Allow AIs to greentext survive (#30959)

* Change AI objectives from survive to exist

* Cyberboss simplification

code/datums/antagonists/datum_traitor.dm

@@ -186,9 +186,9 @@
 			kill_objective.find_target()
 			add_objective(kill_objective)
 
-	var/datum/objective/survive/survive_objective = new
-	survive_objective.owner = owner
-	add_objective(survive_objective)
+	var/datum/objective/survive/exist/exist_objective = new
+	exist_objective.owner = owner
+	add_objective(exist_objective)
 /datum/antagonist/traitor/proc/forge_single_objective()
 	return 0
 /datum/antagonist/traitor/human/forge_single_objective() //Returns how many objectives are added

code/game/gamemodes/objective.dm

@@ -348,6 +348,14 @@
 			return FALSE
 	return TRUE
 
+//Like survive, but works for silicons and zombies and such.
+/datum/objective/survive/exist/considered_alive(var/datum/mind/M)
+	if(M && M.current)
+		if(isliving(M.current))
+			var/mob/living/L = M.current
+			return L.stat != DEAD
+	return FALSE
+
 /datum/objective/martyr
 	explanation_text = "Die a glorious death."