And I suspect that "pulling up" part is a little harder to
visualize. What, for instance, is it pulling AGAINST?

The reason it's hard to visualize is that Bryan is correct; there is
no "suction force." If the pressure above and below the wing are
ambient, there is no net force because the two forces cancel. If you
lower the pressure above, the ambient pressure below the wing pushs
the wing upwards.

While a "suction force" is a useful fiction, like centrifugal force,
it can confuse an analysis if its origin is not understood.


Stalls:
At some value of high alpha, the low pressure ABOVE the wing exceeds
the shear value (viscosity) of air, and the flow "tears" loose.

Stalls happen because the air flow over the top of the wing run into
an increasing pressure along the back half of the wing, which slows
down the air. At some point, the air will move backwards The flow is
said to be "separated" at this point.

The "suction force" concept might be confusing the issue here too.

As we get down to within a wing span or so of the ground, and the
higher pressure on the bottom side actually does come into contact
with the ground, said high pressure area under the wing gets trapped
and is noticibly stronger.

Perhaps, but that suggests that Ground Effect is an increase in lift,
when in reality it's an decrease in drag.