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What if you consider the opposing force (rather than the reaction force),
As an object undergoes an upward displacement the gravitation force on it
does negative work, but the work done by the reaction force, which acts on
the planet, does no work. (I am assuming we are in a reference frame in
which the planet is stationary.) In this case the work done by the
matching force is zero..
The total work total workI think that perhaps this is how to define potential energy? Once that's
done by an action-reaction pair is non zero only when there is a change
in the configuration of the system, and the negative of this total work
represents the corresponding change in the system's potential energy.