Can a Nazirite Who Abstains from Wine Lead Birkat Hamazon over a Cup of Wine?

This source-based Torah study examines the question: Can a Nazirite Who Abstains from Wine Lead Birkat Hamazon over a Cup of Wine? The canonical Hebrew discussion develops the issue through the weekly Torah portion and the sources cited there, preserving the distinctions, tensions, and practical implications of the original text. This localized discovery layer does not add any new halakhic, medical, legal, scientific, historical, theological, or empirical ruling or claim beyond the canonical Hebrew source.