course-revise
Aplica cambio incremental a un curso existente: clasifica MAJOR/MINOR/PATCH, valida ID stability, bumpea version, append version_timeline, escribe CHANGELOG entry. Si MAJOR: impact analysis con grandfather clause option. Use when user asks to "revise course", "update course", "bump version", "edit syllabus", "actualizar curso", "iterar curso", "/course-revise".