learn-featurelisted

# Learn Feature Use after a feature is completed and accepted. ## Read - completed feature spec and history entry - relevant diff/commits when available - only the implemented files and direct dependencies needed to explain the feature - tests and durable decisions ## Output Format Use the project's learning preference. Default to self-contained HTML/CSS/JS. Use MDX only when the repository already supports it or the human selects it. Place output under: ```text learning/features/[feature-slug]/ ``` ## Lesson Content - what changed and why - architecture and data/control flow - important files and responsibilities - key implementation decisions and tradeoffs - tests and verification - common mistakes and safe extension points - visual diagrams or interactive demonstrations when useful ## Quiz Variety Include a useful mix when appropriate: - multiple choice - true/false with explanation - ordering or matching - predict-the-output/state - debugging scenario - short reflection or implementation challenge Provide immediate feedback and explanations. Keep the lesson scoped and avoid reading the whole repository.