核心 : “ 最终化 工具 call chunk ” 强制“ id=无” 到“ “ ” , 崩溃平行的 id- 无工具调用

`langchain_core.language_models._compat_bridge.finalize_tool_call_chunk` coerces `id_=None` to `ToolCall.id=""` (and `ServerToolCall.id=""`). This normalization is applied on every path that goes through the compat bridge —