If someone forgot mayim acharonim before Grace After Meals, is he still required to wash after reciting the blessing?

This source-based Torah study examines the question: If someone forgot mayim acharonim before Grace After Meals, is he still required to wash after reciting the blessing? 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.