Match one or more TCGCSV exports against a Shopify product export to generate price, new product, and image enrichment CSVs. Quantities are never touched.
Map each TCGCSV group name to the Shopify set code. Only mapped sets will be processed — others will warn.
Auto-detects which set a promo belongs to from its card number total.
Rune promos use a letter suffix (e.g. R01b, R01c). Map suffix letter to set code.