The schedules table builds a column per target, including agents that
have since been destroyed (their past schedules linger). Those columns
showed identically to live agents, so the operator couldn't tell a
schedule still targets something that no longer exists.
Flag them: renderSchedulesTableHead now checks each agent column against
the live roster (containersState) and, for any that isn't there (and
isn't 'operator', which is always valid), greys + strikes through the
column label and titles it 'no longer exists (gone)'. The rows stay
visible + cancellable — the operator can see the stale targets and clear
them rather than be surprised by phantom columns. Build green.
0dc85e8261