A 62-year-old woman from Mumbai with a 15-year history of type 2 diabetes mellitus and hyperlipidemia (LDL 180 mg/dL) undergoes carotid ultrasound for stroke risk assessment. The scan reveals multiple atherosclerotic plaques in the carotid bifurcation with intimal-medial thickness (IMT) of 2.2 mm. Histopathological examination of a biopsy specimen shows extensive smooth muscle cell proliferation in the media, accumulation of extracellular lipid within the intima, and a well-organized fibrous cap. Which stage of atherosclerotic plaque development does this pathology represent?