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.

No file, test, or entry point is named in the issue. First locate the existing prompts or instructions for the Core product, then determine how Angular Material 2 and 3 guidance should be separated; done means the repository contains standard instructions that address their distinct styling and theming APIs.

Written by the indexing model from the issue text.