Production was switched from ep2 to ep3 based on separability and
length-calibration evidence (JOINT_TRAINING_CLOSEOUT_REPORT.md). Updates
start-model.sh's default and the README's setup instructions. The Drive
link itself still points to the ep2 file pending re-upload -- flagged
inline in the README.
Self-contained browser tool for exploring the Vox Day / Nuttall SFT
packages and generating scenes against the joint CPT+SFT model, plus a
portable launch script (start-model.sh) and setup README for running
the model server on a fresh machine (DGX Spark or CUDA/L40 box).
