viable/strict/1790807359: [dynamo] Track attribute mutations on Tensor container outputs (#198514)

发生了什么

I reviewed the implementation and tests, including the exact Tensor-object identity safeguards and final test placement, and believe this is ready for maintainer review. AI-assisted summary: Tensor outputs inside tuple/list results were not registered for attribute-mutation replay, causing setattr on fresh outputs such as torch.split(...) to graph break. Track direct sourceless Tensor children only when their object…

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