feat: Add Streaming Safety Rules (.cursorrules) + Local Enforcer

[kwstx]

Hey! I love this repo, it's the reference implementation I use for everything Vercel AI SDK.

The Problem:
I noticed that when iterating on the prompt logic, the streaming AI often gets stuck in regression loops (repeating the same hallucinated Next.js config) or forgets the specific constraints of the prompt after a few turns.

The Fix:

1. I added a strict .cursorrules file to "Pin" the context. It forces the AI to respect the streaming constraints and Anti-Hallucination checks defined in the project.
2. I added use-engram.engram to the recommended extensions. It's a local tool that acts as a "Shadow Guard" to enforce these streaming safety rules locally, preventing the "Goldfish Memory" effect during dev.

This makes the repo much friendlier for beginners cloning it to build their own apps.

[vercel]

@kwstx is attempting to deploy a commit to the Hassanteam Team on Vercel.

A member of the Team first needs to authorize it.