refactor: address 5-pass audit findings for antipatterns, bottlenecks, memory efficiency, and LLM handlers

server/src/handlers/ast.rs

@@ -59,6 +59,9 @@ impl McpTool for ReadFileSkeletonHandler {
             let mut result_skeleton = String::new();
 
             fn extract_skeleton(node: Node, code: &str, out: &mut String, depth: usize) {
+                if depth > 128 {
+                    return;
+                }
                 let kind = node.kind();
 
                 let is_structural = matches!(
@@ -106,7 +109,7 @@ impl McpTool for ReadFileSkeletonHandler {
                 } else if node.is_named() {
                     let mut cursor = node.walk();
                     for child in node.named_children(&mut cursor) {
-                        extract_skeleton(child, code, out, depth);
+                        extract_skeleton(child, code, out, depth + 1);
                     }
                 }
             }