WIP: Adjusting normalize atom proc to to the new tape runtime convention. Trying to reduce redundant scuff to scratch.

code/hello_camera/hello_camera.c

@@ -151,13 +151,13 @@ internal void compile_init_atoms(void) {
 
 	smem.normalize_v3s4 = build_normalize_v3s4(& ab,
 		RegUse_(build_normalize_v3s4) {
-			.scratch     = ralloc(),
 			.src_ptr     = ralloc(),
 			.dst_ptr     = ralloc(),
 			.recip_est   = ralloc(),
 			.norm        = ralloc(),
 			.shift       = ralloc(),
 			.src_x       = ralloc(),
+			.src_z       = ralloc(),
 			// .shift_count = ralloc(),    /* dedicated slot for stage-3 → stage-4 shift count */
 			.t3          = ralloc(),
 			.t4          = ralloc(),