Add pipeline tag

This PR adds the missing `pipeline_tag: other` to the model card metadata, making the model discoverable under the "Other" pipeline category on the Hugging Face Hub.

README.md

@@ -1,13 +1,14 @@
 ---
-license: mit
 library_name: pytorch
+license: mit
+pipeline_tag: other
 tags:
-  - semantic-scene-completion
-  - lidar
-  - semantickitti
-  - diffusion
-  - autonomous-driving
-  - 3d
+- semantic-scene-completion
+- lidar
+- semantickitti
+- diffusion
+- autonomous-driving
+- 3d
 ---
 
 # GSSC-S2D2 — released checkpoints
@@ -158,4 +159,4 @@ in the code repository.
 
 Please also cite [SemanticKITTI](https://semantic-kitti.org/) as the source
 dataset, and the relevant base model (SCPNet, JS3C-Net or LMSCNet) when using
-a cross-base checkpoint.
+a cross-base checkpoint.