It seems as though all of the exercises I listed above should be okay. The only ones I'm concerned about are Squats & Lunges because the barbell sits on a meaty part of the back- do you think this will stretch the scar? As well as the back exercises (rows and deadlifts) I read somewhere that because you're "looking down" in these exercises it stretches the scar.. is that true? If it makes a difference, they're light weights
And for abdominals, I would think the plank/hoover and leg raises are okay but how about the side raises, do you think there's any risk of stretching from doing this exercise?