diff --git a/lib/game/models/booster.dart b/lib/game/models/booster.dart
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+++ b/lib/game/models/booster.dart
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+// lib/game/models/booster.dart
+
+/// The three boosters the player can earn and spend. Pure model so the data
+/// and state layers can both reference it without a Flutter dependency.
+enum BoosterType { hammer, shuffle, lineBomb }