Add opus agent #5540

Job	Run time
build-and-check	2m 32s
test-integration-packages/billing	1m 16s
test-integration-packages/agent-runtime	39s
test-integration-common	46s
test-integration-packages/internal	1m 1s
test-integration-web	46s
test-packages/internal	51s
test-integration-sdk	38s
test-integration-cli	37s
test-.agents	41s
test-cli	1m 6s
test-web	50s
test-sdk	48s
test-packages/agent-runtime	54s
test-packages/billing	38s
test-common	45s
	14m 48s

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