feat(Material): Custom Prompts and System Instructions for Angular Material

### Feature Description

In general AI systems produce acceptable quality Angular code to modern standards.

One area where I have found them to have a poor understanding is in their styling of Angular components to align with the latest Material 3 API and theming API. They often do not correctly differentiate between Material 2 and Material 3 styling (eg 'color=primary') and attempt to style component internals when a sutiable override exists

It would be useful to have a standard set of prompts/instructions for Angular Material 2 and 3 similar to those provided for the Core product.

### Use Case

- Helping AI models generate high quality code using Angular Material 2 and 3.

El issue no nombra ningún archivo, prueba ni punto de entrada. Primero localiza los prompts o instrucciones existentes para el producto Core y, después, determina cómo deben separarse las indicaciones para Angular Material 2 y 3; se considera terminado cuando el repositorio contiene instrucciones estándar que abordan sus distintas APIs de styling y theming.

Escrito por el modelo de indexación a partir del texto del issue.