Tighten opaque CLI auth tokens #6519

Job	Run time
build-and-check	3m 15s
test-integration-packages/internal	1m 6s
test-integration-packages/billing	1m 7s
test-integration-packages/agent-runtime	43s
test-integration-sdk	1m 17s
test-integration-web	42s
test-integration-common	44s
test-integration-cli	44s
test-packages/internal	56s
test-common	48s
test-packages/billing	46s
test-packages/agent-runtime	51s
test-cli	57s
test-sdk	43s
test-web	1m 15s
test-.agents	50s
	16m 44s

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