EXISTING INSTALLATION: do not delete your database or reinstall.
Read docs/REFERENCE-DESIGN-AND-DEMO.md for the five simple update steps.
Merge app/ and public/ into your existing matching folders, then Admin > More tools > Sample Data > Load reference samples.
Demo sales are labelled illustrations; sample products and stock are editable catalog records.
This is a reference-design/sample-data update, not certification of all 142 requirements.
