More UX improvements.

README.md

@@ -81,7 +81,13 @@ Six rounds, each with its own shop tier deck. Per round:
 Apples and bees are **temporary**: they leave your deck after the battle.
 Most trophies after round 6 wins.
 
-All six tiers use the real card data:
+## Packs
+
+Two card packs are playable, chosen by the host in the lobby (a third,
+Unicorn, is stubbed for later). Each pack is six tiers, one per round, and
+every pet ships as two copies.
+
+### Turtle pack
 
 | Tier | Pets | Food |
 | ---- | ---- | ---- |
@@ -92,6 +98,29 @@ All six tiers use the real card data:
 | 5 | Monkey, Rhino, Crocodile, Scorpion, Seal, Shark, Turkey | Chili |
 | 6 | Gorilla, Fly, Leopard, Mammoth, Cat, Snake, Wolverine | Melon |
 
+### Golden pack
+
+| Tier | Pets | Food |
+| ---- | ---- | ---- |
+| 1 | Groundhog, Pied Tamarin, Chipmunk, Cone Snail, Bulldog, Opossum | — |
+| 2 | Black-Necked Stilt, Lizard, Hercules Beetle, Stoat, Desert Rain Frog, Honduran White Bat | — |
+| 3 | Guinea Fowl, Surgeon Fish, Osprey, Anteater, Bear, Royal Flycatcher, Flea | Avocado |
+| 4 | Saiga Antelope, Vaquita, Poison Dart Frog, Manta Ray, Slug, Cockatoo, Manatee | Potato |
+| 5 | Nyala, Nurse Shark, Giant Isopod, Blue-Ringed Octopus, Raccoon, Fire Ant, Macaque | Durian |
+| 6 | Highland Cow, Wildebeest, Grizzly Bear, Catfish, Komodo, Bird of Paradise, German Shepherd | Tomato |
+
+The Golden pack adds mechanics the Turtle pack doesn't have:
+
+- **Trumpets** — an ephemeral battle resource pets earn and spend mid-fight.
+- **Golden Retriever** — once per battle, a side that runs out of cards but
+  still holds Trumpets fields one, its power equal to those Trumpets.
+- **Avocado** — a persistent set-aside token you can discard in place of gold.
+- **Nurse Shark** — the one interactive battle moment: the fight pauses and
+  asks how many Trumpets to spend on rocks (the bot answers with a fixed
+  policy, so simulated rollouts stay valid).
+- **Cockatoo** — a shop-time reveal, plus Manta Ray's free first buy,
+  Blue-Ringed Octopus' per-buy apples, and more.
+
 ## Layout
 
 ```