I think it goes like this.

First case -
Looking at just the wing the stall is angle of attack related for a given Rn and Velocity, wing airfoil, roughness, etc. Assume we have an airplane that stalls at 1 g load factor. With the CG at the 25% chord point of the wing the tail load is zero and the aircraft stall is at a given angle of attack.

Second case -
When incorporated into an airplane with a forward CG the stall of the wing is still angle of attack related. Since the tail is down loaded on the airplane the wing will need to increase the angle of attack to try to keep the same 1 g load factor as in the first case. But it will stall if increased. So at the same given speed, etc. as the first case the airplane will stall at a lower load factor as a result.

Thrid case -
Since the tail load with an aft CG is up on the airplane the wing will need to decrease the angle of attack to try to keep the same 1 g load factor as in the first case. At the same given speed, etc. as the first case the airplane won't stall. It can go to the case one angle of attack and a higher load factor will result before stall as a result.

If you attempt to keep the load factors all the same before stall, say 1 g, then the comment

"4. What effect does a forward center of gravity have on an aircraft's flight characteristics?
Higher stall speed - stalling angle of attack is reached at a higher speed due to increased wing loading. "

seems to occur. But the airplane is stalling at a higher speed only because the speed to reach a 1g load factor requires an increase in velocity. It is just the reverse with the aft CG results.

But the comment - "stalling angle of attack is reached at a higher speed " isn't true. The quoted statement should read,

"Higher stall speed - Airplane stall occurs at a higher speed when attempting to maintain a constant load factor."

and similiarly stated for the aft CG cases each of which is not the same as the "stalling angle of attack". The stalling angle of attack of the wing is the same in each case. Johng is correct in his statements.