Creates data_utils/v2a_utils/feature_utils_288.py with FeaturesUtils:
- T5-Gemma text encoding via transformers
- VideoPrism video encoding via JAX videoprism package
- Synchformer visual encoder loading from checkpoint
Also fixes extract_features.py to add plugin root to sys.path so
data_utils is importable in the subprocess venv.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
