fix: change AgentCard's Security prop type to comply a2a spec

[bhakimiy]

Fixes #151

[gemini-code-assist]

Summary of Changes

Hello @bhakimiy, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the AgentCard model to align its Security property with the A2A specification. The change involves modifying the data type of the Security property from a dictionary to a list of dictionaries, which is a crucial step for ensuring data compatibility and correct interpretation of security requirements as per the specification. Accompanying unit tests have been updated to reflect this structural change, ensuring that serialization and deserialization of AgentCard objects continue to function as expected with the new type definition.

Highlights

• Model Type Change: The Security property within the AgentCard model has been updated from a Dictionary<string, string[]>? to a List<Dictionary<string, string[]>>?. This change ensures compliance with the A2A specification, which likely mandates the security field to be an array of security schemes rather than a single object.
• Unit Test Updates: Corresponding unit tests in AgentCardTests.cs have been modified to reflect the new Security property type. This includes updating the JSON payload used for deserialization, adjusting the way the Security property is initialized for serialization, and modifying assertions to correctly validate the structure of the Security list.

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[gemini-code-assist]

Code Review

This pull request correctly updates the Security property in AgentCard to a List<Dictionary<string, string[]>>? to comply with the A2A specification. The changes are consistently applied across the model and its unit tests, including test data and assertions. The implementation is solid, and I have one minor suggestion to improve test code readability.

[Blackhex]

LGTM (I agree with the Gemini comment).