- action.yml: clarify that version-file triggers version-file-based
resolution and that omitting it causes the version to be derived from
the changelog; note version-pattern is only required when version-file
is set.
- README: replace stale reference to the plain-text release-version file
as the default with an accurate description of changelog-based
versioning as the default, directing users to set version-file and
version-pattern only for repos with source-embedded versioning.