Add three new analysis scripts for dataset quality insight:
- create_frame_grid.py: random frame grid JPG for visual inspection
- workspace_density.py: 3D TCP trajectory clustering with K-means
- action_consistency.py: KNN-based action-state consistency analysis
with action chunk support (default chunk=30) matching policy learning
Also update create_progress_videos.py with configurable camera selection.
Made-with: Cursor
Pepijn