# knowledge-prune 世界級對照(knowledge-prune SKILL.md「世界級對照」extract)

本 skill 是本 DS 原創的自我 prune 機制,但對齊:

- **Elasticsearch Index Lifecycle Management**:hot / warm / cold 階段自動降級 + delete old data — 類 retire rate
- **Linux kernel doc policy**:Sphinx deprecation warnings + removal schedule — 類 transition period 過渡期
- **Python PEP 387 Backwards Compatibility Policy**:明定哪些改動需 deprecation 期,哪些可立刻刪 — 類 P0 vs P2 triage
