Customer reference metafields now resolve to emails

Customer reference metafields now work just like other reference types - Altera resolves them to something human-readable instead of raw Shopify GIDs.

🚀 What’s New

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• Customer references export as emails – customer reference metafields now show the customer’s email address instead of a GID.
• Import by email – importing a customer reference? Just use the email address and Altera will find the right customer.
• List support – list.customer_reference works too, with comma-separated emails on export.

🔧 Improvements

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• Graceful fallback – if a customer has no email on file, the GID is kept in the export so no data is lost.
• Cross-store friendly – export from one store and import to another using email addresses instead of store-specific IDs.