feat: push OpenClaw metadata to Monitor bridge periodically

- MonitorBridgeClient gains pushOpenClawMeta() method for POST /openclaw
- OpenClawMeta interface defines version/plugin_version/agents payload
- Plugin pushes metadata on gateway_start (delayed 2s) and periodically
- Interval aligns with reportIntervalSec (default 30s)
- Pushes are non-fatal — plugin continues if Monitor is unreachable
- Interval cleanup on gateway_stop
- Updated monitor-server-connector-plan.md with new architecture

plugin/index.ts

@@ -10,7 +10,7 @@
  */
 import { hostname, freemem, totalmem, uptime, loadavg, platform } from 'os';
 import { getLivePluginConfig, type HarborForgeMonitorConfig } from './core/live-config';
-import { MonitorBridgeClient } from './core/monitor-bridge';
+import { MonitorBridgeClient, type OpenClawMeta } from './core/monitor-bridge';
 
 interface PluginAPI {
   logger: {
@@ -93,12 +93,56 @@ export default {
       };
     }
 
+    // Periodic metadata push interval handle
+    let metaPushInterval: ReturnType<typeof setInterval> | null = null;
+
+    /**
+     * Push OpenClaw metadata to the Monitor bridge.
+     * This enriches Monitor heartbeats with OpenClaw version/plugin/agent info.
+     * Failures are non-fatal — Monitor continues to work without this data.
+     */
+    async function pushMetaToMonitor() {
+      const bridgeClient = getBridgeClient();
+      if (!bridgeClient) return;
+
+      const meta: OpenClawMeta = {
+        version: api.version || 'unknown',
+        plugin_version: '0.2.0',
+        agents: [], // TODO: populate from api agent list when available
+      };
+
+      const ok = await bridgeClient.pushOpenClawMeta(meta);
+      if (ok) {
+        logger.debug('pushed OpenClaw metadata to Monitor bridge');
+      } else {
+        logger.debug('Monitor bridge unreachable for metadata push (non-fatal)');
+      }
+    }
+
     api.on('gateway_start', () => {
       logger.info('HarborForge plugin active');
+
+      // Push metadata to Monitor bridge on startup and periodically.
+      // Interval aligns with typical Monitor heartbeat cycle (30s).
+      // If Monitor bridge is unreachable, pushes silently fail.
+      const live = resolveConfig();
+      const intervalSec = live.reportIntervalSec || 30;
+
+      // Initial push (delayed 2s to let Monitor bridge start)
+      setTimeout(() => pushMetaToMonitor(), 2000);
+
+      metaPushInterval = setInterval(
+        () => pushMetaToMonitor(),
+        intervalSec * 1000,
+      );
     });
 
     api.on('gateway_stop', () => {
       logger.info('HarborForge plugin stopping');
+      if (metaPushInterval) {
+        clearInterval(metaPushInterval);
+        metaPushInterval = null;
+      }
     });
 
     // Tool: plugin status