start of draft option upgrades

Assets/_Project/Scripts/Gameplay/Draft/BuilderEffectUpgradeDraftOption.cs

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+// Assets/_Project/Scripts/Gameplay/Draft/BuilderEffectUpgradeDraftOption.cs
+using UnityEngine;
+using TD.Core;
+using TD.Gameplay.BuilderEffects;
+
+namespace TD.Gameplay.Draft
+{
+    /// <summary>
+    /// Draft choice — "upgrade a builder effect you already have". Replaces
+    /// <see cref="BaseKind"/> with <see cref="UpgradedKind"/> in the player's
+    /// <see cref="BuilderUpgradeManager"/>.
+    /// </summary>
+    /// <remarks>
+    /// Mirrors <see cref="BuilderEffectDraftOption"/>, but swaps rather than adds. Only offered
+    /// while the player currently has <see cref="BaseKind"/> granted — once taken,
+    /// <see cref="BaseKind"/> is removed, which automatically makes this option (and any sibling
+    /// upgrade branching off the same base) invalid for future drafts.
+    /// </remarks>
+    [CreateAssetMenu(fileName = "BuilderEffectUpgradeOption",
+                      menuName = "TD/Draft/Builder Effect Upgrade Option")]
+    public class BuilderEffectUpgradeDraftOption : DraftOption
+    {
+        [Header("Payload")]
+        [Tooltip("The builder effect this option upgrades from.")]
+        public BuilderEffectKind BaseKind;
+
+        [Tooltip("The builder effect this option upgrades to.")]
+        public BuilderEffectKind UpgradedKind;
+
+        public override bool IsValidFor(ulong clientId)
+        {
+            var upgrades = BuilderUpgradeManager.GetForClient(clientId);
+            return upgrades != null && upgrades.PlayerHasEffect(BaseKind);
+        }
+
+        public override bool ServerApply(ulong clientId)
+        {
+            var upgrades = BuilderUpgradeManager.GetForClient(clientId);
+            return upgrades != null && upgrades.ServerUpgradeEffect(BaseKind, UpgradedKind);
+        }
+    }
+}

Assets/_Project/Scripts/Gameplay/Draft/BuilderSpellUpgradeDraftOption.cs

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+// Assets/_Project/Scripts/Gameplay/Draft/BuilderSpellUpgradeDraftOption.cs
+using UnityEngine;
+using TD.Core;
+using TD.Gameplay.BuilderSpells;
+
+namespace TD.Gameplay.Draft
+{
+    /// <summary>
+    /// Draft choice — "upgrade a builder spell you already have". Replaces
+    /// <see cref="BaseKind"/> with <see cref="UpgradedKind"/> in the player's
+    /// <see cref="PlayerSpellLoadout"/>, in place — the upgraded spell keeps the same hotkey
+    /// slot the base spell occupied.
+    /// </summary>
+    /// <remarks>
+    /// Mirrors <see cref="BuilderSpellDraftOption"/>, but swaps rather than adds (so it doesn't
+    /// consume a slot). Only offered while the player currently has <see cref="BaseKind"/>
+    /// granted — once taken, <see cref="BaseKind"/> is removed, which automatically makes this
+    /// option (and any sibling upgrade branching off the same base) invalid for future drafts.
+    /// </remarks>
+    [CreateAssetMenu(fileName = "BuilderSpellUpgradeOption",
+                      menuName = "TD/Draft/Builder Spell Upgrade Option")]
+    public class BuilderSpellUpgradeDraftOption : DraftOption
+    {
+        [Header("Payload")]
+        [Tooltip("The builder spell this option upgrades from.")]
+        public BuilderSpellKind BaseKind;
+
+        [Tooltip("The builder spell this option upgrades to.")]
+        public BuilderSpellKind UpgradedKind;
+
+        public override bool IsValidFor(ulong clientId)
+        {
+            var loadout = PlayerSpellLoadout.GetForClient(clientId);
+            return loadout != null && loadout.PlayerHasSpell(BaseKind);
+        }
+
+        public override bool ServerApply(ulong clientId)
+        {
+            var loadout = PlayerSpellLoadout.GetForClient(clientId);
+            return loadout != null && loadout.ServerUpgradeSpell(BaseKind, UpgradedKind);
+        }
+
+        /// <summary>Inherits the upgraded spell's icon (resolved from the pool by
+        /// <see cref="UpgradedKind"/>) unless this option assigns an override.</summary>
+        public override Sprite ResolveIcon()
+        {
+            if (Icon != null) return Icon;
+            var def = BuilderSpellPool.Instance != null ? BuilderSpellPool.Instance.Get(UpgradedKind) : null;
+            return def != null ? def.Icon : null;
+        }
+    }
+}

