# Chat Server (cp_031)

## Objective
Build a websocket chat server with rooms, presence, typing indicators, and message history.

## Language & Library Constraints
- Primary language: node
- Available libraries: express, zod, prisma, bullmq
- Use library APIs explicitly where suitable in execution contracts.

## Acceptance
- Deterministic taskitems with strict execution contracts.
- Include selected library and preferred APIs when applicable.