sdk: add promptAiSdkStructured to impl #4028

Job	Run time
build-and-check	2m 26s
test-integration-npm-app	33s
test-integration-backend	32s
test-integration-web	30s
test-integration-.agents	33s
test-backend	30s
test-.agents	31s
test-packages/agent-runtime	40s
test-integration-packages/agent-runtime	30s
test-integration-common	31s
test-common	31s
test-web	1m 25s
test-cli	30s
test-integration-cli	40s
test-npm-app	40s
	11m 2s

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