* Document flow agent options
Document and type inline Flow agent options so authored flows can set:
* `llm.model`, `llm.max_tokens`, and `llm.max_completion_tokens`
* `planning_config.max_attempts`
* `allow_delegation`
* `max_iter`
* `max_rpm`
* `max_execution_time` in seconds
Also tell the flow skill to omit optional fields unless needed.
* Potential fix for pull request finding 'Unused import'
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