angular/components — reverse-engineered prompt

I want you to build the Angular components project, basically the official set of reusable Angular UI pieces and helper tools that people can drop into their apps. It should include polished Material Design components, lower level building blocks for making custom components, accessible ARIA based behaviors, and the Angular wrappers for Google Maps and YouTube.

Please make it feel production ready, with clean docs and demos, sensible APIs, strong accessibility, good test coverage, and solid behavior across modern browsers and screen readers. The goal is a library that developers can use right away, but also learn from if they want to build their own components.

If there are guides, examples, or demo pages already expected in this repo, wire those up too so someone new can quickly understand how to use the components. Keep everything aligned with current Angular best practices, and look up the latest docs online if you need to fill in gaps.