I am looking for any information regarding the use of construction joints for permanent shotcrete wall facing.

In many experiences, the spacing and design of the joints are the same as you would expect for a cast in place wall. Walls have been constructed with no joint, with contraction and expansion joints, with a joint that is caulked, with joints containing waterstop, and just about anything else you might see in a cast in place wall. In short, it is suggested to look to the direction given for cast in place concrete. The construction joint should be designed similar to the needs of any cast in place wall.