Create an uppercase three-character order prefix column while retaining the original CSV fields and direct source lineage. Results remain inspectable, reusable, and downloadable.

Extracts the first three characters from each order number in an uploaded CSV and writes them to a new uppercase `prefix` column. The structured `Order Prefixes` Transform retains the original `order` and `amount` columns, preserves direct lineage to the source CSV, and produces inspectable, reusable, downloadable data. Repeated runs reuse the existing Transform; changes update it in place; reset removes generated results while preserving source and Model assets.