refactor(trade): rename influence filter cost to count

"Cost" was the only occurrence of the term in this file: the rest of the
filter-budget path uses num_extra as the running count of structural
filter slots consumed before weighted mods fill the remainder. Align
with that convention: getInfluenceFilterCost becomes
countInfluenceFilters and the intermediate influenceFilterCost variable
is dropped in favour of a direct assignment to num_extra.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mcagnion

spec/System/TestTradeQueryGenerator_spec.lua

@@ -44,15 +44,15 @@ describe("TradeQueryGenerator", function()
 		local SHAPER = ANY + 1  -- 4
 		local ELDER  = ANY + 2  -- 5
 		local resolve = mock_queryGen._resolveInfluenceQueryState
-		local cost    = mock_queryGen._getInfluenceFilterCost
+		local count   = mock_queryGen._countInfluenceFilters
 		local needs   = mock_queryGen._needsHasInfluenceFilter
 
 		-- None: uses pseudo_has_influence=0 (1 slot instead of 6-slot NOT filter)
 		it("None uses 1-slot pseudo_has_influence=0", function()
 			local state = resolve(NONE, IGNORE)
 			assert.are.equal(state.exactCount, 0)
 			assert.is_true(state.hasNoneConstraint)
-			assert.are.equal(cost(state), 1)
+			assert.are.equal(count(state), 1)
 			assert.is_true(needs(state))
 		end)
 
@@ -62,7 +62,7 @@ describe("TradeQueryGenerator", function()
 			assert.are.equal(state.exactCount, 1)
 			assert.is_true(state.hasNoneConstraint)
 			assert.are.equal(#state.specificInfluenceModIds, 1)
-			assert.are.equal(cost(state), 2)
+			assert.are.equal(count(state), 2)
 			assert.is_true(needs(state))
 		end)
 
@@ -72,7 +72,7 @@ describe("TradeQueryGenerator", function()
 			assert.are.equal(state.exactCount, 2)
 			assert.is_false(state.hasNoneConstraint)
 			assert.are.equal(#state.specificInfluenceModIds, 2)
-			assert.are.equal(cost(state), 2)
+			assert.are.equal(count(state), 2)
 			assert.is_false(needs(state))
 		end)
 
@@ -81,7 +81,7 @@ describe("TradeQueryGenerator", function()
 			local state = resolve(ANY, IGNORE)
 			assert.are.equal(state.minCount, 1)
 			assert.are.equal(state.exactCount, nil)
-			assert.are.equal(cost(state), 1)
+			assert.are.equal(count(state), 1)
 			assert.is_true(needs(state))
 		end)
 
@@ -91,7 +91,7 @@ describe("TradeQueryGenerator", function()
 			assert.are.equal(state.exactCount, 2)
 			assert.is_false(state.hasNoneConstraint)
 			assert.are.equal(#state.specificInfluenceModIds, 1)
-			assert.are.equal(cost(state), 2)
+			assert.are.equal(count(state), 2)
 			assert.is_true(needs(state))
 		end)
 
@@ -112,7 +112,7 @@ describe("TradeQueryGenerator", function()
 			assert.are.equal(dup.hasNoneConstraint, paired.hasNoneConstraint)
 			assert.are.equal(#dup.specificInfluenceModIds, #paired.specificInfluenceModIds)
 			assert.are.equal(dup.specificInfluenceModIds[1], paired.specificInfluenceModIds[1])
-			assert.are.equal(cost(dup), cost(paired))
+			assert.are.equal(count(dup), count(paired))
 			assert.are.equal(needs(dup), needs(paired))
 		end)
 

src/Classes/TradeQueryGenerator.lua

@@ -192,7 +192,7 @@ local function needsHasInfluenceFilter(influenceState)
 	return influenceState.minCount ~= nil
 end
 
-local function getInfluenceFilterCost(influenceState)
+local function countInfluenceFilters(influenceState)
 	local cost = #influenceState.specificInfluenceModIds
 	if needsHasInfluenceFilter(influenceState) then
 		cost = cost + 1
@@ -1082,9 +1082,7 @@ function TradeQueryGeneratorClass:FinishQuery()
 
 	local options = self.calcContext.options
 	local influenceState = resolveInfluenceQueryState(options.influence1, options.influence2)
-	local influenceFilterCost = getInfluenceFilterCost(influenceState)
-
-	local num_extra = influenceFilterCost
+	local num_extra = countInfluenceFilters(influenceState)
 	if not options.includeMirrored then
 		num_extra = num_extra + 1
 	end
@@ -1226,7 +1224,7 @@ end
 
 -- Test accessors for influence query state logic (not used in production paths)
 TradeQueryGeneratorClass._resolveInfluenceQueryState = resolveInfluenceQueryState
-TradeQueryGeneratorClass._getInfluenceFilterCost = getInfluenceFilterCost
+TradeQueryGeneratorClass._countInfluenceFilters = countInfluenceFilters
 TradeQueryGeneratorClass._needsHasInfluenceFilter = needsHasInfluenceFilter
 TradeQueryGeneratorClass._hasAnyInfluenceModId = hasAnyInfluenceModId
 TradeQueryGeneratorClass._INFLUENCE_IGNORE_INDEX = INFLUENCE_IGNORE_INDEX