draft options working; spells won't cast though

Assets/_Project/Scripts/Core/BuilderSpellKind.cs

@@ -0,0 +1,15 @@
+namespace TD.Core
+{
+    /// <summary>
+    /// Identifies which builder spell a
+    /// <see cref="TD.Gameplay.BuilderSpells.BuilderSpellDefinition"/> represents. Mirrors
+    /// <see cref="BuilderEffectKind"/> — a stable, enum-indexed identifier used by
+    /// <see cref="TD.Gameplay.BuilderSpells.BuilderSpellPool"/> and
+    /// <see cref="TD.Gameplay.SpellSlot"/> instead of an asset reference.
+    /// </summary>
+    public enum BuilderSpellKind : byte
+    {
+        Fireball = 0,
+        SlowArea = 1,
+    }
+}