Matrix Widget API SDK

The `matrix-widget-api` package provides a JavaScript/TypeScript SDK for both Matrix widgets and the clients that host them, facilitating secure and standardized communication. It allows widgets to request capabilities (like sending messages or accessing state) and clients to drive widget behavior and respond to these requests. Currently at stable version 1.17.0, the library typically sees minor releases on a monthly or bi-monthly cadence, introducing new features, bug fixes, and sometimes breaking changes due to the evolving nature of the Matrix widget specification (which is not yet fully standardized). Its key differentiator is being the official SDK from Matrix.org, ensuring alignment with their reference implementations, though this also means it may be subject to changes as the underlying specification matures.