Availability targets gain an optional probe agent assignment. Setting
it requires the external_probe entitlement, enforced only at the
moment of assignment - local targets never consult the license path.
Assigned targets are delivered to their agent through the signed
agent-config channel, skipped by the local poller, and resume local
execution automatically if the entitlement lapses. Probe-reported
results are accepted only from the currently assigned agent, share
the local failure-threshold accounting, carry source attribution,
and derive to indeterminate at read time when reports go stale.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
courtmanr@gmail.com