All of the braking forces on a radially laced front wheel using a rim brake will be transmitted through the brake bosses and into the frame. There is some angular force as well being transmitted from the contact patch to the brake pads. This becomes radial force through the spokes. Weight transfer to the front wheel will occur as a result of braking which transfers force through the axles which also becomes radial force through the spokes. There's really no way for a rim-braked front wheel to transfer torsional load through the spokes as the hub will simply spin freely on its bearings as a result of any torsional load present. There might be some insignificant torsional load as a result of the friction in the bearings. If this is a concern, some lube might be in order.