ciflow/torchtitan/196135: [dynamo] Refine diagnostic payload types after review

发生了什么

Keep the backend name string-typed, remove the one-use exception-args identity helper, and document the retained StopIteration value. Tighten the outer collection-formatting helpers and use the AOTInput hierarchy for tangent descriptors so the object annotations do not leave adjacent Any leaks. Test Plan: pyrefly check --baseline agent_space/compiler-exception-pyrefly-baseline.json torch/_dynamo/exc.py torch/_induct…

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