Tighten opaque CLI auth tokens #6520

Job	Run time
build-and-check	3m 9s
test-integration-packages/internal	1m 12s
test-integration-web	39s
test-integration-cli	44s
test-integration-packages/agent-runtime	49s
test-integration-common	48s
test-integration-sdk	1m 21s
test-integration-packages/billing	1m 0s
test-.agents	47s
test-cli	54s
test-web	1m 27s
test-common	40s
test-packages/internal	49s
test-sdk	53s
test-packages/agent-runtime	45s
test-packages/billing	49s
	16m 46s

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