docs: define saas manager agnet architecture

docs/README.md

@@ -7,6 +7,7 @@
 | 文档 | 用途 |
 |------|------|
 | [`vision-heicode-full-stack-agentic-dev.md`](./vision-heicode-full-stack-agentic-dev.md) | 产品愿景与协作范式（方向性，非排期） |
+| [`saas-manager-agnet-architecture-plan.md`](./saas-manager-agnet-architecture-plan.md) | SaaS Manager / NewAPI / Agnet / Secret Store 的新边界与实施计划 |
 | [`glossary.md`](./glossary.md) | 术语表：Heicode / Manager / 客户端 / 子 agent / SK 等 |
 | [`architecture.md`](./architecture.md) | 架构图与关键数据流（mermaid） |
 | [`sk-lifecycle.md`](./sk-lifecycle.md) | SK（Skill 资产）单点真相：来源、快照、刷新、写权边界 |
@@ -25,11 +26,11 @@
 
 适合实现 Agnet 平台侧、与 Heicode 对接编排或事件流的工程师。
 
-1. [`glossary.md`](./glossary.md) → [`architecture.md`](./architecture.md)
+1. [`saas-manager-agnet-architecture-plan.md`](./saas-manager-agnet-architecture-plan.md) → [`glossary.md`](./glossary.md) → [`architecture.md`](./architecture.md)
 2. [`integration/README.md`](./integration/README.md)：集成方阅读地图
 3. [`sk-lifecycle.md`](./sk-lifecycle.md)：SK 边界（Heicode 端写、Agnet 只读快照）
-4. [`integration/agnet-platform-api-design.md`](./integration/agnet-platform-api-design.md)：详细 API 设计
-5. [`integration/agnet-user-deployment-flow.md`](./integration/agnet-user-deployment-flow.md)：用户绑定 Git / 云权限到部署子 Agnet 的产品流程
+4. [`integration/agnet-platform-api-design.md`](./integration/agnet-platform-api-design.md)：历史 API 草案，若与新架构计划冲突，以新架构计划为准
+5. [`integration/agnet-user-deployment-flow.md`](./integration/agnet-user-deployment-flow.md)：历史用户流程草案，若与新架构计划冲突，以新架构计划为准
 6. [`integration/heicode-oauth-flow.md`](./integration/heicode-oauth-flow.md)：HeiCode 客户端 ↔ Manager 浏览器登录流程
 7. 落地节奏：[`milestones/README.md`](./milestones/README.md)（M3–M5）+ [`milestones/STATUS.md`](./milestones/STATUS.md)