docs(agent): keep the comment next to the line it explains

Final-gate quality nit: the comment was stale or sat away from its line.

agent/codex_runtime.py

@@ -1113,7 +1113,6 @@ def run_codex_stream(agent, api_kwargs: dict, client: Any = None, on_first_delta
         # Claim the delta sink for THIS attempt; a newer attempt supersedes this token.
         writer_token["value"] = claim_stream_writer(agent)
         writer_token["raw_stream"] = _raw_stream
-        # No time.time() here: the first-event stamp below is the attempt's timeline anchor.
         logger.debug("Codex stream opened (attempt=%s/%s, model=%s)",
             attempt + 1, max_stream_retries + 1, model)