pre no longer builds a bare serve.git mirror, moves refs or sets
allowAnySHA1InWant. The repo-local insteadOf now rewrites the official
URLs directly to --source, so updates follow the fork's main (force-push
it to the branch under test). post still undoes the redirect via the
clone/snapshot restore.
--ref is removed: neither hermes update nor the tester's pre-branch
desktop can follow another branch through config the kit could set
without the mirror. pre now ls-remotes --source's main before writing
anything, so a bad source aborts with nothing done. The stale
global-redirect cleanup is dropped: it only matched serve.git paths.
a5bd7e574e