Align organization card with community onboarding

Add the GitHub project, Discord community, Google onboarding form, team guidance, and contribution links.

README.md

@@ -9,9 +9,11 @@ pinned: false
 
 # MatrAIx
 
-**Persona-driven simulation for evaluating AI agents in the real world.**
+> **Simulate before reality.**
 
-MatrAIx builds diverse, high-dimensional persona populations that interact with AI systems across surveys, chat, websites, and operating-system applications. Our goal is to help teams evaluate how agents behave for different people, uncover long-tail failures before deployment, and produce reproducible evidence for product improvement and model training.
+MatrAIx is an open-source platform for large-scale, persona-driven agent simulation. We test products, conversations, and workflows across surveys, chat, live web, and desktop applications before they reach real users.
+
+Our north star is **8.3B persona-scale simulation**—one synthetic profile per person on Earth—while treating simulation as a tool for exploration, not a replacement for real people.
 
 ## What we build
 
@@ -30,9 +32,20 @@ MatrAIx builds diverse, high-dimensional persona populations that interact with
 
 ## Explore MatrAIx
 
+- GitHub: [MatrAIx-ai/MatrAIx](https://github.com/MatrAIx-ai/MatrAIx)
 - Website: [matraix.ai](https://matraix.ai)
-- Interactive persona survey: [matraix.ai/play.html](https://matraix.ai/play.html)
-- Demo application catalog: [Demo Application Data](https://huggingface.co/datasets/MatrAIx2026/Demo_Application_Data)
+- Discord: [Join the MatrAIx community](https://discord.gg/vruP88PTZ)
+- Google Form: [Apply to join MatrAIx](https://forms.gle/hwEHng5HGWRqcJue9)
 - Contact: [info@matraix.ai](mailto:info@matraix.ai)
 
-We are building evaluation infrastructure for AI agents that must work for the full diversity of real users—not only the average case.
+## Join the project
+
+[![Discord](https://img.shields.io/badge/Discord-join%20MatrAIx-5865F2?style=for-the-badge&logo=discord&logoColor=white)](https://discord.gg/vruP88PTZ)
+[![Google Form](https://img.shields.io/badge/Google%20Form-join%20MatrAIx-4285F4?style=for-the-badge&logo=googleforms&logoColor=white)](https://forms.gle/hwEHng5HGWRqcJue9)
+
+1. [Join Discord](https://discord.gg/vruP88PTZ) and set your nickname to **`Full Name - Affiliation`**.
+2. Complete the [MatrAIx onboarding form](https://forms.gle/hwEHng5HGWRqcJue9) with your background and team interests.
+3. Choose a team—**Persona**, **Application**, or **Environment**—from the [GitHub onboarding guide](https://github.com/MatrAIx-ai/MatrAIx#teams).
+4. Read [CONTRIBUTING.md](https://github.com/MatrAIx-ai/MatrAIx/blob/main/CONTRIBUTING.md) before opening a pull request.
+
+Help us build evaluation infrastructure for AI agents that must work for the full diversity of real users—not only the average case.