Yeast: Skip unnamed tokens in AST dump output

Unnamed tokens (keywords, operators, punctuation) in the unnamed
children bucket are no longer shown in dump output. They still appear
if they are inside a named field.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

shared/yeast/src/dump.rs

@@ -100,10 +100,14 @@ fn dump_node(ast: &Ast, id: usize, source: &str, options: &DumpOptions, indent:
         }
     }
 
-    // Unnamed children
+    // Unnamed children — skip unnamed tokens (keywords, punctuation)
     if let Some(children) = node.fields.get(&CHILD_FIELD) {
         for &child_id in children {
-            dump_node(ast, child_id, source, options, indent + 1, out);
+            if let Some(child) = ast.get_node(child_id) {
+                if child.is_named() {
+                    dump_node(ast, child_id, source, options, indent + 1, out);
+                }
+            }
         }
     }
 }