OpenAI Agents Third-Party model providers #873

Job	Run time
build-lint-test (3.10, macos-intel)	11s
build-lint-test (3.13, macos-arm)	29s
build-lint-test (3.10, ubuntu-latest)	15s
build-lint-test (3.13, ubuntu-latest)	26s
build-lint-test (3.13, macos-intel)	10s
build-lint-test (3.10, macos-arm)	14s
build-lint-test (3.10, windows-latest)	22s
build-lint-test (3.13, windows-latest)	16s
	2m 23s

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