feat(buildings): add 3 special buildings for key Scadrial locations

Add Kredik Shaw (Lord Ruler's palace — prestige, piety, dread, control),
Pits of Hathsin (atium mine — gold income, tax, negative opinion), and
Conventical of Seran (Inquisitor HQ — piety, martial, dread, scheme
power). All use type=special with barony-locked can_construct triggers.
Pre-built via province history so they exist at game start.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lords_of_ash/common/buildings/00_mistborn_special_buildings.txt

@@ -0,0 +1,123 @@
+############################################
+# Mistborn: The Final Empire - Special Buildings
+# Unique buildings tied to specific provinces
+############################################
+
+# Kredik Shaw - The Hill of a Thousand Spires
+# The Lord Ruler's palace complex in central Luthadel
+kredik_shaw = {
+	construction_time = slow_construction_time
+
+	type = special
+
+	can_construct_potential = {
+		building_requirement_tribal = no
+	}
+
+	can_construct = {
+		barony = title:b_kredik_shaw
+	}
+
+	is_enabled = {
+		always = yes
+	}
+
+	cost_gold = 0
+
+	county_modifier = {
+		monthly_county_control_growth_add = 0.5
+		tax_mult = 0.15
+		development_growth_factor = 0.1
+	}
+
+	character_modifier = {
+		monthly_prestige = 2
+		monthly_piety = 1
+		dread_baseline_add = 20
+	}
+
+	flag = special_building
+
+	ai_value = {
+		base = 100
+	}
+}
+
+# Pits of Hathsin - Atium Mining Prison
+# A brutal prison camp where skaa mine atium geodes
+pits_of_hathsin = {
+	construction_time = slow_construction_time
+
+	type = special
+
+	can_construct_potential = {
+		building_requirement_tribal = no
+	}
+
+	can_construct = {
+		barony = title:b_pits_of_hathsin
+	}
+
+	is_enabled = {
+		always = yes
+	}
+
+	cost_gold = 0
+
+	county_modifier = {
+		monthly_county_control_growth_add = -0.3
+		county_opinion_add = -20
+		tax_mult = 0.3
+	}
+
+	character_modifier = {
+		monthly_prestige = 0.5
+		monthly_income = 2
+		tyranny_gain_mult = 0.2
+	}
+
+	flag = special_building
+
+	ai_value = {
+		base = 80
+	}
+}
+
+# Conventical of Seran - Canton of Inquisition Headquarters
+# The primary research base of the Steel Inquisitors
+conventical_of_seran = {
+	construction_time = slow_construction_time
+
+	type = special
+
+	can_construct_potential = {
+		building_requirement_tribal = no
+	}
+
+	can_construct = {
+		barony = title:b_conventical_of_seran
+	}
+
+	is_enabled = {
+		always = yes
+	}
+
+	cost_gold = 0
+
+	county_modifier = {
+		monthly_county_control_growth_add = 0.3
+	}
+
+	character_modifier = {
+		monthly_piety = 1
+		martial = 2
+		dread_baseline_add = 15
+		hostile_scheme_power_mult = 0.15
+	}
+
+	flag = special_building
+
+	ai_value = {
+		base = 60
+	}
+}

lords_of_ash/history/provinces/00_mistborn_provinces.txt

@@ -16,6 +16,9 @@
 	culture = noble_scadrian
 	religion = steel_ministry
 	holding = castle_holding
+	buildings = {
+		kredik_shaw
+	}
 }
 2047 = {
 	# Luthadel City - Capital of the Final Empire
@@ -140,6 +143,9 @@
 	culture = noble_scadrian
 	religion = steel_ministry
 	holding = church_holding
+	buildings = {
+		conventical_of_seran
+	}
 }
 
 # --- c_suisna (d_south_seran) ---
@@ -546,6 +552,9 @@
 	culture = noble_scadrian
 	religion = steel_ministry
 	holding = castle_holding
+	buildings = {
+		pits_of_hathsin
+	}
 }
 2481 = {
 	# Pits Garrison

lords_of_ash/localization/english/mistborn_buildings_l_english.yml

@@ -0,0 +1,12 @@
+l_english:
+
+ # ========== SPECIAL BUILDINGS ==========
+
+ kredik_shaw:0 "Kredik Shaw"
+ kredik_shaw_desc:0 "The Hill of a Thousand Spires. The Lord Ruler's palace complex in the heart of Luthadel, a massive fortress of twisting metal towers that dominates the skyline. From here, the Sliver of Infinity has ruled the Final Empire for a thousand years."
+
+ pits_of_hathsin:0 "The Pits of Hathsin"
+ pits_of_hathsin_desc:0 "A brutal prison camp where skaa are worked to death mining atium geodes from crystalline caverns beneath the earth. Considered inescapable — those who enter rarely see the sky again. The atium it produces fuels the Lord Ruler's economy and his Mistborn's power."
+
+ conventical_of_seran:0 "Conventical of Seran"
+ conventical_of_seran_desc:0 "The primary research base of the Canton of Inquisition. Steel Inquisitors study Hemalurgy and interrogate prisoners within its dark halls. The screams that echo from its depths have given rise to a thousand skaa nightmares."