trace-file-lineage answers "which agent made this file" and ships a grade for "I don't know."

172 stars in three days after a July 29 launch. It ranks candidate producers from static parsing of Python and notebooks, file metadata, git rename history, document structure, image EXIF, and optional shell recording. The design point worth copying is the confidence ladder: verified means proof from a recorded run, then strong-candidate down to weak-signal, and insufficient when the evidence genuinely isn't there instead of a plausible guess. 0.5s first scan at 1,000 files, 16.5s at 10,000.