The previous fix only cleaned papers/ before rebase, but the papers-git-poller rewrites .last-papers-built-hash at the repo root every cycle, leaving that file dirty and still blocking the rebase. Switch from \`git checkout -- papers/\` to \`git checkout -- .\` so the cleanup covers the whole working tree. We've already committed the PDFs we care about at this point; everything else left unstaged is either LaTeX build artifacts or poller state.