felangel/bloc ? reverse-engineered prompt

Build me a Dart package collection for state management in Flutter and Angular that follows the BLoC pattern.

I want the main library to help separate UI from app logic, make state changes predictable, and be easy to test and reuse. Include the core bloc package, Flutter support, Angular support, testing helpers, linting, concurrency helpers, hydrated state persistence, and a way to replay state changes. It should come with clear documentation, migration guidance, and a few simple example apps like a counter, a login flow, an infinite list, a search screen, and a weather screen.

Please make it feel polished and production ready, with good defaults, strong tests, and an easy path for people to learn from the examples. If you need to look up current docs online while building it, go ahead.