π = P(YES | in-inventory) · φ = P(YES | out-inventory), a "repaint".
m = number of available words (∞ = unlimited invention, as in the classical NG).
Try π≈1, φ≈0 for the classical Naming Game, raise φ to see
noise stall consensus, or set m = 2 for the two-word sector of the mean-field theory.