Fix: tell code reviewer its a subagent. Drop "opus" from code reviewe… #5105

Job	Run time
build-and-check	2m 30s
test-.agents	38s
test-integration-packages/billing	38s
test-integration-cli	42s
test-integration-sdk	54s
test-integration-.agents	1m 11s
test-backend	41s
test-integration-backend	45s
test-integration-packages/internal	41s
test-sdk	47s
test-packages/billing	38s
test-npm-app	44s
test-integration-npm-app	46s
test-integration-web	38s
test-integration-common	40s
test-integration-packages/agent-runtime	37s
test-packages/internal	50s
test-cli	1m 10s
test-web	41s
test-packages/agent-runtime	50s
test-common	39s
	17m 40s

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