A 58-year-old Indian man presents with a 2 cm dark brown nodule on his left shoulder with irregular borders and color variegation (brown, black, and tan). On dermoscopy, asymmetry, irregular dots and globules, and irregular streaks are noted. Excision biopsy reveals a melanoma with Breslow thickness of 2.8 mm, 3 mitotic figures per mm², and no ulceration. Sentinel lymph node biopsy is negative. What is the AJCC TNM stage of this melanoma?