Document extrinsic config files

README.md

@@ -70,7 +70,7 @@ SP-TransientBench/
 |-- Reconstruction/         multi-view reconstruction scene archives
 |-- Annotations/            semantic annotation archives
 |-- Histgram/               semantic-track raw histograms and depth maps
-`-- config/                 SPL calibration, parsing settings, and IRF data
+`-- config/                 SPL calibration, extrinsics, parsing settings, and IRF data
 ```
 
 The full release is approximately `168.7 GB`. Large files are stored in the Hugging Face dataset repository and should be downloaded from the dataset files page or with Git LFS/Xet-compatible tooling.
@@ -201,6 +201,8 @@ The annotation pipeline identifies dominant peaks, assigns semantic labels to pe
 | `Histgram/` | Raw histogram packages and sequence-level depth maps for the semantic track |
 | `config/config.yaml` | SPL intrinsics, distortion coefficients, temporal bin width, image size, and parsing settings |
 | `config/IRF_global.csv` | Global instrument response function (IRF) measurements for transient calibration and analysis |
+| `config/final_extrinsic_sp_to_livox.txt` | SPL-to-Livox extrinsic calibration used for cross-sensor alignment |
+| `config/offset.txt` | Additional extrinsic offset parameters used for SPL/Livox alignment |
 | `fig/` | Dataset-card figures, qualitative examples, annotation diagrams, and statistics |
 
 ## Statistics