Update .gitignore to include new directories for combined data and Hugging Face cache. Modify VLM prompt in droid_vlm_demo for improved specificity in task description.

Author: Your Name

examples/droid/.gitignore

@@ -3,4 +3,6 @@ robodm_trajectories/
 vlm_analysis_results/
 full_robodm_trajectories/
 f1_matrix_results/
-trajectory_captioning_results/
+trajectory_captioning_results/
+droid_combined_data/
+huggingface_cache/