DW Signup Fulfillment DRY_RUN: OFF (LIVE)

Service is running. It emails new customers the sample-locked code for 3 free samples and handles trade applications.

• GET /healthz — liveness (open)
• POST /webhooks/customers/create — Shopify webhook (HMAC-verified)
• POST /trade/apply — trade application intake
• GET /admin/trade — trade review (basic-auth)