A 48-year-old woman from Mumbai undergoes core needle biopsy for a 3 cm left breast mass. Histopathology confirms invasive ductal carcinoma (IDC), grade 2, with ER/PR positive (80% and 60% respectively) and HER2 negative. Staging CT shows no distant metastases. Physical examination reveals no palpable axillary nodes. What is the most appropriate next step in management?

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