Restore managed Gradio runtime after attestation experiment

#6

Restore the exact original app.py and README from f6ef7f2 and remove only the unused attestation helper/tests added in this wave. Managed Gradio does not expose the exact well-known route safely; document that limitation externally rather than changing SDK behavior.

Merged to preserve the proven managed Gradio runtime contract; source-attestation limitation will be recorded honestly.

betterwithage changed pull request status to merged

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