gh pr merge --delete-branch fails mid-batch on worktrees

gh pr merge --squash --delete-branch returns exit 1 when the local branch cannot be deleted because a git worktree has it checked out — even though the remote squash-merge succeeded. Chaining merges with && therefore aborts after the first PR that has a worktree on its head branch, silently skipping the rest. Use ; instead of &&, or pass --delete-branch=false and clean up branches separately after verifying via git worktree list.