Fixed: resolve clippy lints in serdesai tests

- Merge split doc comment on OverridingRunHook (empty line after doc)
- Block-scope captured-settings MutexGuards so no guard lexically spans
  an await (clippy::await_holding_lock)
- Pass predicate directly to Iterator::position (redundant closure)
- Use next_back instead of last on a DoubleEndedIterator
- Use an array for the fixed expected-transcript fixture (useless vec)

Author: Sewer56

src/reloaded-code-serdesai/src/agent_runtime/stream_events.rs

@@ -653,7 +653,7 @@ mod tests {
 
         let messages = distill_messages(vec![request, follow_up]);
 
-        let expected = vec![
+        let expected = [
             RunMessage {
                 role: RunMessageRole::System,
                 text: Some("sys".into()),
@@ -1007,7 +1007,7 @@ mod tests {
 
     /// Index of the first event matching `predicate`.
     fn position(events: &[RunEvent], predicate: &dyn Fn(&RunEvent) -> bool) -> Option<usize> {
-        events.iter().position(|event| predicate(event))
+        events.iter().position(predicate)
     }
 
     #[tokio::test]
@@ -1120,7 +1120,7 @@ mod tests {
             .iter()
             .filter(|message| message.role == RunMessageRole::Assistant)
             .filter_map(|message| message.text.as_deref())
-            .last()
+            .next_back()
             .expect("closing assistant turn should carry text");
         assert_eq!(final_answer, streamed_answer);
     }

src/reloaded-code-serdesai/src/agent_runtime/task.rs

@@ -1076,7 +1076,7 @@ mod tests {
 
     /// Model settings overrides: applied per run, merged over the agent's
     /// configured settings, with prompt-prepend behavior untouched.
-
+    ///
     /// Run hook that installs fixed model settings overrides before
     /// delegating to `original`.
     struct OverridingRunHook {
@@ -1188,17 +1188,18 @@ mod tests {
 
         hooked.run("hello", ()).await.expect("run should complete");
 
-        let seen = captured
-            .lock()
-            .expect("captured settings should not be poisoned");
-        assert_eq!(seen.len(), 1, "one model request should have been made");
-        assert_eq!(seen[0].temperature, Some(f64::from(0.9_f32)));
-        assert_eq!(
-            seen[0].top_p,
-            Some(f64::from(0.8_f32)),
-            "agent-configured top_p should be retained"
-        );
-        drop(seen);
+        {
+            let seen = captured
+                .lock()
+                .expect("captured settings should not be poisoned");
+            assert_eq!(seen.len(), 1, "one model request should have been made");
+            assert_eq!(seen[0].temperature, Some(f64::from(0.9_f32)));
+            assert_eq!(
+                seen[0].top_p,
+                Some(f64::from(0.8_f32)),
+                "agent-configured top_p should be retained"
+            );
+        }
 
         // Mirror direction: a top_p-only override replaces top_p and keeps
         // the agent-configured temperature.
@@ -1209,16 +1210,18 @@ mod tests {
 
         hooked.run("hello", ()).await.expect("run should complete");
 
-        let seen = captured
-            .lock()
-            .expect("captured settings should not be poisoned");
-        assert_eq!(seen.len(), 1, "one model request should have been made");
-        assert_eq!(seen[0].top_p, Some(f64::from(0.6_f32)));
-        assert_eq!(
-            seen[0].temperature,
-            Some(f64::from(0.3_f32)),
-            "agent-configured temperature should be retained"
-        );
+        {
+            let seen = captured
+                .lock()
+                .expect("captured settings should not be poisoned");
+            assert_eq!(seen.len(), 1, "one model request should have been made");
+            assert_eq!(seen[0].top_p, Some(f64::from(0.6_f32)));
+            assert_eq!(
+                seen[0].temperature,
+                Some(f64::from(0.3_f32)),
+                "agent-configured temperature should be retained"
+            );
+        }
     }
 
     #[tokio::test]