fix agent hang after stop: clean up tab ping interval, call harness stop in browser connector

Author: anerli

.changeset/quick-carrots-strive.md

@@ -0,0 +1,5 @@
+---
+"magnitude-core": patch
+---
+
+fix agent hang after stop by cleaning up webharness interval

packages/magnitude-core/src/connectors/browserConnector.ts

@@ -98,6 +98,10 @@ export class BrowserConnector implements AgentConnector {
 
     async onStop(): Promise<void> {
         this.logger.info("Stopping...");
+        if (this.harness) {
+            await this.harness.stop();
+            this.logger.info("WebHarness cleaned up.");
+        }
         if (this.context) {
             await this.context.close();
             this.logger.info("Browser context closed.");

packages/magnitude-core/src/web/harness.ts

@@ -95,6 +95,11 @@ export class WebHarness { // implements StateComponent
         await this.visualizer.setup();
     }
 
+    async stop() {
+        // Clean up tab manager resources
+        this.tabs.destroy();
+    }
+
     get page() {
         return this.tabs.getActivePage();
     }