- Add Docker Compose configuration for PostgreSQL 17 with pgvector
- Configure database credentials through a required POSTGRES_PASSWORD environment variable
- Bind the database port to localhost and persist data in a named volume
- Add a database health check using pg_isready
- Add the pg client and TypeScript definitions
- Configure the Node.js test runner with tsx
- Add endpoint tests for health, readiness, and echo request validation
- Cover input length boundaries, invalid message types, unknown routes, and unexpected errors
- Extract the Fastify app factory to support isolated testing without starting the server
- Add centralized error handling and consistent 404 responses
- Guard server startup to prevent listeners from opening when the module is imported
