- Move the monolithic pkgmgr/actions/release.py implementation into the
pkgmgr.actions.release package, splitting concerns into versioning,
git_ops and files helpers.
- Extend the release orchestration to update Fedora/RPM %changelog
entries via update_spec_changelog(), reusing the same effective
release message as for CHANGELOG.md and debian/changelog.
- Wire the new update_spec_changelog() helper into _release_impl() so
every release keeps project, Debian and RPM metadata in sync.
- Add unit tests for update_spec_changelog() and for the updated release
orchestration behaviour in preview and real modes.
- Remove the deprecated pkgmgr/actions/release.py module.
See ChatGPT discussion: https://chatgpt.com/share/6938368e-0940-800f-92d3-f2ccfddab794
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