Port from pydantic-ai to openai-agents SDK #390

Job	Run time
Test ubuntu-latest Python 3.12	1m 9s
Test macos-13 Python 3.11	2m 2s
Test macos-latest-xlarge Python 3.12	1m 30s
Test ubuntu-latest Python 3.9	3m 47s
Test macos-13 Python 3.9	5m 37s
Test ubuntu-latest Python 3.10	1m 28s
Test macos-latest-xlarge Python 3.11	1m 30s
Test macos-13 Python 3.10	2m 23s
Test macos-13 Python 3.12	3m 11s
Test windows-latest Python 3.10	3m 52s
Test windows-latest Python 3.11	3m 55s
Test windows-latest Python 3.12	4m 6s
Test ubuntu-latest Python 3.11	1m 15s
Test windows-latest Python 3.9	6m 34s
	42m 19s

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