Adds the exosuit ablative insulation module. A module that protects a mech from energy attacks and their wires from EMPs. But makes it weaker to ballistics and melee weapons. Adds a special version for nukie mechs. (#90845)

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## About The Pull Request

Adds the Ablative Insulation. A type of mech armor.

The armor module protects the mech from energy weapons (such as thermal
pistols), and also protects the wires from EMPs (only the wires, not the
mech itself). However, it makes it weaker against melee and ballistic
weapons.

The Dark Gygax and Mauler both obtain a version of this module as part
of their default loadout that does not have any disadvantages against
melee and ballistic weapons.

## Why It's Good For The Game

This is a complimentary PR to this one.
https://github.com/tgstation/tgstation/pull/90830

Wire scrambling for mechs is an extremely irritable system, but it does
force mech pilots out of the mech to repair some of the effects
attached. or at least to a standstill.

This can often feel a bit like a knowledge check to resolve for some
pilots, since the optimal solutions for this typically involve pulsing
the wires in some way, utilizing assemblies like voice analyzers,
circuits or signalers.

While I would like a more obvious way for pilots to resolve these
problems without having to set up signal networks, I do think it should
come at some expense in other defenses so that it isn't such a catchall
solution compared to the other armor booster modules. There would
otherwise be no reason not to use this armor booster if there was no
downside, since it completely negates a weakness. Therefore, we're
aiming for a slight upside/downside exchange. You get a very good
upside, but you now need to compensate for weaker defenses elsewhere
(such as risking internal damage effects due to lower armor, see this PR
https://github.com/tgstation/tgstation/pull/90844)

We've given nuclear operatives an improved version because their mechs
are A) expensive as shit, and B) meant to be a huge all-in but have
suffered immensely from many years of refactors, rebalances and gear
availability changes that definitely have left them underperforming for
their promised value. I would much rather nuclear operative mechs feel
like they are less beholden to the weaknesses that crew mechs need to
contend with if only because they exist for what might be a fraction of
the time, if they are even spawned at all due to their price.

## Changelog

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🆑
add: Adds the Exosuit Ablative Insulation armor booster module. Protects
the mech from energy-based attacks and its wires from EMPs (only the
wires, not the mech). However, the armor booster makes the mech weaker
to ballistic and melee weapons.
add: The Dark Gygax and Mauler now come pre-packaged with a special
version that has no weakness to ballistic and melee weapons.
/🆑

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code/modules/research/designs/mecha_designs.dm

@@ -615,7 +615,7 @@
 	departmental_flags = DEPARTMENT_BITFLAG_SCIENCE
 
 /datum/design/mech_ccw_armor
-	name = "Reactive Armor Booster Module"
+	name = "Exosuit Impact Cushion Plates"
 	desc = "Exosuit-mounted melee armor booster."
 	id = "mech_ccw_armor"
 	build_type = MECHFAB
@@ -636,7 +636,7 @@
 	departmental_flags = DEPARTMENT_BITFLAG_SCIENCE
 
 /datum/design/mech_proj_armor
-	name = "Reflective Armor Booster Module"
+	name = "Exosuit Projectile Shielding"
 	desc = "Exosuit-mounted ranged armor booster."
 	id = "mech_proj_armor"
 	build_type = MECHFAB
@@ -656,6 +656,27 @@
 	)
 	departmental_flags = DEPARTMENT_BITFLAG_SCIENCE
 
