A lot of IPC rework bugfixes. (#22561)

- bugfix: "Synthetic external armour now deteriorates with the actual
damage taken. Previously, the calculation led to the armour instead
taking less damage the less it was blocked."
- bugfix: "Fixing the synthetic endoskeleton now fixes the permanent
paincrit effect on IPCs. This was caused by the self preservation status
being toggled when the endoskeleton was destroyed, but it was never
reset when the endoskeleton was fixed."
- bugfix: "Species components are now added and removed properly,
meaning you can switch from IPC to human and back and forth as a
mercenary once more."
- bugfix: "The Bishop internal PDA now uses your actual ID on your
person as its own ID."
- bugfix: "Fixed the endoskeleton welder repair surgery. You can do this
surgery by using a welder while aiming chest and after having opened the
chest fully."
- bugfix: "The endoskeleton now takes damage from EMPs as well. This
should make them A LOT more effective against IPCs."
  - qol: "The posibrain will now show up in diagnostics."
- rscadd: "Posibrains can now be destroyed by hitting them. This will
completely kill the IPC's consciousness!"

Co-authored-by: Matt Atlas <liermattia@gmail.com>

code/modules/organs/internal/species/machine/_generic.dm

@@ -62,6 +62,11 @@
 	electronics.heal_damage(electronics.max_integrity)
 	integrity_event_cooldown = initial(integrity_event_cooldown)
 
+/obj/item/organ/internal/machine/heal_damage(amount)
+	. = ..()
+	if(initial(diagnostics_suite_visible) && !diagnostics_suite_visible)
+		diagnostics_suite_visible = TRUE
+
 /obj/item/organ/internal/machine/process(seconds_per_tick)
 	..()
 	if(!owner)
@@ -107,11 +112,17 @@
 
 /obj/item/organ/internal/machine/emp_act(severity)
 	. = ..()
+	var/damage_taken
 	switch(severity)
 		if(EMP_HEAVY)
-			take_internal_damage(4 * emp_coeff)
+			damage_taken = 15 * emp_coeff
+			take_internal_damage(damage_taken)
 		if(EMP_LIGHT)
-			take_internal_damage(2 * emp_coeff)
+			damage_taken = 10 * emp_coeff
+			take_internal_damage(damage_taken)
+
+	if(damage_taken)
+		SEND_SIGNAL(owner, COMSIG_DAMAGE_TO_ENDOSKELETON, damage_taken)
 
 /**
  * Called when prefs are synced to the organ to set the proper synthetic organ preset. Turns the pref into a preset singleton.

code/modules/organs/internal/species/machine/posibrain.dm

@@ -7,7 +7,6 @@
 	parent_organ = BP_HEAD
 	vital = TRUE
 	robotic_sprite = FALSE
-	diagnostics_suite_visible = FALSE
 
 	emp_coeff = 0.5
 
@@ -15,6 +14,9 @@
 
 	relative_size = 85
 
+	maxhealth = OBJECT_HEALTH_MEDIUM
+	should_use_health = TRUE
+
 	/// The type of 'robotic brain'. Must be a subtype of /obj/item/mmi/digital.
 	var/robotic_brain_type = /obj/item/mmi/digital/posibrain
 	/// The stored MMI object.
@@ -61,6 +63,13 @@
 	QDEL_NULL(sizzle)
 	return ..()
 
+/obj/item/organ/internal/machine/posibrain/on_death(damage, damage_flags, damage_type, armor_penetration, obj/weapon)
+	playsound(src, SFX_BREAK_GLASS, 100, 1)
+	visible_message(SPAN_DANGER("\The [src] shatters spectacularly into a million pieces!"))
+	to_chat(owner, SPAN_DANGER("Your vision goes dark as your posibrain is destroyed, and your consciousness ceases to be."))
+	new /obj/effect/decal/cleanable/blood/gibs/robot(get_turf(src))
+	. = ..()
+
 /obj/item/organ/internal/machine/posibrain/rejuvenate()
 	. = ..()
 	SEND_SIGNAL(owner, COMSIG_SYNTH_ENDOSKELETON_FULL_REPAIR)

code/modules/organs/internal/species/machine/wireless_access.dm

@@ -75,6 +75,11 @@
 		else
 			crash_with("Something terrible happened in synthetic internal PDA init! Loc: [loc]")
 
+/obj/item/modular_computer/handheld/pda/synthetic_internal/GetID()
+	var/obj/item/organ/internal/machine/wireless_access/access_point = loc
+	if(access_point.owner)
+		return access_point.owner.GetIdCard()
+
 /obj/item/modular_computer/handheld/pda/synthetic_internal/Destroy()
 	if(access_point)
 		access_point.internal_pda = null

code/modules/organs/organ_external.dm

@@ -505,7 +505,7 @@
 	add_pain(0.6 * burn + 0.4 * brute)
 
 	if(owner)
-		SEND_SIGNAL(owner, COMSIG_EXTERNAL_ORGAN_DAMAGE, burn + brute)
+		SEND_SIGNAL(owner, COMSIG_DAMAGE_TO_ENDOSKELETON, burn + brute)
 
 	//If there are still hurties to dispense
 	if (spillover)