Taxonomy Builder (router, compatibility mode)

Triggers & routing

• Trigger: taxonomy, taxonomy builder, 分类, 主题树, taxonomy.yml.
• Use when: survey/snapshot 的结构阶段（NO PROSE），已有 papers/core_set.csv，需要生成可映射且读者友好的主题结构。
• Skip if: 已经有批准过且可映射的 taxonomy（不要无意义重构）。
• Network: none.
• Guardrail: 避免泛化占位桶；保持 2+ 层且每节点有具体描述。

Build outline/taxonomy.yml from papers/core_set.csv.

P0 compatibility note:

• The output contract stays the same (outline/taxonomy.yml, YAML list, >=2 levels, concrete descriptions).
• Curated domain taxonomies now live in assets/domain_packs/*.yaml instead of Python prose.
• scripts/run.py stays a deterministic scaffold/helper: detect domain pack -> load pack when available -> otherwise fall back to the generic builder.

Load Order