fix: use runtime API for version and agent list instead of subprocess

Use api.runtime.version for openclaw version and
api.runtime.config.loadConfig() for agent list. Eliminates the
periodic openclaw agents list subprocess that caused high CPU usage.

plugin/index.ts

@@ -14,7 +14,7 @@
 import { hostname, freemem, totalmem, uptime, loadavg, platform } from 'os';
 import { getPluginConfig } from './core/config';
 import { MonitorBridgeClient, type OpenClawMeta } from './core/monitor-bridge';
-import { listOpenClawAgents } from './core/openclaw-agents';
+import type { OpenClawAgentInfo } from './core/openclaw-agents';
 import { registerGatewayStartHook } from './hooks/gateway-start';
 import { registerGatewayStopHook } from './hooks/gateway-stop';
 import {
@@ -32,6 +32,12 @@ interface PluginAPI {
     warn: (...args: any[]) => void;
   };
   version?: string;
+  runtime?: {
+    version?: string;
+    config?: {
+      loadConfig?: () => any;
+    };
+  };
   config?: Record<string, unknown>;
   pluginConfig?: Record<string, unknown>;
   on: (event: string, handler: () => void) => void;
@@ -96,7 +102,7 @@ export default {
           avg15: load[2],
         },
         openclaw: {
-          version: process.env.OPENCLAW_SERVICE_VERSION || api.version || 'unknown',
+          version: api.runtime?.version || api.version || 'unknown',
           pluginVersion: '0.3.1', // Bumped for PLG-CAL-004
         },
         timestamp: new Date().toISOString(),
@@ -118,10 +124,21 @@ export default {
       const bridgeClient = getBridgeClient();
       if (!bridgeClient) return;
 
+      let agentNames: string[] = [];
+      try {
+        const cfg = api.runtime?.config?.loadConfig?.();
+        const agentsList = cfg?.agents?.list;
+        if (Array.isArray(agentsList)) {
+          agentNames = agentsList
+            .map((a: any) => typeof a === 'string' ? a : a?.name)
+            .filter(Boolean);
+        }
+      } catch { /* non-fatal */ }
+
       const meta: OpenClawMeta = {
-        version: process.env.OPENCLAW_SERVICE_VERSION || api.version || 'unknown',
+        version: api.runtime?.version || api.version || 'unknown',
         plugin_version: '0.3.1',
-        agents: await listOpenClawAgents(logger),
+        agents: agentNames.map(name => ({ name })),
       };
 
       const ok = await bridgeClient.pushOpenClawMeta(meta);