Assets/_Project/Scripts/Gameplay/Draft/TowerUpgradeDraftOption.cs

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+// Assets/_Project/Scripts/Gameplay/Draft/TowerUpgradeDraftOption.cs
+using UnityEngine;
+using TD.Towers;
+
+namespace TD.Gameplay.Draft
+{
+    /// <summary>
+    /// Draft choice — "upgrade a tower you already have". Replaces <see cref="BaseTower"/>
+    /// with <see cref="UpgradedTower"/> in the player's <see cref="PlayerTowerDeck"/>: every
+    /// tower of that type placed from now on is the upgraded version. Already-placed towers
+    /// are unaffected.
+    /// </summary>
+    /// <remarks>
+    /// Mirrors <see cref="NewTowerDraftOption"/>, but swaps rather than adds. Only offered
+    /// while the player currently has <see cref="BaseTower"/> unlocked — once taken,
+    /// <see cref="BaseTower"/> is removed from the deck, which automatically makes this option
+    /// (and any sibling upgrade branching off the same base) invalid for future drafts.
+    /// </remarks>
+    [CreateAssetMenu(fileName = "TowerUpgradeOption", menuName = "TD/Draft/Tower Upgrade Option")]
+    public class TowerUpgradeDraftOption : DraftOption
+    {
+        [Header("Payload")]
+        [Tooltip("The tower this option upgrades from. Must be present in the player's deck " +
+                 "for this option to be offered.")]
+        public TowerDefinition BaseTower;
+
+        [Tooltip("The tower this option upgrades to. Must also be present in the " +
+                 "TowerPlacementManager catalog (that's where its TowerTypeId comes from).")]
+        public TowerDefinition UpgradedTower;
+
+        public override bool IsValidFor(ulong clientId)
+        {
+            var deck = PlayerTowerDeck.GetForClient(clientId);
+            var pm   = TowerPlacementManager.Instance;
+            if (deck == null || pm == null || BaseTower == null || UpgradedTower == null) return false;
+
+            if (!pm.TryGetTypeId(BaseTower, out int baseTypeId)) return false;
+
+            return deck.Contains(baseTypeId);
+        }
+
+        public override bool ServerApply(ulong clientId)
+        {
+            var deck = PlayerTowerDeck.GetForClient(clientId);
+            var pm   = TowerPlacementManager.Instance;
+            if (deck == null || pm == null || BaseTower == null || UpgradedTower == null) return false;
+
+            if (!pm.TryGetTypeId(BaseTower, out int baseTypeId))
+            {
+                Debug.LogError($"[TowerUpgradeDraftOption] '{BaseTower.name}' is not in the tower " +
+                               $"catalog; cannot apply. Add it to TowerPlacementManager.towerDefinitions.");
+                return false;
+            }
+
+            if (!pm.TryGetTypeId(UpgradedTower, out int upgradedTypeId))
+            {
+                Debug.LogError($"[TowerUpgradeDraftOption] '{UpgradedTower.name}' is not in the " +
+                               $"tower catalog; cannot apply. Add it to " +
+                               $"TowerPlacementManager.towerDefinitions.");
+                return false;
+            }
+
+            return deck.ServerUpgradeTower(baseTypeId, upgradedTypeId);
+        }
+
+        /// <summary>Inherits the upgraded tower's icon unless this option assigns an override.</summary>
+        public override Sprite ResolveIcon()
+            => Icon != null ? Icon : (UpgradedTower != null ? UpgradedTower.Icon : null);
+    }
+}

Assets/_Project/Scripts/Gameplay/Draft/TowerUpgradeDraftOption.cs.meta

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+fileFormatVersion: 2
+guid: aeec22f152a57ef5798eae035c091543