[codex] Grant signup credits #6449

Job	Run time
build-and-check	3m 1s
test-integration-packages/billing	1m 14s
test-integration-packages/agent-runtime	55s
test-integration-cli	48s
test-integration-web	47s
test-packages/billing	38s
test-packages/agent-runtime	47s
test-integration-sdk	1m 27s
test-packages/internal	48s
test-common	38s
test-integration-common	49s
test-.agents	39s
test-integration-packages/internal	59s
test-cli	53s
test-web	2m 28s
test-sdk	56s
	17m 47s

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