Languages already matched the canonical reach instructions, so the three cell-3 reach datasets are merged as recorded: 2 episodes each for forward, right, and left. Dataset grows from 126 to 132 episodes.
Merge cell-3 demonstrations into single-arm BusyBox multitask
Keep the original 66 cell-1 episodes and add 60 cell-3 episodes (24 task datasets). Green-button cell-3 contributes only episodes 0-2 so it matches the other button tasks. Reach tasks have no cell-3 recordings. Cell-3 green-button language is normalized from "Push the green button." to the original "push the green button". Plugins and numeric stats are recomputed.
