refactor(cli): consolidate agent mode definitions into single source … #4904

Job	Run time
build-and-check	2m 43s
test-integration-backend	47s
test-integration-cli	58s
test-integration-.agents	1m 23s
test-integration-common	40s
test-integration-packages/internal	41s
test-integration-sdk	54s
test-integration-web	41s
test-integration-packages/billing	41s
test-packages/internal	51s
test-integration-packages/agent-runtime	37s
test-packages/billing	42s
test-backend	44s
test-integration-npm-app	57s
test-cli	1m 4s
test-web	45s
test-packages/agent-runtime	54s
test-.agents	39s
test-sdk	44s
test-common	41s
test-npm-app	46s
	18m 52s

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