credit-note-fixer

# Credit Note Fixer Follow this workflow: 1. Read `repo/task.md`. 2. Inspect `repo/credit_note.sh` and `repo/tests/test_credit_note.sh`. 3. Make the smallest correct change that keeps the output label as `credit` and the amount positive. If you use `apply_patch`, use workspace-root-relative paths such as `repo/credit_note.sh` and `repo/tests/test_credit_note.sh`. 4. Run exactly `sh tests/test_credit_note.sh` from `repo/`. 5. In the final answer, summarize the bug, the fix, and the exact verification command.