Expose the business-data intake chain directly from the docs overview

Constraint: Keep this checkpoint limited to navigation docs and preserve the condensed doc structure
Rejected: Keep the new business-export material discoverable only through deep links | New sessions should find the intake chain from the overview immediately
Confidence: high
Scope-risk: narrow
Directive: Maintain README as the compressed navigation surface and avoid expanding it into another full spec
Tested: Rechecked 211 relative links across the updated overview, changelog, and handoff docs
Not-tested: No code or training path executed in this navigation-only checkpoint

+## 2026-06-02 总览页补齐业务导出链入口 checkpoint
+
+完成项：
+- 已更新 `docs/README.md`，把业务数据接入链提升为独立导航分组。
+- 已在总览页直接给出业务导出最短链与离线 smoke 入口。
+
+结论：
+- 新 session 不需要再从大量文档中手动拼出业务接入顺序。
+- 文档总览已能同时覆盖开放数据链与业务数据链。
+
 ## 2026-06-02 业务导出离线 smoke 实跑通过 checkpoint
 
 完成项：

@@ -8,8 +8,9 @@
 
 1. **项目与架构**
 2. **数据与评测**
-3. **服务与工程**
-4. **研究与路线**
+3. **业务数据接入**
+4. **服务与工程**
+5. **研究与路线**
 
 建议先只读这 4 组，不必一次看完全部细节文档。
 
@@ -22,19 +23,20 @@ flowchart TD
     A[Docs Entry] --> B[Project Responsibility]
     A --> C[Architecture]
     A --> D[Dataset Spec]
-    A --> E[Service API]
-    A --> F[Industrial Benchmark]
-    A --> G[Industrialization Roadmap]
-    A --> H[Licensing & Sources]
-    A --> I[SOTA Research]
+    A --> E[Business Export Chain]
+    A --> F[Service API]
+    A --> G[Industrial Benchmark]
+    A --> H[Industrialization Roadmap]
+    A --> I[Licensing & Sources]
+    A --> J[SOTA Research]
 
     B --> C
     C --> D
-    C --> E
-    D --> F
-    F --> G
-    H --> G
-    I --> G
+    D --> E
+    E --> F
+    G --> H
+    I --> H
+    J --> H
 ```
 
 ---
@@ -46,8 +48,8 @@ flowchart TD
 | 新成员 | [项目与架构](./project-responsibility-map.md), [系统架构](./acr-architecture.md) |
 | 算法/模型 | [数据规范](./dataset-spec.md), [SOTA 调研](./sota-research-2026.md) |
 | 平台/后端 | [服务接口](./service-api.md), [评测规范](./industrial-benchmark-spec.md) |
-| 数据接入 | [数据来源与接入](./dataset-sources-and-licensing.md) |
-| 负责人/规划 | [工业化路线](./industrialization-roadmap.md) |
+| 数据接入 | [开放数据工作流](./open-dataset-workflow.md), [业务导出 Cookbook](./business-export-cookbook.md) |
+| 负责人/规划 | [工业化路线](./industrialization-roadmap.md), [交接文档](./session-handoff.md) |
 
 ---
 
@@ -67,15 +69,29 @@ flowchart TD
 快速落地入口：
 - [开放数据工作流](./open-dataset-workflow.md)
 - [本地开放数据落点目录](../acr-engine/data/raw/README.md)
-
-### C. 服务与工程
+- 离线 smoke 已验证：`acr-engine/scripts/business_export_offline_smoke.py`
+
+### C. 业务数据接入
+- [业务素材类型与 Bucket 指南](./business-music-bucket-and-type-guide.md)
+- [业务 Manifest 与 Type-Role 规范](./business-manifest-and-type-role-spec.md)
+- [业务导出 Cookbook](./business-export-cookbook.md)
+- [业务数据到项目 Manifest 适配](./business-project-manifest-adapter.md)
+
+业务数据最短链：
+1. [业务导出 Cookbook](./business-export-cookbook.md)
+2. `acr-engine/scripts/normalize_business_export.py`
+3. `acr-engine/scripts/split_business_manifest_ready.py`
+4. `acr-engine/scripts/build_business_project_manifests.py`
+5. `acr-engine/scripts/business_export_offline_smoke.py`
+
+### D. 服务与工程
 - [服务接口](./service-api.md)
 - [持续开发交接文档](./session-handoff.md)
 - [当前能力地图](./current-capability-map.md)
 - [首次启动检查清单](../acr-engine/FIRST_RUN_CHECKLIST.md)
 - [更新记录](./CHANGELOG.md)
 
-### D. 研究与路线
+### E. 研究与路线
 - [工业化路线](./industrialization-roadmap.md)
 - [SOTA 调研](./sota-research-2026.md)
 - [引用来源总表](./references-and-sources.md)

@@ -253,6 +253,9 @@
   - `high_energy`：`mean_top1=0.9167, min=0.9167, max=0.9167, stdev=0.0`
   - `hybrid`：`mean_top1=0.8750, min=0.7917, max=0.9583, stdev=0.0680`
 
+### 文档入口最新状态
+- `docs/README.md` 已补齐业务数据接入导航与最短链说明。
+
 ### 最优先待办
 1. 把已完成的 toy bucket baseline 升级为语义 bucket（风格 / 结构 / hard-case）。
    - 模板：`acr-engine/configs/buckets/fma_semantic_bucket_template.json`