fix(pi): strengthen final release proof

tests/unit/pi-managed-worker-opener.test.ts

@@ -176,6 +176,8 @@ describe('managed Pi worker opener', () => {
       'resources.ready', 'worker.spawn', 'rpc.ready', 'session.open',
       'resources.ready', 'worker.spawn', 'rpc.ready', 'session.open',
     ]);
+    expect(telemetry.slice(0, 4).every(({ cold }) => cold)).toBe(true);
+    expect(telemetry.slice(4).every(({ cold }) => !cold)).toBe(true);
     expect(JSON.stringify(telemetry)).not.toContain(created.id);
     expect(JSON.stringify(telemetry)).not.toContain('PRIVATE MANAGED PROMPT');
     expect(JSON.stringify(telemetry)).not.toContain('provider-secret-value');