- Update requirements.txt to make concrete-ml optional with clear comment
- Enhance FHE service warning message to include Python version info
- Remove concrete-ml from mandatory dependencies due to Python 3.13 incompatibility
- Maintain full functionality with TenSEAL provider as default
This resolves the 'Concrete ML not installed' warning by providing clear
information about the version compatibility issue while preserving all
FHE functionality through the TenSEAL provider.
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