fix: Type fix and doc clarification

[kthota-g]

Description

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Release-As: 0.2.6

[gemini-code-assist]

Summary of Changes

Hello @kthota-g, 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 refining the A2A protocol's type definitions and enhancing its documentation. It addresses a specific type fix by making a configuration field optional and provides clearer guidance on the appropriate use of Task, Message, and Artifact objects within the protocol specification.

Highlights

• Type Definition Update: The acceptedOutputModes property within the MessageSendConfiguration interface in types/src/types.ts has been updated to be optional (acceptedOutputModes?: string[]). This change likely addresses a scenario where this field might not always be present.
• Documentation Clarification (Artifacts): Documentation in docs/specification.md and docs/topics/key-concepts.md has been updated to explicitly state that tasks in a completed state should use artifacts for returning generated output to clients. This clarifies the intended use of Artifact objects for task results.
• Documentation Clarification (Messages vs. Artifacts): The docs/topics/key-concepts.md file now more clearly distinguishes Messages from Artifacts, noting that messages convey information not necessarily formal Artifacts part of a Task.

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[gemini-code-assist]

Code Review

This pull request introduces a type fix by making acceptedOutputModes optional in MessageSendConfiguration and clarifies documentation regarding the use of Artifacts in completed Tasks.