--check warned 'rc worktree would be created' whenever the directory was
absent, implying a plain setup run would create it — but with no rc branch in
existence setup skips it, so the warning described something that would not
happen and asked for action that was not possible. It now reports the branch
state: present, would-create (branch exists), or nothing-to-do (no branch
yet — the first RC cut creates the branch and the build trigger creates the
worktree on demand). Branch detection is read-only, as --check must be.
Ryan Hughes
db816061a6