feat(card-frames): 보상 등급 가중 추첨 70/25/5 (Lua + JS 미러 rarityForRoll·경계 테스트)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/deck/gen-slaydeck.mjs

@@ -3999,9 +3999,20 @@ return pool`, [], 0, 'any'),
     method('OfferReward', `self:SetEntityEnabled("/ui/DefaultGroup/CardHand", false)
 self:SetEntityEnabled("/ui/DefaultGroup/DeckHud", false)
 local pool = self:CardPool()
+local byRarity = {}
+for _, id in ipairs(pool) do
+	local r = self.Cards[id].rarity or "normal"
+	if byRarity[r] == nil then byRarity[r] = {} end
+	table.insert(byRarity[r], id)
+end
 self.RewardChoices = {}
 for i = 1, 3 do
-	self.RewardChoices[i] = pool[math.random(1, #pool)]
+	local roll = math.random(1, 100)
+	local want = "normal"
+	if roll > 95 then want = "legend" elseif roll > 70 then want = "unique" end
+	local bucket = byRarity[want]
+	if bucket == nil or #bucket == 0 then bucket = pool end
+	self.RewardChoices[i] = bucket[math.random(1, #bucket)]
 	self:ApplyRewardVisual(i, self.RewardChoices[i])
 end
 local hud = _EntityService:GetEntityByPath("/ui/DefaultGroup/RewardHud")