A 62-year-old woman undergoes upper endoscopy for chronic epigastric discomfort. A 3 cm ulcerated lesion is found in the gastric body, and biopsy confirms intestinal-type adenocarcinoma. Staging CT shows no distant metastases and no obvious lymph node involvement (cT2N0M0). Endoscopic ultrasound is planned. The patient is fit for surgery. What is the most appropriate next step in management?