Add explicit drop zones for real open-music corpora

Constraint: Replacing the synthetic stand-in with real FMA or MTG-Jamendo data should not require users to infer directory structure
Rejected: Leave only generic workflow text | Still forces users to guess where local audio should live before smoke runs
Confidence: high
Scope-risk: narrow
Directive: Keep future real-corpus onboarding anchored to data/raw drop zones and smoke-local commands
Tested: filesystem existence checks for acr-engine/data/raw/fma_small_audio, acr-engine/data/raw/mtg_jamendo_audio, acr-engine/data/raw/README.md, docs/README.md, docs/open-dataset-workflow.md, acr-engine/data/external_ingested/README.md
Not-tested: Real downloaded audio placed into the new drop zones

@@ -13,6 +13,9 @@ Examples:
 - [data/raw/fma_small_audio/](../raw/fma_small_audio/)
 - [data/raw/mtg_jamendo_audio/](../raw/mtg_jamendo_audio/)
 
+Drop-zone details:
+- [data/raw/README.md](../raw/README.md)
+
 ### 2. Generate manifests through the adapter entrypoint
 Optional pre-check:
 ```bash

+# Local Open-Music Drop Zones
+
+Put real downloaded open-music audio files here before running the one-shot smoke flow.
+
+## Recommended folders
+- `data/raw/fma_small_audio/`
+- `data/raw/mtg_jamendo_audio/`
+
+## Next command
+For FMA:
+```bash
+/usr/local/miniconda3/bin/python src/data/external_adapters.py smoke-local fma data/raw/fma_small_audio --output-root data/external_smoke --eval-ratio 0.2 --query-duration 8.0 --train-epochs 1 --batch-size 2
+```
+
+For MTG-Jamendo:
+```bash
+/usr/local/miniconda3/bin/python src/data/external_adapters.py smoke-local mtg_jamendo data/raw/mtg_jamendo_audio --output-root data/external_smoke --eval-ratio 0.2 --query-duration 8.0 --train-epochs 1 --batch-size 2
+```

@@ -144,6 +144,26 @@
 - 现在只要替换 `input_dir`，就能对真实 FMA / MTG-Jamendo 本地目录跑完整 smoke
 - 这显著降低了真实开放数据集接入和验证成本
 
+### Stage: 真实开放数据落点目录模板
+
+完成项：
+- 新增 [acr-engine/data/raw/README.md](../acr-engine/data/raw/README.md)
+- 新建本地开放数据落点目录：
+  - [acr-engine/data/raw/fma_small_audio/](../acr-engine/data/raw/fma_small_audio/)
+  - [acr-engine/data/raw/mtg_jamendo_audio/](../acr-engine/data/raw/mtg_jamendo_audio/)
+- 将这些目录入口链接接入开放数据工作流与 docs 总入口
+
+验证结果：
+- 本地目录已创建：
+  - `data/raw/`
+  - `data/raw/fma_small_audio/`
+  - `data/raw/mtg_jamendo_audio/`
+- `data/raw/README.md` 已包含可直接执行的下一条 smoke 命令模板
+
+结论：
+- 现在真实开放数据只需要放进明确目录即可
+- 后续替换真实 FMA / MTG-Jamendo 本地音频时无需再猜目录结构
+
 ### Stage: confused 定向优化 v6（sample-level weighting）
 
 完成项：

@@ -63,6 +63,10 @@ flowchart TD
 - [数据来源与接入](./dataset-sources-and-licensing.md)
 - [工业评测规范](./industrial-benchmark-spec.md)
 
+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
 - [服务接口](./service-api.md)
 - [更新记录](./CHANGELOG.md)

@@ -69,6 +69,11 @@ flowchart LR
 /usr/local/miniconda3/bin/python src/data/external_adapters.py smoke-local fma data/raw/fma_small_audio --output-root data/external_smoke --eval-ratio 0.2 --query-duration 8.0 --train-epochs 1 --batch-size 2
 ```
 
+真实目录放置位置可参考：
+- [acr-engine/data/raw/README.md](../acr-engine/data/raw/README.md)
+- [acr-engine/data/raw/fma_small_audio/](../acr-engine/data/raw/fma_small_audio/)
+- [acr-engine/data/raw/mtg_jamendo_audio/](../acr-engine/data/raw/mtg_jamendo_audio/)
+
 ---
 
 ## 4. 输出物说明