Update neuron-core/a2a to the latest A2A protocol version (v1.0.0)

[aleks-life]

Hello @ilvalerione , thank you for adding A2A support to Neuron Core. We were wondering if you have any plans to update the codebase to the latest A2A protocol version, specifically v1.0.0?

[ilvalerione]

Are you working on a use case? Can you give us some context?