Update python samples to use a2a-python v1.0 #462
Description
Update Python Samples for a2a-python v1.0.0-alpha.0 Compatibility
Description
The a2a-python v1.0.0-alpha.0 release is now available and requires thorough validation across our implementations.
Updating the Python samples to be compatible with this version serves as verification step to ensure SDK stability and provide updated references for developers.