Concept Graph

Triggers & routing

• Trigger: concept graph, prerequisite graph, dependency graph, 概念图, 先修关系.
• Use when: source-tutorial 的 C2，已有 output/TUTORIAL_SPEC.md，需要把教程概念转成可排序的 DAG。
• Skip if: 还没有 tutorial spec。
• Network: none.
• Guardrail: 只做结构，不写 reader-facing prose；图必须保持无环。

Materializes the tutorial spec's structured concept inventory into outline/concept_graph.yml.

Input

• output/TUTORIAL_SPEC.md

Output

• outline/concept_graph.yml

Contract

The graph must contain:

• nodes: {id, title, summary, sourceids, objectiverefs}
• edges: {from, to} meaning prerequisite order

Script boundary

scripts/run.py should:

• load structured spec data
• emit stable node ids and prerequisite edges
• fail if the result would be cyclic or empty

Do not duplicate spec-parsing heuristics in multiple places; keep them in shared tutorial tooling.

Acceptance

• outline/concept_graph.yml exists
• all nodes have stable ids
• the graph is a DAG

Non-goals

• module clustering
• exercise generation
• tutorial prose