Reveal tripled-in pets but keep the pick secret unless it buys.

internal/game/game.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"math/big"
 	"slices"
+	"strings"
 )
 
 // Tunable rules. The engine supports any player count >= 2; MinPlayers /
@@ -369,6 +370,17 @@ func (g *Game) sellCards(p *Player, cardIDs []string) error {
 	return nil
 }
 
+// hasBuyEffect reports whether a card carries any buy-triggered ability, which
+// means acquiring it does something visible to everyone.
+func hasBuyEffect(c Card) bool {
+	for _, e := range c.Effects {
+		if e.Trigger == TriggerBuy {
+			return true
+		}
+	}
+	return false
+}
+
 // TradeStart spends one coin and three same-suit pets from the player's deck
 // to reveal the top two cards of the next tier's deck. The player must then
 // call TradeChoose before anything else happens.
@@ -412,7 +424,14 @@ func (g *Game) TradeStart(playerID string, cardIDs []string) error {
 	}
 	p.Coins--
 	p.TripledThisRound = true
-	g.logf(p.Seat, "🔄", "%s traded in 3 %s pets for a tier %d pick.", p.Name, suit, nextTier)
+	// The discarded trio is public — everyone sees what was given up — even
+	// though the pet ultimately chosen stays secret (see TradeChoose).
+	names := make([]string, len(traded))
+	for i, c := range traded {
+		names[i] = c.Name
+	}
+	g.logf(p.Seat, "🔄", "%s traded in %s (%s) for a tier %d pick.",
+		p.Name, strings.Join(names, ", "), suit, nextTier)
 	g.Pending = &PendingTrade{
 		PlayerID: playerID,
 		Tier:     nextTier,
@@ -440,7 +459,15 @@ func (g *Game) TradeChoose(playerID string, pick int) error {
 	tierIdx := g.Pending.Tier - 1
 	g.ShopDecks[tierIdx] = append(g.ShopDecks[tierIdx], other)
 	g.Pending = nil
-	g.logf(p.Seat, "🔄", "%s picked %s from the trade.", p.Name, chosen.Name)
+	// The pick is secret — opponents never saw the two revealed options and
+	// can't see the deck. But a pet with a Buy ability performs it publicly, so
+	// we have to reveal that pet (its effect log names it anyway).
+	if hasBuyEffect(chosen) {
+		g.logf(p.Seat, "🔄", "%s's trade pick is %s %s — its buy ability triggers.",
+			p.Name, article(chosen.Name), chosen.Name)
+	} else {
+		g.logf(p.Seat, "🔄", "%s keeps their trade pick hidden.", p.Name)
+	}
 	// Pets obtained via the Triple action trigger their Buy effects.
 	g.applyShopTrigger(p, chosen, TriggerBuy)
 	g.advanceShopTurn()