Port to Pydantic-AI #381

Job	Run time
Test ubuntu-latest Python 3.9	3m 18s
Test ubuntu-latest Python 3.10	1m 8s
Test ubuntu-latest Python 3.11	51s
Test ubuntu-latest Python 3.12	1m 12s
Test macos-latest-xlarge Python 3.11	1m 27s
Test macos-latest-xlarge Python 3.12	1m 29s
Test macos-13 Python 3.9	5m 28s
Test macos-13 Python 3.10	2m 35s
Test macos-13 Python 3.11	2m 22s
Test macos-13 Python 3.12	2m 1s
Test windows-latest Python 3.9	5m 34s
Test windows-latest Python 3.10	3m 15s
Test windows-latest Python 3.11	3m 15s
Test windows-latest Python 3.12	3m 43s
	37m 38s

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