Add AGENTS.md with Cursor Cloud development environment setup

[theSaaSsin]

Summary

Adds AGENTS.md with development environment instructions for Cursor Cloud agents working on this codebase.

What's included

• AGENTS.md: Documents that this is a zero-dependency Node.js app, how to start the server (node server.js on port 4000), the required data/ directory setup, and key facts about the codebase (no npm install needed, no build step, vanilla frontend, etc.).

Environment verification

The dev environment was fully verified end-to-end:

• Node.js server starts and serves both the API and frontend on port 4000
• All REST API endpoints work (clients, leads, outreach — GET/POST/PATCH)
• Client creation, system generation (landing pages, outreach sequences, CRM structures), lead management, and outreach queue all function correctly
• The update script creates the data/ directory and seeds JSON files idempotently

Demo

thesaassin_demo_end_to_end.mp4

Full end-to-end demo showing: client creation, landing page generation, CRM lead management, and outreach queue.

Initial operator panel
Generated landing page preview
CRM leads view
Outreach queue

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