pushblock/medium-v0: re-record with the action-label gap fix (61.0% of rows held a placeholder 0); band U(2.1,3.2) unchanged

pushblock/medium-v0: fixed-T -> per-episode softmax-temperature-range tier (T~U(2.1,3.2) per episode, step-reward norm 0.7984)

pushblock/medium-v0: replace epsilon tier with softmax-temperature tier (T=2.8, step-reward calibrated)

feat(pushblock): medium tier, per-episode epsilon pool