A 32-year-old male patient is undergoing elective open cholecystectomy under general anesthesia with propofol induction and sevoflurane maintenance. Fifteen minutes into surgery, the anesthesiologist notices a sudden rise in end-tidal CO₂ (ETCO₂) from 38 to 52 mmHg, increased jaw rigidity, and a core temperature of 38.5°C. Heart rate is 128/min and blood pressure is 165/95 mmHg. What is the most appropriate immediate next step in management?

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