[codex] Improve binary spawn errors #6717

Job	Run time
build-and-check	2m 49s
test-integration-packages/billing	1m 15s
test-integration-packages/internal	1m 11s
test-integration-common	40s
test-integration-sdk	1m 33s
test-integration-cli	46s
test-integration-web	45s
test-packages/internal	57s
test-integration-packages/agent-runtime	40s
test-common	48s
test-cli	53s
test-packages/billing	41s
test-web	58s
test-packages/agent-runtime	55s
test-.agents	46s
test-sdk	49s
	16m 26s

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