+/datum/design/mech_emp_armor
+	name = "Exosuit Ablative Insulation"
+	desc = "Exosuit-mounted energy and EMP armor booster. WARNING: This retrofit compromises exosuit hull plating stress points."
+	id = "mech_emp_armor"
+	build_type = MECHFAB
+	build_path = /obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster
+	materials = list(/datum/material/iron=SHEET_MATERIAL_AMOUNT*10,/datum/material/gold=SHEET_MATERIAL_AMOUNT * 2.5)
+	construction_time = 10 SECONDS
+	category = list(
+		RND_CATEGORY_MECHFAB_EQUIPMENT + RND_SUBCATEGORY_MECHFAB_EQUIPMENT_MODULES,
+		RND_CATEGORY_MECHFAB_RIPLEY + RND_SUBCATEGORY_MECHFAB_SUPPORTED_EQUIPMENT,
+		RND_CATEGORY_MECHFAB_ODYSSEUS + RND_SUBCATEGORY_MECHFAB_SUPPORTED_EQUIPMENT,
+		RND_CATEGORY_MECHFAB_PADDY + RND_SUBCATEGORY_MECHFAB_SUPPORTED_EQUIPMENT,
+		RND_CATEGORY_MECHFAB_GYGAX + RND_SUBCATEGORY_MECHFAB_SUPPORTED_EQUIPMENT,
+		RND_CATEGORY_MECHFAB_DURAND + RND_SUBCATEGORY_MECHFAB_SUPPORTED_EQUIPMENT,
+		RND_CATEGORY_MECHFAB_HONK + RND_SUBCATEGORY_MECHFAB_SUPPORTED_EQUIPMENT,
+		RND_CATEGORY_MECHFAB_PHAZON + RND_SUBCATEGORY_MECHFAB_SUPPORTED_EQUIPMENT,
+		RND_CATEGORY_MECHFAB_CLARKE + RND_SUBCATEGORY_MECHFAB_SUPPORTED_EQUIPMENT
+	)
+	departmental_flags = DEPARTMENT_BITFLAG_SCIENCE
+
 /datum/design/mech_diamond_drill
 	name = "Diamond Mining Drill"
 	desc = "An upgraded version of the standard drill."

code/modules/research/techweb/nodes/mech_nodes.dm

@@ -109,6 +109,7 @@
 	design_ids = list(
 		"mech_ccw_armor",
 		"mech_proj_armor",
+		"mech_emp_armor",
 		"paddyupgrade",
 		"mech_hydraulic_claw",
 		"mech_disabler",

code/modules/vehicles/mecha/combat/gygax.dm

@@ -54,14 +54,14 @@
 		MECHA_R_ARM = 1,
 		MECHA_UTILITY = 4,
 		MECHA_POWER = 1,
-		MECHA_ARMOR = 0,
+		MECHA_ARMOR = 1,
 	)
 	equip_by_category = list(
 		MECHA_L_ARM = /obj/item/mecha_parts/mecha_equipment/weapon/ballistic/scattershot,
 		MECHA_R_ARM = null,
 		MECHA_UTILITY = list(/obj/item/mecha_parts/mecha_equipment/radio, /obj/item/mecha_parts/mecha_equipment/air_tank/full, /obj/item/mecha_parts/mecha_equipment/thrusters/ion),
 		MECHA_POWER = list(),
-		MECHA_ARMOR = list(),
+		MECHA_ARMOR = list(/obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster/clandestine),
 	)
 	destruction_sleep_duration = 20
 

code/modules/vehicles/mecha/combat/marauder.dm

@@ -21,7 +21,7 @@
 		MECHA_R_ARM = 1,
 		MECHA_UTILITY = 5,
 		MECHA_POWER = 1,
-		MECHA_ARMOR = 0,
+		MECHA_ARMOR = 1,
 	)
 	bumpsmash = TRUE
 
@@ -45,7 +45,7 @@
 		MECHA_R_ARM = /obj/item/mecha_parts/mecha_equipment/weapon/ballistic/missile_rack,
 		MECHA_UTILITY = list(/obj/item/mecha_parts/mecha_equipment/radio, /obj/item/mecha_parts/mecha_equipment/air_tank/full, /obj/item/mecha_parts/mecha_equipment/thrusters/ion),
 		MECHA_POWER = list(),
-		MECHA_ARMOR = list(),
+		MECHA_ARMOR = list(/obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster/clandestine),
 	)
 
