Didactopus/docs/concept-graph-engine.md

Concept Graph Engine

The concept graph engine provides the backbone for Didactopus.

Features in this revision

• prerequisite reasoning across packs
• cross-pack concept linking
• semantic similarity scoring hook
• curriculum pathfinding
• visualization export

Edge types

The engine distinguishes between:

• prerequisite
• equivalent_to
• related_to
• extends
• depends_on

Only prerequisite edges are used for strict learning-order pathfinding.