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/agent-modules/claude-settings.nix

@@ -219,7 +219,7 @@ in
           baseClaudeEnv
           // lib.optionalAttrs otelCfg.enable otelSettingsEnv
           // lib.optionalAttrs (otelCfg.enable && otelCfg.debug) {
-            # SDK diagnostics — noisy; only on when services.hyperhive.otel.debug = true.
+            # SDK diagnostics — noisy; only on when services.hyperhive.agent.otel.debug = true.
             CLAUDE_CODE_OTEL_DIAG_STDERR = "1";
           };
       in

nix/agent-modules/default.nix

@@ -51,6 +51,7 @@ in
     ./memory-cap.nix
     ./network.nix
     ./otel.nix
+    ./otel-removed.nix
     ./packages.nix
     ./queue.nix
     ./queue-identity.nix

nix/agent-modules/otel-removed.nix

@@ -0,0 +1,27 @@
+# Removal shim for `services.hyperhive.agent.otel.metricIntervalMs`.
+#
+# A definition is ignored and produces a warning, so an agent config, or a
+# meta flake rendered before the option went, keeps evaluating. claude runs
+# at the OTEL SDK's default export cadence.
+#
+# Self-contained and deletable: one file to remove when the deprecation
+# window closes.
+{ lib, config, ... }:
+let
+  value = config.services.hyperhive.agent.otel.metricIntervalMs;
+in
+{
+  options.services.hyperhive.agent.otel.metricIntervalMs = lib.mkOption {
+    type = lib.types.nullOr lib.types.ints.positive;
+    default = null;
+    visible = false;
+    internal = true;
+    description = "Removed and ignored. `null` is \"not set\".";
+  };
+
+  config.warnings = lib.optional (value != null) ''
+    services.hyperhive.agent.otel.metricIntervalMs is removed and ignored:
+    claude exports metrics at the SDK default of 60 seconds. Remove this
+    setting.
+  '';
+}

nix/agent-modules/otel.nix

@@ -1,5 +1,6 @@
 # OpenTelemetry wiring for an agent container: the per-agent options the
-# meta flake injects (host-driven from `services.hyperhive.otel.*`), the
+# meta flake injects (host-driven from `services.hyperhive.otel.*`) plus
+# `debug`, which the agent's own config sets, the
 # environment every OTLP producer inside the container reads, and the
 # collector that forwards this container's journal to the hive.
 #
@@ -62,9 +63,6 @@ let
     # silently drop without a deltatocumulative processor.
     OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE = "cumulative";
     OTEL_RESOURCE_ATTRIBUTES = resourceAttributes;
-  }
-  // lib.optionalAttrs (cfg.metricIntervalMs != null) {
-    OTEL_METRIC_EXPORT_INTERVAL = toString cfg.metricIntervalMs;
   };
 
   # The exporter's NAME picks the wire protocol, so `protocol` has to be
@@ -131,25 +129,14 @@ in
       '';
     };
 
-    metricIntervalMs = lib.mkOption {
-      type = lib.types.nullOr lib.types.ints.positive;
-      default = null;
-      internal = true;
-      description = ''
-        Metric export interval in milliseconds, set as
-        `OTEL_METRIC_EXPORT_INTERVAL`. Null leaves the SDK default (60s
-        for Claude Code). Host-driven via
-        `services.hyperhive.otel.metricIntervalMs`.
-      '';
-    };
-
     debug = lib.mkOption {
       type = lib.types.bool;
       default = false;
-      internal = true;
       description = ''
-        Emit OTEL SDK diagnostics to stderr (`CLAUDE_CODE_OTEL_DIAG_STDERR=1`).
-        Host-driven via `services.hyperhive.otel.debug`.
+        Emit claude's OTEL SDK diagnostics to stderr
+        (`CLAUDE_CODE_OTEL_DIAG_STDERR=1`). Set it in this agent's own
+        config while troubleshooting its collector connection; it is noisy,
+        so leave it off otherwise. Only takes effect when `enable` is true.
       '';
     };
   };