GitHub's generate-notes lists merged pull requests since the last
published release. A fork merges none, so the stable draft body was only
a "Full Changelog" link, and it lost the HERMES_BUILDS_TABLE marker that
the stable workflow renders the download tables into.
The cut now builds the body with generate_changelog() over the commits
from the published stable commit (or the seed version's tag before the
first publication) to the cut commit.
c0bd183eef