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Fixes https://github.com/microsoft/rhobotics/issues/53 for this checkpoint.

stats.json and data_config.json were copies of rho-base's, made for a TabletopSim dataset. This PR replaces them with this checkpoint's own:

• stats.json: statistics of the FR3 Duo dataset, with absolute grippers and q01/q99 action-chunk quantiles. Unused q02/q98 entries are removed.
• data_config.json: repo_id: rho-fr3-duo, this dataset's key names, state and actions read from the quaternion keys and converted to 6-D, and use_absolute_grippers: true.

The policy's state input and action output now use the 16-value quaternion layout (position, quaternion x/y/z/w and gripper per arm) instead of 20 values with 6-D rotations.

Verified with rhobotics main (d766e66): the checkpoint loads and returns finite actions.