feat: Implement Extended Authenticated Agent Card handling#178

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Copilot wants to merge 10 commits intomainfrom

Commits on Sep 4, 2025

Initial plan
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Implement Extended Authenticated Agent Card handling support

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Blackhex
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Add comprehensive documentation for Extended Authenticated Agent Cards

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Fix authenticated agent card endpoint per A2A specification

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Blackhex
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Implement agent/getAuthenticatedExtendedCard JSON-RPC method with shared implementation

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Blackhex
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Separate agent card handling from TaskManager per user feedback

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Blackhex
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Address all PR feedback comments

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Blackhex
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Revert AgentCardParams JsonSerializable attribute removal and restore class

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Blackhex
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Commits on Sep 5, 2025

Remove AgentCardParams class as agent/getAuthenticatedExtendedCard method requires no payload

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Blackhex
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Commits on Sep 8, 2025

Merge branch 'main' of https://github.com/a2aproject/a2a-dotnet into copilot/fix-46
brandonh-msft
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