v0.8.1

Highlights

• Refreshes docs/new-features.md into a current roadmap/status page so shipped Celery compatibility work is no longer presented as future work.
• Modernizes package license metadata to SPDX-style license and license-files fields.
• Removes the deprecated license classifier, eliminating the setuptools build deprecation warnings seen during the 0.8.0 release build.

Published to PyPI by the tag workflow.