fix(streaming): drop raw tool args from WARNING log

Logging raw_args[:200] could leak partial file contents, PII, or
secrets from write_file / apply_patch arguments into production log
pipelines. Switch to logging only bounded metadata (tool name + raw
arg byte count).

The existing malformed-args test still passes since it asserts on the
"Failed to parse tool call arguments" prefix, which is preserved.

Author: vkalmathscale

src/agentex/lib/core/temporal/plugins/openai_agents/models/temporal_streaming_model.py

@@ -874,7 +874,8 @@ async def get_response(
                                         parsed_args = json.loads(raw_args) if raw_args else {}
                                     except json.JSONDecodeError:
                                         logger.warning(
-                                            f"Failed to parse tool call arguments for {call_data['name']}: {raw_args[:200]}"
+                                            f"Failed to parse tool call arguments for {call_data['name']} "
+                                            f"(raw_args_bytes={len(raw_args)})"
                                         )
                                         parsed_args = {}
                                     try: