fix:Add disallowTransferToParent check to parent agent transfer condition

[JinXingJX]

Only allow transfer to parent agent when both conditions are met:

• Parent agent exists (agent.parentAgent() != null)
• Transfer to parent is allowed (!agent.disallowTransferToParent())

This prevents unwanted transfers to parent agents when explicitly disabled. Aligns Java implementation with Python version for consistency.

[gemini-code-assist]

Summary of Changes

Hello @JinXingJX, 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 refines the agent transfer mechanism by introducing a new condition that prevents an agent from transferring to its parent if such a transfer is explicitly disallowed. This change ensures that transfers only occur when both a parent agent exists and the transfer is permitted, enhancing consistency and control over agent interactions.

Highlights

• Agent Transfer Logic Update: The condition for allowing an agent to transfer to its parent has been updated to include a check for !agent.disallowTransferToParent(). This prevents transfers to parent agents when they are explicitly disabled, aligning the Java implementation with its Python counterpart.

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[gemini-code-assist]

Code Review

This pull request adds a check for disallowTransferToParent when constructing the LLM prompt, ensuring that instructions to transfer to a parent agent are only provided when it's allowed. This change correctly aligns the prompt generation logic with the agent transfer target selection logic, preventing potentially confusing instructions for the LLM. I have added one comment pointing out a related, pre-existing issue in the prompt text that could be addressed to further improve clarity.

[JinXingJX]

Hi! This aligns Java with Python by preventing parent transfer when disallowTransferToParent is set. Could a maintainer please trigger CI and review?