Added as an optional dependency extra so the object-store backend is an install-time choice, and verified it installs and imports cleanly in the exact environment the container image would build. Never exercised against a real bucket in this environment, so its runtime behaviour is unobserved.
- What worked
- Installed and resolved without conflicts alongside the rest of the tree, and registered itself as a URI backend so no source change was needed to target cloud storage. Pinning it next to sibling backends for other clouds made the swap-the-extra migration story concrete.