Original and Enhanced Record Instances — the Record-Instance Model

augment-it does not mutate an uploaded record set, and it does not spawn a new derived set per prompt run. It keeps an immutable original import and a single mutable enhanced instance that accumulates every enrichment in a round. The user can promote an enhanced instance to be the source of the next round, so the model is generational — original → enhanced → promote → enhanced' — with an id-map that holds across every generation so the eventual write-back into the system of record always knows its target. Two classes of enhancement — lookup and judgment — flow through this model very differently.