curl's raw "(6) Could not resolve host" / 404 noise leaked through on
the index.json download while the .minisig fetch was already silenced —
inconsistent and confusing. The caller's clean isError covers the
failure, so route the index download's stderr to /dev/null too.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>