A retail company's Copilot Studio customer service agent has been live for three months. The product team maintains a tuning backlog fed by user thumbs-down feedback, automated groundedness scores, and support escalations. This sprint they can address only a limited set of items. The backlog contains: (1) an intent misrouting affecting 8% of all sessions that leads users to a wrong-but-harmless topic, (2) a rarely triggered path (0.2% of sessions) where the agent provides incorrect refund eligibility guidance that has already caused two compliance complaints, (3) a cosmetic formatting issue in a summary shown in 40% of sessions, and (4) occasional latency spikes on a low-traffic reporting query. How should the architect prioritize the backlog for this sprint?