Your agent API upgrade needs a UI regression test

<p>A successful SDK request is a low bar for an agent upgrade. Your backend can receive a valid response while the person using your app gets an empty result card, a file they cannot open, or a spinner that never ends.</p> <p>The release gate should be a working user task. If you change the model route, tool-response handling, or conversation storage, follow the result all the way into the interfa

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