# L3 — 解释层 SLM/XAI

## 设计

* **ExplanationRegistry**：存 (decisionId, explanationHash, modelVersion, timestamp)
* **baby-explanation Rust crate**：当前为 deterministic stub explainer（PoC）；主网前 swap 真 SLM 微调 + XAI feature attribution

## 链上事实

* ExplanationRegistry 已部署 chain 391
* baby-explanation crate 集成 PoBRegistry / PoDRegistry

## 主网前必备

1. 真 SLM 微调（4-8 周 roadmap）
2. XAI 算法选型 (LIME / SHAP / IG)
3. SLM 推理 D2 TEE attestation 集成

详见：[L3 W1-W4 devlog](https://github.com/leeleeEcho/babyDriver_Layer2/blob/main/docs/devlog/2026-Q2/README.md) (4 周开发历程)。


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