fix: regenerate poetry.lock to match pyproject.toml after dev/alpha merge

The merge from dev/alpha brought in pyproject.toml changes that diverged
from the existing lock file, causing all CI jobs to fail at poetry install.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UoPMXqbNjyPL5XmUrYiojm

Author: claude