Tighten opaque CLI auth tokens (#628) #6521

Job	Run time
build-and-check	3m 0s
test-integration-packages/billing	1m 4s
test-integration-packages/internal	1m 7s
test-integration-common	52s
test-integration-web	48s
test-integration-sdk	1m 10s
test-integration-packages/agent-runtime	49s
test-integration-cli	39s
test-.agents	44s
test-packages/billing	47s
test-cli	50s
test-sdk	44s
test-common	51s
test-packages/internal	55s
test-packages/agent-runtime	49s
test-web	1m 14s
	16m 23s

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