CLAUDE.md and docs/release-channels.md now describe the full cycle: work
lands on feature/fix branches merged into dev, dev auto-publishes on every
push, beta is cut from dev as a frozen stabilization branch (also
auto-publishing on every push, fixes forwarded from fix/<issue> branches),
and after a quiet freeze period beta merges to main and gets tagged for
the actual stable release. Also fixes README's stale reference to
.github/workflows (actual CI lives under .forgejo/workflows) and links
out to the new CONTRIBUTING.md.
