Learning that survives the chat.

Lessons, feedback, references, and progress stay organized in an inspectable HTML workspace.

Understanding is checked through independent retrieval, application, transfer, and delayed review.

Retries keep the original task and earliest error while revealing only the next useful hint.

The learner owns the `.mastery/` record; no hosted account or remote database is required.

A second cooperating Skill creates code exercises, simulations, visual explanations, and accessible fallbacks.

Packaging, engine behavior, live-agent behavior, usability, and learning outcomes are reported as separate evidence levels.