Printful sync variants don't include color_code — hex values are only
available from the catalog product endpoint. Fetch catalog colors per
unique product type during sync (cached in process dictionary to avoid
duplicate calls) and store as "colors" array in option values, matching
the Printify format that Product.option_types expects.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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