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/otel.nix

@@ -158,18 +158,6 @@ in
       '';
     };
 
-    debug = lib.mkOption {
-      type = lib.types.bool;
-      default = false;
-      description = ''
-        Emit OTEL SDK diagnostic messages to every agent's stderr by
-        setting `CLAUDE_CODE_OTEL_DIAG_STDERR=1`. Useful when
-        troubleshooting collector connectivity or endpoint config;
-        leave off in normal operation to avoid noise in agent logs.
-        Only meaningful when `enable` is true.
-      '';
-    };
-
     collector.upstreamHeaderName = lib.mkOption {
       type = lib.types.str;
       default = "Authorization";
@@ -306,23 +294,6 @@ in
         copied into the store and never passed in argv.
       '';
     };
-
-    metricIntervalMs = lib.mkOption {
-      type = lib.types.nullOr lib.types.ints.positive;
-      default = null;
-      example = 10000;
-      description = ''
-        Metric export interval in milliseconds, set as
-        `OTEL_METRIC_EXPORT_INTERVAL` for every agent. Claude Code's
-        default is 60000 (60s). Leave `null` to use that default.
-
-        Each agent runs claude as a short-lived per-turn process; claude
-        force-flushes metrics on shutdown, so this is not required for
-        metrics to be exported, but a lower value gives more frequent
-        intermediate flushes within long turns. Cosmetic, not a
-        correctness knob.
-      '';
-    };
   };
 
   config = lib.mkIf config.services.hyperhive.otel.enable (