Add pets for tiers 4-6.

internal/game/game.go

@@ -45,6 +45,9 @@ type Player struct {
 	Trophies  int    `json:"trophies"`
 	Ready     bool   `json:"ready"` // arrange submitted / battle acknowledged
 	Connected bool   `json:"connected"`
+	// TripledThisRound records whether the player used the Triple (trade-in)
+	// action during the current round's shop (Bison's Battle Prep).
+	TripledThisRound bool `json:"tripledThisRound"`
 }
 
 // PetCount counts pet cards in the player's deck.
@@ -207,6 +210,7 @@ func (g *Game) startShopRound() {
 	for _, p := range g.Players {
 		p.Coins = CoinsPerRound
 		p.Ready = false
+		p.TripledThisRound = false
 	}
 	g.ShopRow = make([]Card, ShopRowSize)
 	for i := range g.ShopRow {
@@ -285,12 +289,17 @@ func (g *Game) Sell(playerID string, cardIDs []string) error {
 	return nil
 }
 
-// applyShopTrigger fires a shop-time trigger (buy/sell/triple) on one card.
+// applyShopTrigger fires a shop-time trigger (buy/sell/triple/battle prep)
+// on one card. Battle-time actions on the same trigger (Monkey's
+// applesInPlay) are ignored here and handled by the battle resolver.
 func (g *Game) applyShopTrigger(p *Player, c Card, trigger EffectTrigger) {
 	for _, e := range c.Effects {
 		if e.Trigger != trigger || g.Round < e.MinRound {
 			continue
 		}
+		if e.Condition == ConditionTripled && !p.TripledThisRound {
+			continue
+		}
 		switch e.Action {
 		case ActionGainApple:
 			for range e.count() {
@@ -298,6 +307,16 @@ func (g *Game) applyShopTrigger(p *Player, c Card, trigger EffectTrigger) {
 			}
 		case ActionRefreshGold:
 			p.Coins = min(p.Coins+e.count(), CoinsPerRound)
+		case ActionDoubleApples:
+			apples := 0
+			for _, dc := range p.Deck {
+				if dc.Food == FoodApple {
+					apples++
+				}
+			}
+			for range apples {
+				p.Deck = append(p.Deck, g.newApple())
+			}
 		}
 	}
 }
@@ -369,6 +388,7 @@ func (g *Game) TradeStart(playerID string, cardIDs []string) error {
 		p.Deck = slices.Delete(p.Deck, idx, idx+1)
 	}
 	p.Coins--
+	p.TripledThisRound = true
 	g.Pending = &PendingTrade{
 		PlayerID: playerID,
 		Tier:     nextTier,