verify.py and generate_pack.py must reach the same verdict on the same
file, and CLAUDE.md calls any divergence critical, but each spelled out
mode == 'existence' in its own words. Both now ask nativemode whether
the frontend reads the file's bytes, which is the one fact the rest
follows from, and a test holds the two answers together.
The BaseScraper contract the wiki asks contributors to implement had no
caller anywhere, so nothing proved compare_with_config, has_changes or
test_connection still worked.
