I'm looking for an adjective that describes someone who is never at rest; they are constantly thinking of / planning to do something positive. 'Scheme' or 'plot' would work, but those two words have an inherent negative connotation.
You are looking to define two different dimensions
Cunning, shrewd, imaginative.
Active, activist, motivated, engaged.
A good leader is cunning dealing with adversaries, shrewd when interacting with allies and imaginative in treating the issues of society.
An effective leader is active in anticipating problems, activist in exposing and overturning ineffective practices, motivated in improving the conditions of society, and engaged in the efforts that would lead to the proper functioning of society.