agent2: Port Zed AI features (#36172)

Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>

crates/language_model/src/model/cloud_model.rs

@@ -42,6 +42,18 @@ impl fmt::Display for ModelRequestLimitReachedError {
     }
 }
 
+#[derive(Error, Debug)]
+pub struct ToolUseLimitReachedError;
+
+impl fmt::Display for ToolUseLimitReachedError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "Consecutive tool use limit reached. Enable Burn Mode for unlimited tool use."
+        )
+    }
+}
+
 #[derive(Clone, Default)]
 pub struct LlmApiToken(Arc<RwLock<Option<String>>>);