Multi-route literature expansion + metadata normalization for evidence-first surveys. **Trigger**: evidence collector, literature engineer, 文献扩充, 多路召回, snowballing, cited by, references, 元信息增强, provenance. **Use when**: Workflow 需要按锁定的 retrieval policy 扩充候选文献并补齐可追溯 metadata。
Multi-route literature expansion + metadata normalization for evidence-first surveys. **Trigger**: evidence collector, literature engineer, 文献扩充, 多路召回, snowballing, cited by, references, 元信息增强, provenance. **Use when**: Workflow 需要按锁定的 retrieval policy 扩充候选文献并补齐可追溯 metadata。