[Bug]: Functions registered in a swarm may not be returning the correct SwarmResult

[marklysze]

Describe the bug

We need to investigate if functions that return SwarmResults in a swarm have the SwarmResult handled correctly. There may be an issue with serialisation of things like AfterWorkOption's that treats them as an agent name instead of the AfterWorkOption object.

We need to check that there's consistency with SwarmResult processing in swarm's _determine_next_speaker function when:

• A function is registered with an agent via the register_function method
• A function is registered with an agent via the register_for_llm decorator
• A function is registered with an agent via the functions argument on creation

Steps to reproduce

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Model Used

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Expected Behavior

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Screenshots and logs

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Additional Information

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