Git branch -a --format=%(refname:short) returns remote branches as
'origin/branch-name', not 'remotes/origin/branch-name'. The code was
only filtering 'remotes/' prefix, causing clone to fail with branch
names like 'origin/feat/foo'.
Now properly detects remote names using 'git remote' and strips the
remote prefix (e.g., 'origin/') from branch names.
alex