HF RL Explorer

Feature: Replace --cuda toggle with --gpumask and enable parallel CPU/GPU extraction

Feature: Replace --cuda toggle with --gpumask and enable parallel CPU/GPU extraction: a task in LegoFlow-SWE (Harbor dataset). Currently, GPU feature extraction is controlled by the --cuda command‑line flag, which is a simple on/off switch. This is insufficient because:

The task

Currently, GPU feature extraction is controlled by the `--cuda` command‑line flag, which is a simple on/off switch. This is insufficient because:

Part of Lego-X/LegoFlow-SWE.