A 68-year-old woman from Mumbai presents with a 10-month history of a dark nodular lesion on her right calf. She reports that the lesion has grown rapidly and recently started bleeding. On examination, the lesion is 12 mm in diameter, deeply pigmented, with a dome-shaped appearance and surface bleeding. Histopathology reveals melanoma with a Breslow thickness of 3.8 mm, ulceration present, and 8 mitoses per mm². Imaging (CT chest/abdomen/pelvis and brain MRI) shows no evidence of distant metastasis. Sentinel lymph node biopsy reveals metastatic melanoma in 2 of 3 sentinel nodes. What is the AJCC TNM stage?