refactor: Update Task model fields to use protobuf types for statu…s, artifacts, and history.

[sokoliva]

This is a rollback of a change made in: #783

[gemini-code-assist]

Summary of Changes

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This pull request refactors the Task model by replacing generic type hints with specific protobuf-generated types for the status, artifacts, and history fields. This change improves type safety and consistency within the model, aligning it with defined protobuf structures. It also serves as a rollback, re-establishing the use of protobuf types after a previous alteration.

Highlights

• Model Refactoring: The Task model's status, artifacts, and history fields have been updated to utilize specific protobuf-generated types (TaskStatus, Artifact, Message) instead of generic dictionary or list-of-dictionary type hints.
• Type Safety: Introduced stronger type hinting for key fields in the TaskMixin to align with protobuf definitions, enhancing type safety and consistency across the application.
• Rollback Context: This change is a rollback of a previous modification, indicating a re-application or correction of the approach to integrate protobuf types.

Changelog

• src/a2a/server/models.py
  • Imported Artifact, Message, and TaskStatus from a2a.types.a2a_pb2.
  • Updated the type hints for TaskMixin.status to TaskStatus.
  • Updated the type hints for TaskMixin.artifacts to list[Artifact] | None.
  • Updated the type hints for TaskMixin.history to list[Message] | None.

Activity

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[gemini-code-assist]

Code Review

This pull request reverts a previous change, updating the Task model's status, artifacts, and history fields to use specific protobuf types instead of generic dictionaries. This improves type safety. My review identified a minor inconsistency in the type hint for the status field, which should be marked as optional to match the nullable database column. A code suggestion is provided to correct this.