test(items): document refusal None invariant#3751
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This pull request documents why
ItemHelpers.extract_last_contentintentionally does not normalizeNonerefusal values. Supported provider paths only create refusal parts after receiving refusal text, while normal model validation rejectsNone; a focused test preserves this distinction from output-text handling and discourages parity changes based solely on syntheticmodel_constructobjects.ref: