A 2-day-old male neonate born to a 28-year-old primigravida is noted to have bilateral foot deformities at birth. On examination, both feet are in equinus and varus positions, with the sole facing medially. The feet cannot be passively dorsiflexed beyond neutral. There is no associated cleft palate, cardiac murmur, or other dysmorphic features. What is the most likely diagnosis?