docs: add archive and migration notice

MIGRATED_TO.md

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+# MIGRATED_TO
+
+source_repo: joy7758/langchain-pop
+
+本仓库已停止作为当前主线维护入口。
+
+## 迁移去向
+
+- 主线：Agent Evidence / Operation Accountability Profile（智能体执行证据与操作问责配置文件）
+- 主线入口：
+  - https://github.com/joy7758/agent-evidence
+  - https://github.com/joy7758/fdo-kernel-mvk
+  - https://github.com/joy7758/verifiable-agent-demo
+  - https://github.com/joy7758/digital-biosphere-architecture
+  - https://github.com/joy7758/token-governor
+  - https://github.com/joy7758/aro-audit
+- 整理索引：https://github.com/joy7758/digital-biosphere-architecture/tree/main/%E5%9B%9E%E6%94%B6%E7%AB%99
+
+## 迁移原因
+
+为了减少仓库入口分散，当前维护重心迁移到“智能体执行证据与操作问责配置文件”主线。该主线关注智能体执行之后留下可验证、可复核、可审计的证据，而不是只让 AI（Artificial Intelligence，人工智能）多回答一句。
+
+## 当前状态
+
+- status: migrated
+- archive_status: not-archived-by-this-change
+- deletion_status: not-deleted
+
+本文件不得被解释为仓库已经删除，也不得作为删除许可。后续是否 archive（归档）或保留为历史记录，需要单独人工复核。

README.md

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+> **Maintenance notice**
+>
+> This repository is no longer the primary maintenance entry for the Agent Evidence / Operation Accountability Profile（智能体执行证据与操作问责配置文件）mainline. It is retained for migration review or historical reference. This change does not delete or archive the repository. See `MIGRATED_TO.md` for the current migration target and review status.
+
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 [English](./README.md) | [中文](./README.zh-CN.md)
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