Fix: swap out reviewer agent in agent-builder examples #5470

Job	Run time
build-and-check	2m 24s
test-integration-cli	41s
test-integration-common	41s
test-integration-packages/internal	46s
test-web	44s
test-integration-packages/billing	47s
test-common	44s
test-cli	1m 10s
test-integration-packages/agent-runtime	40s
test-packages/agent-runtime	1m 0s
test-sdk	50s
test-packages/billing	45s
test-integration-.agents	45s
test-.agents	41s
test-integration-web	44s
test-packages/internal	46s
test-integration-sdk	40s
	14m 48s

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