fix(agent-browser): restore bounded presentation lifecycle

electron/coding-runtime/pi/extension-host.ts

@@ -18,6 +18,7 @@ import type { CodingPluginToolDefinition } from '../../../shared/coding-plugins'
 import type { PiSkillEntry } from './resource-loader';
 import type { EffectivePluginSnapshot } from '../../coding-plugins/effective-resolver';
 import { DevicePackageError } from '../../coding-packages/device-package-manager';
+import { AgentBrowserFault } from '../../agent-browser/fault';
 
 const MAX_REQUEST_BYTES = 64 * 1024;
 const PRODUCT_TOOL_NAME_PATTERN = /^[A-Za-z][A-Za-z0-9._:-]{0,63}$/u;
@@ -516,6 +517,17 @@ export class PiManagedExtensionHost {
         record.waiters.delete(value.resourceId);
       }
     } catch (error) {
+      if (!response.writableEnded && error instanceof AgentBrowserFault) {
+        const message = error.message.slice(0, 512);
+        this.respond(response, 400, {
+          code: error.code,
+          error: `${error.code}: ${message}`,
+          retryable: error.retryable,
+          ...(error.generation === undefined ? {} : { generation: error.generation }),
+          ...(error.outcome === undefined ? {} : { outcome: error.outcome }),
+        });
+        return;
+      }
       if (!response.writableEnded && error instanceof DevicePackageError) {
         this.respond(response, 400, {
           code: error.code,