chore: Fix Javadoc warnings in spec/ module

[kabir]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @kabir, 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 focuses on improving the documentation within the spec/ module by addressing and resolving Javadoc warnings. The changes primarily involve adding detailed Javadoc comments to interfaces, constants, record compact constructors, and builder methods, which enhances code clarity, maintainability, and adherence to documentation standards.

Highlights

• Javadoc for A2AMethods Interface: Comprehensive Javadoc comments have been added to the A2AMethods interface and all its constant fields, providing clear descriptions for each protocol method name.
• Enhanced Javadoc for Record Compact Constructors: Missing @param tags have been added to the Javadoc for compact constructors across numerous record classes, including APIKeySecurityScheme, DataPart, FilePart, HTTPAuthSecurityScheme, ListTaskPushNotificationConfigParams, Message, OAuth2SecurityScheme, OpenIdConnectSecurityScheme, Task, TaskArtifactUpdateEvent, TaskStatusUpdateEvent, and TextPart.
• Javadoc for Builder Methods: The builder(Message) and builder(Task) methods now include @return tags in their Javadoc, clarifying their return values.
• Package-Level Javadoc: A package-level Javadoc comment has been added to io.a2a.util, describing its purpose.

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[gemini-code-assist]

Code Review

This pull request does a good job of adding Javadoc comments to fix warnings across the spec module. The changes significantly improve the documentation and clarity of the code. The suggestions to further improve the Javadoc by including missing @throws tags for completeness, ensuring the documentation fully reflects the behavior of the constructors, are valid and align with the repository's guidelines.