draft options working; spells won't cast though

Assets/_Project/Scripts/Core/BuilderSpellKind.cs

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+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,
+    }
+}

Assets/_Project/Scripts/Core/BuilderSpellKind.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a043765d6aa295a5397226e3e32d2c37

Assets/_Project/Scripts/Core/SpellTargetType.cs

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+namespace TD.Core
+{
+    /// <summary>
+    /// How a <see cref="TD.Gameplay.BuilderSpells.BuilderSpellDefinition"/> is aimed.
+    /// </summary>
+    /// <remarks>
+    /// Deliberately not named <c>TargetType</c> — that name is already taken in this
+    /// namespace by <see cref="TargetType"/> (Single/Splash/Chain/AllInRange, used by
+    /// <c>TowerDefinition</c>/<c>TowerCombat</c>), and every combat-adjacent file already
+    /// has <c>using TD.Core;</c>.
+    /// </remarks>
+    public enum SpellTargetType : byte
+    {
+        /// <summary>Aimed at a single ground point. No radius preview while aiming, even
+        /// if the spell has an internal splash radius.</summary>
+        PointTarget = 0,
+
+        /// <summary>Aimed at a ground point, affecting everything within
+        /// <see cref="TD.Gameplay.BuilderSpells.BuilderSpellDefinition.Radius"/>. Previewed
+        /// as a scaled radius decal while aiming.</summary>
+        AreaOfEffect = 1,
+    }
+}

Assets/_Project/Scripts/Core/SpellTargetType.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 0ebeda6f965b64f7ca82ecd6f849142a