Give ghosts the ability to examine BCIs (tgstation#60500)

Examining a mob with a BCI inside them will now give you the ability to look at it. Helpful for admins, but also keeps in line with every other circuit shell.

code/modules/wiremod/shell/brain_computer_interface.dm

@@ -224,6 +224,7 @@
 	user_port.set_output(owner)
 	user = WEAKREF(owner)
 
+	RegisterSignal(owner, COMSIG_PARENT_EXAMINE, .proc/on_examine)
 	RegisterSignal(owner, COMSIG_PROCESS_BORGCHARGER_OCCUPANT, .proc/on_borg_charge)
 	RegisterSignal(owner, COMSIG_LIVING_ELECTROCUTE_ACT, .proc/on_electrocute)
 
@@ -234,6 +235,7 @@
 	user = null
 
 	UnregisterSignal(owner, list(
+		COMSIG_PARENT_EXAMINE,
 		COMSIG_PROCESS_BORGCHARGER_OCCUPANT,
 		COMSIG_LIVING_ELECTROCUTE_ACT,
 	))
@@ -258,6 +260,21 @@
 	parent.cell.give(shock_damage * 2)
 	to_chat(source, span_notice("You absorb some of the shock into your [parent.name]!"))
 
+/obj/item/circuit_component/bci_core/proc/on_examine(datum/source, mob/mob, list/examine_text)
+	SIGNAL_HANDLER
+
+	if (isobserver(mob))
+		examine_text += span_notice("[source.p_they(capitalized = TRUE)] [source.p_have()] <a href='?src=[REF(src)];open_bci=1'>\a [parent] implanted in [source.p_them()]</a>.")
+
+/obj/item/circuit_component/bci_core/Topic(href, list/href_list)
+	..()
+
+	if (!isobserver(usr))
+		return
+
+	if (href_list["open_bci"])
+		parent.attack_ghost(usr)
+
 /datum/action/innate/bci_charge_action
 	name = "Check BCI Charge"
 	check_flags = NONE