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/hive-options-removed.nix

@@ -0,0 +1,62 @@
+# Removal shim for four host options: `c0re.operatorPronouns`,
+# `c0re.contextWindowTokens`, `otel.metricIntervalMs` and `otel.debug`.
+#
+# A definition of any of them is ignored and produces a warning, so a host
+# that still sets one keeps evaluating. The agents' system prompt
+# (hive-agent/prompts/system.md) names the operator's pronouns itself, the
+# harness (hive-agent/src/harness_state.rs) holds the per-model context
+# windows it uses until a turn reports the model's own, every OTEL exporter
+# on the hive runs at its SDK's default cadence, and an agent's own config
+# sets `services.hyperhive.agent.otel.debug`.
+#
+# Self-contained and deletable, like ./swarm-peers-removed.nix: one file to
+# remove when the deprecation window closes.
+{ lib, config, ... }:
+let
+  cfg = config.services.hyperhive;
+
+  # `null` is "not set".
+  ignored =
+    type:
+    lib.mkOption {
+      type = lib.types.nullOr type;
+      default = null;
+      visible = false;
+      internal = true;
+      description = "Removed and ignored.";
+    };
+
+  removed =
+    path: value: why:
+    lib.optional (value != null) ''
+      services.hyperhive.${path} is removed and ignored: ${why} Remove this
+      setting.
+    '';
+in
+{
+  options.services.hyperhive = {
+    c0re.operatorPronouns = ignored lib.types.str;
+    c0re.contextWindowTokens = ignored (lib.types.attrsOf lib.types.int);
+    otel.metricIntervalMs = ignored lib.types.ints.positive;
+    otel.debug = ignored lib.types.bool;
+  };
+
+  config.warnings =
+    removed "c0re.operatorPronouns" cfg.c0re.operatorPronouns ''
+      the operator's pronouns will be a per-operator profile setting. Until
+      then every agent's system prompt says she/her.
+    ''
+    ++ removed "c0re.contextWindowTokens" cfg.c0re.contextWindowTokens ''
+      the agent harness uses the context window the model reports after each
+      turn, and before the first one its own defaults (haiku 200000, sonnet
+      1000000, opus 1000000 tokens).
+    ''
+    ++ removed "otel.metricIntervalMs" cfg.otel.metricIntervalMs ''
+      claude in every agent and hive-c0re's container-resource exporter both
+      export metrics at the SDK default of 60 seconds.
+    ''
+    ++ removed "otel.debug" cfg.otel.debug ''
+      to see one agent's OTEL SDK diagnostics, set
+      services.hyperhive.agent.otel.debug = true in that agent's own config.
+    '';
+}