README: configs split + case-collision fix

README.md

@@ -18,6 +18,13 @@ tags:
 - skel
 - joint-torque
 - motion-capture
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: manifest_train.csv
+  - split: test
+    path: manifest_test.csv
 ---
 
 # ForceBody
@@ -34,12 +41,16 @@ ForceBody/
 │   └── <subject_id_raw>/trial_<idx>.npz
 ├── trials_skelfit_only/               1,734 trials. SKEL + measured GRF + tau (no Monte Carlo)
 │   └── <subject_id_raw>/trial_<idx>.npz
-├── manifest.csv                        10,386 rows, one per trial
+├── manifest.csv                        10,386 rows, one per trial (full)
+├── manifest_train.csv                  9,649 train rows
+├── manifest_test.csv                     737 test rows
 ├── subjects.csv                        378 rows, one per subject_id_raw
 ├── ForceBody_sample.tar.gz             100-trial reviewer sample (157 MB)
 └── README.md
 ```
 
+Folder names use a study-prefix when needed to disambiguate identical subject names across source datasets (`Moore2015__subject7` vs `Uhlrich2023__subject7`). Subjects unique within their source dataset (e.g. `P002_split0` from Carter2023) appear without the prefix. The study prefix is also applied where two source studies use the same subject identifier under different capitalisation, so that the layout is safe on case-insensitive filesystems (Windows, macOS default).
+
 ## Quick start for reviewers (small sample)
 
 The full release is roughly 19 GB. For a fast first look, download the 100-trial sample (157 MB), which carries the same per-trial schema as the full release.