A 45-year-old male presents with chronic irritative dry cough, fatigue, and progressive dyspnea worsening with exertion for over 5 years. Physical examination shows normal temperature, pulse 102/min, respiratory rate 30/min, and mild cyanosis. Chest X-ray reveals bilateral diffuse reticulonodular opacities, predominantly in the middle and lower lung fields with peripheral predominance and indistinct borders, accompanied by small honeycomb-like lucencies. The most likely physical examination finding is: