Major pipeline changes to map building, introducing 3player map, and adding Shared build mode to level authoring options

Assets/_Project/Scripts/Core/Enums.cs

@@ -203,6 +203,31 @@ namespace TD.Core
         Restricted = 2,
     }
 
+    /// <summary>
+    /// Whether a map restricts tower placement to each player's own zone, or lets everyone build
+    /// anywhere on the map's buildable area.
+    /// </summary>
+    /// <remarks>
+    /// <para>This governs placement PERMISSION only. Zone ownership keeps doing everything else it
+    /// does today under both modes — leak attribution, camera start position, builder spawn point,
+    /// minimap tinting. A shared-build map still has distinct player territories; they are simply
+    /// all buildable by everyone.</para>
+    ///
+    /// <para>Backed by byte with <c>OwnerOnly = 0</c> so <c>LevelData</c> assets baked before this
+    /// existed deserialize to the pre-existing behaviour without needing a re-bake.</para>
+    ///
+    /// <para>Tower OWNERSHIP is unaffected: a tower belongs to whoever paid for it, and sell /
+    /// upgrade stay owner-gated in both modes.</para>
+    /// </remarks>
+    public enum BuildAccess : byte
+    {
+        /// <summary>A player may only build on tiles covered by their own PlayerZoneVolume.</summary>
+        OwnerOnly = 0,
+
+        /// <summary>Any player may build on any Buildable tile, whichever zone owns it.</summary>
+        Shared = 1,
+    }
+
     /// <summary>
     /// Outcome of a bake operation, recorded on the baked <see cref="TD.Levels.LevelData"/> asset.
     /// </summary>