Adding HUD!

Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs

@@ -594,6 +594,22 @@ namespace TD.Gameplay
             return TryGetDefinition(typeId, out var def) ? def : null;
         }
 
+        /// <summary>
+        /// Enumerates all valid (definition, typeId) pairs from the current definition list.
+        /// TypeId 0 is reserved; valid entries start at index 1. Used by the HUD command grid
+        /// to populate tower buttons. Only meaningful on the instance — check Instance != null
+        /// before calling.
+        /// </summary>
+        public System.Collections.Generic.IEnumerable<(TowerDefinition def, int typeId)>
+            GetAvailableDefinitions()
+        {
+            for (int i = 1; i < towerDefinitions.Length; i++)
+            {
+                if (towerDefinitions[i] != null)
+                    yield return (towerDefinitions[i], i);
+            }
+        }
+
         /// <summary>
         /// Maps a client ID to the PlayerSlot assigned to that client.
         /// </summary>