feat: Prevent placing entities on water and improve land generation

utils.js

@@ -90,6 +90,14 @@ function knockback(ent, tx, ty, dist) {
   }
 }
 
+/**********************************************************************
+ * PLACEMENT VALIDATION
+ **********************************************************************/
+// Check if a position is valid for placement (not in water)
+function isValidPlacement(x, y) {
+  return !isWater(x, y);
+}
+
 /**********************************************************************
  * FINDERS
  **********************************************************************/