A 72-year-old woman from Mumbai undergoes colonoscopy for iron-deficiency anaemia and is found to have a 4 cm mass in the caecum with biopsy-proven adenocarcinoma. CT staging shows T2N0M0 disease with no distant metastases. She has a history of hypertension and mild chronic kidney disease (eGFR 55 mL/min). She is otherwise fit and willing for surgery. What is the most appropriate next step in management?