Fix missing SIGNAL_HANDLERs (#63404)

More missing signal handlers caught by dm-lua

code/modules/mob/living/carbon/carbon.dm

@@ -8,7 +8,6 @@
 	ADD_TRAIT(src, TRAIT_AGEUSIA, NO_TONGUE_TRAIT)
 
 	GLOB.carbon_list += src
-	RegisterSignal(src, COMSIG_LIVING_DEATH, .proc/attach_rot)
 	var/static/list/loc_connections = list(
 		COMSIG_CARBON_DISARM_PRESHOVE = .proc/disarm_precollide,
 		COMSIG_CARBON_DISARM_COLLIDE = .proc/disarm_collision,

code/modules/mob/living/simple_animal/hostile/mining_mobs/elites/elite.dm

@@ -191,6 +191,7 @@ While using this makes the system rely on OnFire, it still gives options for tim
 	INVOKE_ASYNC(src, .proc/arena_checks)
 
 /obj/structure/elite_tumor/proc/mychild_gone_missing()
+	SIGNAL_HANDLER
 	mychild = null
 
 /obj/structure/elite_tumor/proc/return_elite()
@@ -222,6 +223,7 @@ While using this makes the system rely on OnFire, it still gives options for tim
 	RegisterSignal(user, COMSIG_PARENT_QDELETING, .proc/clear_activator)
 
 /obj/structure/elite_tumor/proc/clear_activator(mob/source)
+	SIGNAL_HANDLER
 	if(!activator)
 		return
 	activator = null

code/modules/wiremod/components/atom/hear.dm

@@ -36,6 +36,7 @@
 	REMOVE_TRAIT(shell, TRAIT_HEARING_SENSITIVE, CIRCUIT_HEAR_TRAIT)
 
 /obj/item/circuit_component/hear/proc/on_shell_hear(datum/source, list/arguments)
+	SIGNAL_HANDLER
 	return Hear(arglist(arguments))
 
 /obj/item/circuit_component/hear/Hear(message, atom/movable/speaker, datum/language/message_language, raw_message, radio_freq, list/spans, list/message_mods)