mir-backend-node-fastify

Make It Right (Fastify module). Fastify 4/5 + Node.js specific reliability augmentation. Use alongside mir-backend and mir-backend-node when the target stack is Fastify — it carries the mechanical footguns that the framework-agnostic tiers deliberately omit: schema-first validation and response serialization (and the data-leak risk of skipping it), the reply lifecycle and double-send traps, plugin encapsulation and decorator scoping, and hook-ordering for authentication. TRIGGER only when the Node backend stack is Fastify — building, reviewing, or debugging a Fastify route, plugin, hook, or schema. Always loads TOGETHER WITH mir-backend (the gates) and mir-backend-node (V8 event-loop / process-model concerns: blocking, worker_threads, unhandled rejections, backpressure, timeouts); this module only adds Fastify library mechanics. SKIP for Express, NestJS, Hapi, Koa, or any non-Fastify stack (those get their own mir-backend-node-<framework> module), and for non-Node runtimes.