One or two sentences: what the package is and its role in the system.
Why this package exists, what problem it solves, where its responsibility boundary lies.
The key exports (src/index.ts or entry points) that other packages consume.
@languages-learner/<...>— why.
apps/<...>,@languages-learner/<...>— how.
Non-obvious constraints, gotchas, generated files, environment requirements.
- Scripts and how to run: README
- Related architecture: docs/architecture/