 /obj/vehicle/sealed/mecha/marauder/loaded/populate_parts()
@@ -105,14 +105,14 @@
 		MECHA_R_ARM = 1,
 		MECHA_UTILITY = 5,
 		MECHA_POWER = 1,
-		MECHA_ARMOR = 0,
+		MECHA_ARMOR = 1,
 	)
 	equip_by_category = list(
 		MECHA_L_ARM = /obj/item/mecha_parts/mecha_equipment/weapon/energy/pulse,
 		MECHA_R_ARM = /obj/item/mecha_parts/mecha_equipment/weapon/ballistic/missile_rack,
 		MECHA_UTILITY = list(/obj/item/mecha_parts/mecha_equipment/radio, /obj/item/mecha_parts/mecha_equipment/air_tank/full, /obj/item/mecha_parts/mecha_equipment/thrusters/ion),
 		MECHA_POWER = list(),
-		MECHA_ARMOR = list(),
+		MECHA_ARMOR = list(/obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster/clandestine),
 	)
 
 /datum/armor/mecha_seraph
@@ -140,7 +140,7 @@
 		MECHA_R_ARM = 1,
 		MECHA_UTILITY = 4,
 		MECHA_POWER = 1,
-		MECHA_ARMOR = 0,
+		MECHA_ARMOR = 1,
 	)
 	equip_by_category = list(
 		MECHA_L_ARM = null,
@@ -166,7 +166,7 @@
 		MECHA_R_ARM = /obj/item/mecha_parts/mecha_equipment/weapon/ballistic/missile_rack,
 		MECHA_UTILITY = list(/obj/item/mecha_parts/mecha_equipment/radio, /obj/item/mecha_parts/mecha_equipment/air_tank/full, /obj/item/mecha_parts/mecha_equipment/thrusters/ion),
 		MECHA_POWER = list(),
-		MECHA_ARMOR = list(),
+		MECHA_ARMOR = list(/obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster/clandestine),
 	)
 
 /obj/vehicle/sealed/mecha/marauder/mauler/loaded/Initialize(mapload)

code/modules/vehicles/mecha/equipment/tools/other_tools.dm

@@ -165,7 +165,7 @@
 	return ..()
 
 /obj/item/mecha_parts/mecha_equipment/armor/anticcw_armor_booster
-	name = "Impact Cushion Plates"
+	name = "exosuit impact cushion plates"
 	desc = "Boosts exosuit armor against melee attacks"
 	icon_state = "mecha_abooster_ccw"
 	iconstate_name = "melee"
@@ -176,7 +176,7 @@
 	melee = 20
 
 /obj/item/mecha_parts/mecha_equipment/armor/antiproj_armor_booster
-	name = "Projectile Shielding"
+	name = "exosuit projectile shielding"
 	desc = "Boosts exosuit armor against ranged kinetic and energy projectiles. Completely blocks taser shots."
 	icon_state = "mecha_abooster_proj"
 	iconstate_name = "range"
@@ -187,6 +187,36 @@
 	bullet = 15
 	laser = 15
 
+/obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster
+	name = "exosuit ablative insulation"
+	desc = "Boosts exosuit armor against energy-based attacks. Also shields the exosuit's internal wiring from hostile EMP attacks. However, this may leave the \
+		exosuit slightly more vulnerable to kinetic blows due to taking up valuable hull cushioning."
+	icon_state = "mecha_abooster_emp"
+	iconstate_name = "range"
+	protect_name = "EMP and Energy Armor"
+	armor_mod = /datum/armor/mecha_equipment_energy_boost
+
+/datum/armor/mecha_equipment_energy_boost
+	melee = -5
+	bullet = -10
+	energy = 15
+
+/obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster/attach(obj/vehicle/sealed/mecha/new_mecha, attach_right)
+	. = ..()
+	chassis.AddElement(/datum/element/empprotection, EMP_PROTECT_WIRES)
+
+/obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster/detach(atom/moveto)
+	chassis.RemoveElement(/datum/element/empprotection, EMP_PROTECT_WIRES)
+	return ..()
+
+/obj/item/mecha_parts/mecha_equipment/armor/antiemp_armor_booster/clandestine
+	name = "exosuit hardened ablative insulation"
+	desc = "Boosts exosuit armor against energy-based attacks. Also shields the exosuit's internal wiring from hostile EMP attacks."
+	armor_mod = /datum/armor/mecha_equipment_improved_energy_boost
+
+/datum/armor/mecha_equipment_improved_energy_boost
+	energy = 20
+
 ////////////////////////////////// REPAIR DROID //////////////////////////////////////////////////