citation-anchoring

Regression-check citation anchoring (citations stay in the same subsection) to prevent “polish drift” that breaks claim→evidence alignment. **Trigger**: citation anchoring, citation drift, regression, cite stability, 引用锚定, 引用漂移. **Use when**: after editing/polishing, you want to confirm citations did not migrate across `###` subsections. **Skip if**: you do not have a baseline anchor file yet. **Network**: none. **Guardrail**: analysis-only; do not edit content.