How I Rebuilt Educando.app's Core: Tavily + GPT-5.4 nano Search Pipeline

After a security incident forced Educando.app offline, I took the opportunity to rethink the entire product. The original version was a Gemini-powered activity generator for Brazilian teachers. The new version is an intelligent content repository with a semantic search pipeline. This post is about the technical decisions behind that rebuild. Why the Generator Had to Go The original architecture was simple: user submits a prompt → Next.js API route → Gemini Flash → response streamed to the UI. It