The store is found by the seats' holder and its listen registry; list says,
per repository, each manifest's digest, whether it is an index and what it
names, its tags, its size and whether it is held, so the sweep reads the
store through the seat. E15 now asks that nothing is provided or served.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig