[codex] Grant signup credits #521

Job	Run time
build-and-smoke-freebuff-windows	2m 30s
build-freebuff	1m 24s
e2e-startup	1m 0s
e2e-code-edit	56s
e2e-help-command	1m 23s
e2e-terminal-command	1m 3s
e2e-agent-startup	2m 25s
e2e-ads-behavior	1m 14s
e2e-version	52s
e2e-slash-commands	1m 11s
	13m 58s

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