Today's cleanup surfaced 14 branches that existed on GitHub but had
been deleted on Gitea — the previous `--all --force` + `--tags --force`
pair pushes refs but never deletes missing ones, so the mirror drifted
over time.
Switching to `git push --mirror` (equivalent to --all --tags --prune
--force) makes the GitHub side a true reflection of Gitea: branch and
tag deletes propagate automatically.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
