Lab: Building a minimal NF skeleton

Lab Scenario: NF Skeleton From Empty Directory

In this lab you will design a minimal NF skeleton in Go that demonstrates the full lifecycle: startup with TLS configuration loading, NRF registration, exposure of one SBI endpoint plus health and metrics, periodic heartbeat to NRF, graceful SIGTERM handling that drains and deregisters. The goal is not to build a production NF — it is to internalize the lifecycle pattern that every NF follows. A real AMF or SMF is hundreds of times larger but follows exactly this skeleton at its outer edges.