A 48-year-old man with a history of hypertension (on amlodipine) presents with acute peritonitis secondary to perforated peptic ulcer. He is hemodynamically unstable: BP 95/58 mmHg, HR 118/min, RR 22/min, SpO₂ 94% on room air. He last ate 4 hours ago. The surgical team requests urgent intubation for airway protection before transfer to the operating room. Which of the following is the MOST appropriate sequence of actions during rapid sequence induction in this patient?