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[Release] openai/openai-agents-python v0.15.0: v0.15.0

OpenAI Agents Python v0.15.0 introduces explicit model refusal handling through a new `ModelRefusalError` exception, replacing previous behavior where refusals were treated as empty output or caused retry loops. The release includes a `model_refusal` error handler that allows developers to gracefully handle refusals without raising exceptions. For structured-output agents, handlers can return values matching the output schema for validation. Additional updates include documentation improvements and dependency bumps.

• Model refusals are now surfaced explicitly as `ModelRefusalError` instead of empty text or retry loops
• Use `error_handlers={"model_refusal": lambda data: data.error.refusal}` to handle refusals without raising exceptions
• For structured-output agents, `model_refusal` handlers can return values matching the agent's output schema
• +4 more key points...