fix: wrap long docstring line in tracker.py

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jsonbailey

packages/sdk/server-ai/src/ldai/tracker.py

@@ -121,7 +121,8 @@ def track_duration(self, duration: int, *, graph_key: Optional[str] = None) -> N
         Manually track the duration of an AI operation.
 
         :param duration: Duration in milliseconds.
-        :param graph_key: When set, include ``graphKey`` in the event payload (e.g. config-level metrics inside a graph).
+        :param graph_key: When set, include ``graphKey`` in the event payload
+            (e.g. config-level metrics inside a graph).
         """
         self._summary._duration = duration
         self._ld_client.track(