Plaster in rope area-what does that feel like? Did they fill in the depression before they did the plaster job?
Coping cracks-have you been watering the coping as it cured? That will help slow the curing. It is very common for concrete for crack as is cures

I don't see any control joints.
Coping fix-that should even out as it cures. We saw one build where they had to redo an area. Within a couple of months you could not tell where the patch was.
Coping rebar-I am not sure but think most of the time rebar is not used in that area. I will ask
@AQUA~HOLICS for his thoughts on this as he does pools for a living.