The 12 synthetic malformed fixtures (generate_test_corpus.py output, tracked in
PROVENANCE.md) existed only as untracked files and were swept by a cleanup stash,
breaking the provenance pre-commit hook for all commits. Restore from stash and
commit them as tracked files so they cannot be lost again.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
