Workflow pack for Shopify order customer replies. It composes the Shopify capability pack with Email / Outbox and the existing outbound response loop: read one order and its customer context, draft a grounded plain-text response, send only when send_reply is explicitly enabled so the mail-send approval boundary handles the customer-facing write, then watch the customer reply and surface actionable responses for owner follow-up or conversion. Shopify remains read-only in this workflow; it does not edit orders, fulfillments, products, prices, inventory, refunds, cancellations, notes, tags, arbitrary GraphQL, storefront buyer APIs, Shopify Inbox, Shop product reviews, or Shopify Flow automations.