HealthLog defines no Server Actions, so no bundle of it, current or
stale, sends a Next-Action header. The requests that do arrive come from
the nightly scan probing that surface, and Next answered each with an
unstructured "Failed to find Server Action" at error level. The proxy
now refuses them with a 404 and one structured warn line, and a guard
keeps "use server" out of the tree so the refusal stays safe.
