Case
Smart recipe book
For making ice cream on the floor, not for storing recipes in someone else's cloud. Open the book, read a card, or ask the chatbot about the flavors you already have.
What it is
Each flavor lives in a file on the machine. Weights, mix steps, and notes sit on a card you can edit by hand. The chatbot sits next to that book. It can look up who uses an ingredient, compare open cards, give a prep order, or change a mix in the app.
Answers come from the open book, not from invented formulas. If the book does not say, it should say so.
The boundary
The file is still the record. Chat can update what you see on screen. It does not write the disk. Save does. Recipes do not have to live in someone else's product. Same idea as the rest of the work: the book stays where the work is.