[ez] Expose FOLDED_FROM_KEY to onnxscript.optimizer public API (#2773) The `FOLDED_FROM_KEY` constant was previously only accessible from the private `_constant_folding` module, making it difficult for users to interact with constant folding metadata. ## Changes - Exported `FOLDED_FROM_KEY` in `onnxscript/optimizer/__init__.py` by adding it to `__all__` and importing from `_constant_folding` - Added test coverage to ensure the constant remains publicly accessible ## Usage ```python from onnxscript.optimizer import FOLDED_FROM_KEY # Use the key to access metadata about folded constants folded_values = output.meta.get(FOLDED_FROM_KEY, set()) ``` The constant value is `"pkg.onnxscript.optimizer.folded_from"`, used to track which values were folded during constant folding optimization.

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> > ---- > > *This section details on the original issue you should resolve* > > Expose FOLDED_FROM_KEY to public > Expose FOLDED_FROM_KEY to onnxscript.optimizer for public consumption. > > ## Comments on the Issue (you are @copilot in this section) > > > >

- Fixes microsoft/onnxscript#2772 --- 💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more [Copilot coding agent tips](https://gh.io/copilot-coding-agent-tips) in the docs. --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: justinchuby <11205048+justinchuby@users.noreply.github.com>

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Expose FOLDED_FROM_KEY to public #2772

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