Enrich Product Catalog for Fulfillment Partner XML Feed

Nexova's nightly fulfillment sync pushes its active product catalog to PartnerLink, a third-party fulfillment provider that accepts a plain XML feed over HTTP. Prices are not stored in the catalog — they live in a configuration variable loaded earlier in the flow. This challenge covers array filtering, per-item enrichment from a flow variable, and producing a valid XML document with element attributes from a JSON source.