download.rs carried two clients in one file: the plain transfer
plumbing and a full OCI Distribution Spec client (token auth,
manifest lists, layer blobs). The registry half moves to its own
module; download.rs keeps hashing, checksum files and file
transfers. fetch_oci_digest moves with it; rootfs imports it from
the new home. No behavior change.
The founding rule restated SPEC.md, which stays the source of truth
for the confinement budget. Commit bodies gain a length cap, and a
commit must build and work on its own; bisectability outranks the
one-component-per-commit split when the two collide.
vhaudiquet
Valentin Haudiquet