Scaffold exercises

Build an exercise directory tree that passes the course's exercise linter, then commit it. Throughout, run the linter with the project's own command (for example pnpm lint:exercises or whatever the repo defines) — substitute it wherever this skill says "run the linter".

Directory naming

• Sections: XX-section-name/ under exercises/ (e.g. 01-retrieval-skill-building)
• Exercises: XX.YY-exercise-name/ under a section (e.g. 01.03-retrieval-with-bm25)
• Section number is XX; exercise number is XX.YY
• Every name is dash-case: lowercase words joined by hyphens

Exercise variants

Each exercise carries at least one of these subfolders:

• problem/ — the student's starting point, with TODOs
• solution/ — the reference answer
• explainer/ — conceptual material, no TODOs