CURRICULUM.md: full 14-group skill tree drawn from the artistic learning
journey — line control through creative systems, with skill dependency
graph and notes on how exercises translate into module designs.
SPRINT.md: Sprint 2 tickets (AL-010 through AL-015) replacing the Sprint 1
static-stroke prototype with the real scrolling corridor from MODULES.md,
including score model migration, difficulty tiers, and session summary screen.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
