learn-something-reader

Use when writing tests for CourseReader code. Nature-based: unit, page snapshot, component, hook, store. Trigger on "write tests", "add tests", "test this", or when creating new files that need test coverage.

Codified patterns from CourseReader refactor. Component decomposition, prop elimination, store optimization, React 19 idioms. Trigger when user says "refactor", "clean up", "extract component", "optimize store", "remove prop drilling", or "apply refactor patterns".

Prevents scroll regression when editing PageContent or LessonSection. Trigger on any edit to PageContent.tsx, LessonSection.tsx, or PageLayout.tsx.