Part 1 of 12 — This series documents a proof-of-concept Notification-Oriented Paradigm (PON) engine in Elixir, a hexagonal boundary around it, and a Smart Brewery digital twin used as a stress lab (simulation, LiveView, telemetry, TimescaleDB, and ML hooks). Here we set the vocabulary and motivation; later posts walk through OTP wiring, the metaprogrammed DSL, the brewery case study, and hard-won performance lessons. https://dev.to/matheuscamarques/notification-oriented-paradigm-pon-in-elixir-why-the-beam-fits-reactive-rules-2p9e