ekkoBSD 2.1 amd64 repair scripts

Run as root:
  curl -fsSL https://cdn.ekkobsd.org/pub/ekkoBSD/releases/2.1/amd64/scripts/repair-mom-repos.sh | esh

repair-mom-repos.sh configures the official R2/CDN MOM repository at priority
100 and the installation CD repository at priority -100. It preserves the
existing configurations under /etc/mom/repositories-before-r2.* and does not
install, remove, or update packages. Run mom update afterward.

For offline fallback, mount the ekkoBSD installation CD at /mnt2. The repository
must exist at /mnt2/2.1/amd64/mom. MOM verifies the signed index and packages.
A minimal CD contains only its bundled subset, not every online package or
newer update. An absent CD may produce an unavailable-repository warning;
R2 remains the preferred source. No installation-media cache is reused as the
R2 index cache.

An optional absolute target-root argument supports repairing a mounted system:
  esh repair-mom-repos.sh /mnt

SHA256 lists the published repair-script hashes.