backend-demo-v1

Create or update local characterization and integration tests for Node.js or TypeScript backends that must preserve behavior across refactors, framework migrations, or legacy cleanup using record/replay at HTTP boundaries and Testcontainers-backed verification of real PaaS side effects. Use this whenever the user wants to freeze current backend behavior, add golden master or VCR-style tests, compare Express/Hono/Fastify/Azure Function implementations, validate refactors locally, or keep cloud-heavy integrations testable while still proving real writes to storage, Cosmos DB, Redis, Service Bus, or similar services.