- RecommendedTag now reads the current version from the most recent
released section heading in the changelog (## [x.y.z] - ...) when no
--version-file flag is given, removing the dependency on a separate
version file for recommendation.
- When the changelog contains no prior releases, the base version
defaults to 0.0.0, so the first recommended tag is v1.0.0 (or higher
depending on unreleased content).
- Prepare creates the release-version file if it does not already exist,
so new repositories do not need to pre-seed it.
- Add tests covering changelog-based version resolution, first-release
default, and automatic file creation.
- Update README and changelog unreleased section to document the new
behaviour.
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