test: fix role enum value in TCK SUT agent

[ishymko]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @ishymko, 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 addresses a consistency issue within the TCK SUT agent by standardizing the assignment of the role field. Instead of using a magic string, the change now leverages the Role enum, improving code clarity and reducing potential errors related to incorrect string values.

Highlights

• Enum Import: The Role enum was imported into tck/sut_agent.py to allow for proper enum usage.
• Role Enum Usage: The hardcoded string literal 'agent' for the role field in Message objects was replaced with the Role.ROLE_AGENT enum member, ensuring type safety and consistency.

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[gemini-code-assist]

Code Review

This pull request correctly replaces the hardcoded string 'agent' with the Role.ROLE_AGENT enum value when creating Message objects in the SUT agent. This is a good improvement for type safety and code clarity. The changes are correct and well-implemented.