The generator matrix

 1  0  1  1  1  0  1  1  X  1  1  X  1  1  0  1  1  X  1  1  0  1  1  X  1  1  1  1  X
 0  1  1  0 X+1  1  X X+1  1  X  1  1  0 X+1  1  X  1  1  0 X+1  1  X  1  1  0  0  0  X  X
 0  0  X  0  X  0  0  X  0  0  X  0  X  0  X  X  0  X  X  0  X  X  0  X  0  0  X  X  0
 0  0  0  X  X  X  X  0  X  0  X  0  X  0  0  X  0  0  0  X  X  0  X  X  0  X  X  0  0

generates a code of length 29 over Z2[X]/(X^2) who´s minimum homogenous weight is 28.

Homogenous weight enumerator: w(x)=1x^0+36x^28+16x^30+9x^32+2x^40

The gray image is a linear code over GF(2) with n=58, k=6 and d=28.
As d=28 is an upper bound for linear (58,6,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 6.
This code was found by Heurico 1.16 in 0.00388 seconds.