Month 5-Production Architecture: Hexagonal, Zero-Copy I/O, Observability, Testing¶

Goal: by the end of week 20 you can (a) lay out a non-trivial service following hexagonal/ports-and-adapters and justify each boundary, (b) move bytes from a socket through a parser into application state without copying, (c) instrument a service end-to-end with tracing and OpenTelemetry, and (d) ship a test suite combining unit, integration, property-based, and fuzz harnesses.