[xiehuanyi]

RetryHandler.execute() accepts callable objects, but a failure in a functools.partial or an instance with __call__ raises AttributeError from the retry log's func.__name__ lookup. That prevents a transient failure from being retried and replaces the original exception when retries are disabled.

Use the callable's name when available, otherwise its type name, for retry diagnostics. Retry decisions and operation arguments are unchanged.

Validation: all three new regressions fail on main; they now prove retry success for partials and callable instances and preservation of the original terminal error. All 211 offline tests pass (1 credential-dependent skip, 30 integration tests deselected), plus full Ruff and Black. Mypy reports the same 57 base diagnostics and is advisory in repository CI. No provider service was contacted.

AI assistance: implemented and tested with Codex.

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