[codex] Grant signup credits #6451

Job	Run time
build-and-check	3m 2s
test-integration-packages/billing	1m 13s
test-integration-packages/internal	1m 9s
test-integration-common	47s
test-integration-packages/agent-runtime	40s
test-integration-sdk	1m 26s
test-integration-web	41s
test-sdk	53s
test-packages/billing	42s
test-packages/internal	52s
test-web	1m 10s
test-packages/agent-runtime	48s
test-cli	55s
test-common	44s
test-integration-cli	45s
test-.agents	46s
	16m 33s

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