remove otel.metricIntervalMs and the host-level otel.debug

Both are ignored with a warning through the same shim, now
nix/host-modules/hive-options-removed.nix.

- otel.metricIntervalMs: claude in every agent and hive-c0re's
  container-resource exporter run at the 60s default. The agent-level
  services.hyperhive.agent.otel.metricIntervalMs, set only by the meta
  render, goes too (warning shim in nix/agent-modules/otel-removed.nix).
- otel.debug: services.hyperhive.agent.otel.debug stays, documented and
  set in an agent's own config; the meta render no longer emits it.

nix/host-modules/default.nix

@@ -85,7 +85,7 @@
     ./swarm-victoriametrics.nix
     ./swarm-wireguard.nix
     ./swarm.nix
-    ./c0re-options-removed.nix
+    ./hive-options-removed.nix
     ./host-ca-removed.nix
     ./nats-callout-removed.nix
     ./swarm-required-services.nix