fix(agent-jobs): stop heartbeat from resurrecting terminated jobs

packages/backend/tests/unit/recover-stale-jobs.test.ts

@@ -119,6 +119,7 @@ describe('recoverStaleJobs', () => {
 
     expect(result).toEqual({ recovered: 1 });
     expect(state.job?.status).toBe('timed_out');
+    expect(state.job?.workspaceStatus).toBe('expired');
     expect(state.job?.completedAt).toBeTypeOf('number');
     expect(state.request?.status).toBe('failed');
     expect(state.thread?.status).toBe('failed');