Makes Runes actually invisible to AIs (#22947)

code/game/gamemodes/cult/runes.dm

@@ -27,6 +27,7 @@ To draw a rune, use a ritual dagger.
 	mouse_opacity = MOUSE_OPACITY_OPAQUE // So that runes aren't so hard to click
 	var/visibility = 0
 	var/view_range = 7
+	invisibility = 25
 	layer = SIGIL_LAYER
 	color = COLOR_BLOOD_BASE
 
@@ -126,7 +127,7 @@ To draw a rune, use a ritual dagger.
 	alpha = 100 //To help ghosts distinguish hidden runes
 
 /obj/effect/rune/cult_reveal() //for revealing spell
-	invisibility = 0
+	invisibility = initial(invisibility)
 	visible_message("<span class='danger'>[src] suddenly appears!</span>")
 	alpha = initial(alpha)
 

code/modules/mob/living/silicon/ai/ai_login.dm

@@ -1,10 +1,5 @@
 /mob/living/silicon/ai/Login()	//ThisIsDumb(TM) TODO: tidy this up �_� ~Carn
 	..()
-	for(var/obj/effect/rune/rune in world)
-		var/image/blood = image(loc = rune)
-		blood.override = 1
-		client.images += blood
-	regenerate_icons()
 
 	if(stat != DEAD)
 		for(var/obj/machinery/ai_status_display/O as anything in GLOB.ai_displays) //change status