Release body now includes conventional-commit bullet points, a compare
link (prev_tag...current_tag) and a link to CHANGELOG.md for both the
GitHub release and a new Gitea release created via API.
GITEA_TOKEN secret must be added to GitHub repo secrets to enable
the Gitea release step.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
