fix(events): replace negative add_gold with remove_short_term_gold

CK3 does not support negative values for add_gold. Replaced all 14
instances across 6 event files with remove_short_term_gold, which
is the correct CK3 effect for deducting gold.

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

lords_of_ash/events/atium_events.txt

@@ -103,7 +103,7 @@ mistborn_atium.0002 = {
 	# Option A: Bribe the Obligator to look away
 	option = {
 		name = mistborn_atium.0002.a
-		add_gold = -300
+		remove_short_term_gold = 300
 		add_prestige = -100
 		# Reduce the attention gained
 		change_variable = {
@@ -144,7 +144,7 @@ mistborn_atium.0002 = {
 	# Option C: Accept punishment
 	option = {
 		name = mistborn_atium.0002.c
-		add_gold = -500
+		remove_short_term_gold = 500
 		add_prestige = -200
 		add_piety = 30
 		# Full contrition reduces attention

lords_of_ash/events/ball_events.txt

@@ -33,7 +33,7 @@ mistborn_ball.0001 = {
 			flag = recently_hosted_ball
 			years = 2
 		}
-		add_gold = -100
+		remove_short_term_gold = 100
 	}
 
 	# The ball begins - select what to focus on

lords_of_ash/events/lord_ruler_events.txt

@@ -39,7 +39,7 @@ mistborn_lord_ruler.0001 = {
 	# Option A: Submit - Pay tribute and grovel
 	option = {
 		name = mistborn_lord_ruler.0001.a
-		add_gold = -200
+		remove_short_term_gold = 200
 		add_prestige = -100
 		change_variable = {
 			name = lord_ruler_attention
@@ -175,7 +175,7 @@ mistborn_lord_ruler.0010 = {
 				}
 			}
 		}
-		add_gold = -500
+		remove_short_term_gold = 500
 		add_prestige = -300
 		# Lose a title if holding multiple
 		random_held_title = {
@@ -255,7 +255,7 @@ mistborn_lord_ruler.0010 = {
 						}
 					}
 				}
-				add_gold = -300
+				remove_short_term_gold = 300
 				add_prestige = -200
 				change_variable = {
 					name = lord_ruler_attention
@@ -414,7 +414,7 @@ mistborn_lord_ruler.0020 = {
 			}
 		}
 
-		add_gold = -1000
+		remove_short_term_gold = 1000
 		add_prestige = -500
 		add_trait = wounded_3
 		add_stress = 100

lords_of_ash/events/mistborn_misc_events.txt

@@ -31,7 +31,7 @@ mistborn_misc.0001 = {
 	# Option A: Infiltrate a rival court
 	option = {
 		name = mistborn_misc.0001.a
-		add_gold = -200
+		remove_short_term_gold = 200
 		# Find a rival to infiltrate
 		random_neighboring_top_liege_realm_owner = {
 			limit = {
@@ -59,7 +59,7 @@ mistborn_misc.0001 = {
 	# Option B: Gather secrets from within your own court
 	option = {
 		name = mistborn_misc.0001.b
-		add_gold = -150
+		remove_short_term_gold = 150
 		add_intrigue_lifestyle_xp = 75
 		# Discover hidden plots
 		random_list = {
@@ -79,7 +79,7 @@ mistborn_misc.0001 = {
 	# Option C: Use the kandra for assassination
 	option = {
 		name = mistborn_misc.0001.c
-		add_gold = -300
+		remove_short_term_gold = 300
 		add_tyranny = 10
 		add_stress = 20
 		stress_impact = {
@@ -297,7 +297,7 @@ mistborn_misc.0020 = {
 	# Option B: Negotiate and offer concessions
 	option = {
 		name = mistborn_misc.0020.b
-		add_gold = -100
+		remove_short_term_gold = 100
 		add_prestige = -25
 		# Reduces tension more effectively
 		stress_impact = {

lords_of_ash/events/skaa_allomancer_events.txt

@@ -56,7 +56,7 @@ mistborn_skaa_allomancer.0001 = {
 	# Option B: Train them properly as a Hazekiller commander
 	option = {
 		name = mistborn_skaa_allomancer.0001.b
-		add_gold = -100
+		remove_short_term_gold = 100
 		scope:skaa_recruit = {
 			set_employer = root
 			add_trait = brave
@@ -190,7 +190,7 @@ mistborn_skaa_allomancer.0002 = {
 	# Option C: Claim ignorance and pay a fine
 	option = {
 		name = mistborn_skaa_allomancer.0002.c
-		add_gold = -200
+		remove_short_term_gold = 200
 		add_prestige = -100
 		# Moderate reduction
 		change_variable = {

lords_of_ash/events/snapping_events.txt

@@ -208,7 +208,7 @@ mistborn_snapping.0010 = {
 	# Option C: Hire professionals - expensive but safest
 	option = {
 		name = mistborn_snapping.0010.c
-		add_gold = -150
+		remove_short_term_gold = 150
 		add_stress = 10
 		scope:snapping_target = {
 			random_list = {