System.cmd :timeout option doesn't exist in Elixir 1.19, causing every
poll to crash silently. Also translate SNMPv2-SMI::enterprises prefix
to numeric OID so the lookup maps match correctly.
Poll UBNT AirFiber radios (AF11X + AF60-LR) every 5 minutes via
net-snmp CLI, storing signal metrics in commercial_samples. Fetches
ASOS weather alongside each cycle for propagation correlation.
Includes 7 seeded link definitions, Oban cron worker, and net-snmp
in the Docker image.
