (and all CI workflows that read it) to require Poetry 2.1+, or regenerate python/poetry.lock using Poetry 1.8.5.