prune_unrelated -> refocus_tree

src/complexagent.rs

@@ -272,12 +272,13 @@ impl FutureMoves {
     fn update_root_idx(&mut self, idx: usize) {
         self.current_root = Some(idx);
         self.current_depth -= self.depth_of(idx) - 1;
-        self.prune_unrelated();
+        self.refocus_tree();
         self.extend_layers();
         self.compute_values(0..self.arena.len());
     }
 
-    fn prune_unrelated(&mut self) {
+    /// Rebuilds the Arena based on `self.current_root`, prunes unrelated nodes
+    fn refocus_tree(&mut self) {
         let Some(root) = self.current_root else {
             return;
         };