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.

hive-c0re/src/meta.rs

@@ -555,10 +555,6 @@ struct OtelConfig {
     endpoint: String,
     protocol: String,
     extra_resource_attributes: Option<String>,
-    metric_interval_ms: Option<u64>,
-    /// `HYPERHIVE_OTEL_DEBUG=1` → `services.hyperhive.agent.otel.debug = true` →
-    /// `CLAUDE_CODE_OTEL_DIAG_STDERR=1` in every agent's env.
-    debug: bool,
 }
 
 /// Read the hive-wide OTEL config from env, or `None` when OTEL is off.
@@ -578,19 +574,10 @@ fn otel_config() -> Option<OtelConfig> {
     let extra_resource_attributes = std::env::var("HYPERHIVE_OTEL_EXTRA_RESOURCE_ATTRIBUTES")
         .ok()
         .filter(|v| !v.is_empty());
-    let metric_interval_ms = std::env::var("HYPERHIVE_OTEL_METRIC_INTERVAL_MS")
-        .ok()
-        .and_then(|v| v.parse::<u64>().ok())
-        .filter(|v| *v > 0);
-    let debug = std::env::var("HYPERHIVE_OTEL_DEBUG")
-        .ok()
-        .is_some_and(|v| v == "1");
     Some(OtelConfig {
         endpoint,
         protocol,
         extra_resource_attributes,
-        metric_interval_ms,
-        debug,
     })
 }
 
@@ -902,17 +889,6 @@ where
                 esc(attrs)
             );
         }
-        if let Some(ms) = otel.metric_interval_ms {
-            // Int option — emit a bare numeric literal (no quotes). `ms` is a
-            // parsed u64, so it can't inject anything into the rendered nix.
-            let _ = writeln!(
-                out,
-                "              services.hyperhive.agent.otel.metricIntervalMs = {ms};"
-            );
-        }
-        if otel.debug {
-            out.push_str("              services.hyperhive.agent.otel.debug = true;\n");
-        }
     }
     // Agent-facing service URLs (`services.hyperhive.agent.forge.url`, `services.hyperhive.agent.matrix.url`):
     // emit the host's real values as build-time agent config, the same