Is your feature request related to a problem? Please describe.

Currently Agent Card does not have a unique identifier attribute for an agent. agent_card.name is not guaranteed unique and is prone to branding changes.

Describe the solution you'd like

• Add a newid attribute to the agent card which must be a randomly generated UUID.
• This id must remain same for all versions of an agent.
• Mark the id as optional for backward compatibility.
• Clients can reliably use id as the identifier if set in the agent card.

Describe alternatives you've considered

No response

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct