Computes MAJOR.MINOR.PATCH.BUILD from NEW_MAJOR/NEW_MINOR/NEW_PATCH
whole-line tokens in commit messages since the last release tag.
Non-main branches get a BRANCH-SHORTSHA suffix and never release.
Maintains VERSION.md, writes $GITHUB_OUTPUT, and optionally creates
a Gitea release via API.
Includes spec, 67-assertion test, usage guide (docs/semver-ci.md),
and a drop-in Gitea Actions workflow template.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
