Do I need some kind of paste between carbon steerer and steel stem?
No, there's more than enough grip without it. If your fork resists enough handlebar input torque to make it move, you have already crashed.
No, there's more than enough grip
I wasn't concerned about grip, more about dry assembly between steel and carbon, some kind of grease, but chemically friendly with carbon?
Dry is fine, but carbon assembly paste won't do any harm if it puts your mind at rest.
@veLLo started
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No, there's more than enough grip without it. If your fork resists enough handlebar input torque to make it move, you have already crashed.