A 28-year-old male software engineer from Bangalore presents with a 6-month history of asymptomatic, hypopigmented patches on his trunk and upper back. The lesions are non-pruritic but cosmetically concerning. On examination, he has well-demarcated, fawn-coloured macules with fine scale on the chest and shoulders. KOH mount of scale shows short hyphae and yeast cells described as 'spaghetti and meatballs' appearance. Wood's lamp examination reveals yellow-green or coppery-orange fluorescence. What is the most likely causative organism?