fix normalize_xml_tags()

src/agent/context.rs

@@ -447,20 +447,18 @@ fn format_tool_call_xml(name: &str, args_json: &str) -> String {
 fn normalize_xml_tags(text: &str) -> String {
     let mut result = String::with_capacity(text.len());
     let mut chars = text.chars().peekable();
+    let mut in_tag = false;
+
     while let Some(ch) = chars.next() {
         if ch == '<' {
-            let mut tag = String::from('<');
-            for inner in chars.by_ref() {
-                if inner == '>' {
-                    tag.push('>');
-                    break;
-                } else if inner.is_whitespace() {
-                    // Skip whitespace inside tags
-                } else {
-                    tag.push(inner);
-                }
-            }
-            result.push_str(&tag);
+            in_tag = true;
+            result.push(ch);
+        } else if ch == '>' {
+            result.push(ch);
+            in_tag = false;
+        } else if in_tag && ch.is_whitespace() {
+            // Skip whitespace inside tags (between < and >)
+            continue;
         } else {
             result.push(ch);
         }