pub fn oid_key(oid: &oid) -> Result<Key, StorageError>Expand description
The key the derivation family derives an object’s oid to: [0x03] + the oid bytes, decoded through Key::from_bytes over the physical
encoding — family-explicit, rejects-never-guesses (alkblobs ADR-018;
ADR-020 §Decision 5’s external-oid shape). A non-sha1 oid is
StorageError::Invalid (OQ-05: never silently re-addressed).