The hive collector's only exporter becomes the swarm's collector, and
the upstream credential, the metrics-store exporter and the choice of
destination all move one tier up.
Its assertion goes with them: 'endpoint or a local store' was the right
rule while this tier picked the destination, and is the wrong one now.
A hive that runs no swarm services has neither, forwards to a swarm
collector elsewhere, and is correctly configured — the rule that
replaces it lives in swarm-otel.nix, where the destinations are.
The option descriptions here described a topology with one collector in
it: endpoint and protocol are not what agents are handed (they get the
derived first hop, see hive-c0re/environment.nix), and the credential is
not read by this tier.
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