The dedup cache (.bincio_cache.json) persists source hashes across runs.
If the activities/ directory is wiped (--fresh in another session, or macOS
clearing /tmp after a restart) while the cache file survives at the user dir
level, re-running extract skips all files as "already extracted" and leaves
activities/ empty. Now only hashes whose corresponding .json file is present
on disk are treated as known, so missing files are always re-extracted.
Davide Scaini
c077fceba6