Package deleteutil provides shared helpers for the 'opampctl delete' subcommands,
so each resource command only supplies its per-identifier delete call and shares
one consistent success/failure summary.
Run deletes each identifier via del and prints a standard summary. kind is the
singular resource noun used in messages (e.g. "agent", "agentgroup"). It never
returns an error itself: per-identifier failures are reported on stderr so a
partial batch still deletes what it can.