Messaging lanes and Resend updates subdomain

Summary

  • Documented product vs human email lanes: Resend (app) on updates.foodtrucknerdz.com, Customer.io + Twilio (journeys), ZeptoMail (human send-as when needed).

  • Default FTN_TRANSACTIONAL_FROM hint updated to support@updates.foodtrucknerdz.com.

  • Cross-linked Dev-Centr Business Bootstrap matrix and FoodTruckNerdz infra for DNS roles (updates / send / links).