Is extending the Friday-night Shabbat meal an enhancement of the mitzvah or an obligation?

This source-based Torah study examines: Is extending the Friday-night Shabbat meal an enhancement of the mitzvah or an obligation? It follows the canonical Hebrew discussion and the classical sources cited there, preserving the distinctions and review status of the original. This localized layer is for study and discovery only; it is not practical halakhic, medical, legal, scientific, safety or pastoral advice.