[codex] Improve binary spawn errors (#724) #6718

Job	Run time
build-and-check	2m 53s
test-integration-packages/internal	1m 11s
test-integration-packages/billing	1m 17s
test-integration-packages/agent-runtime	45s
test-integration-web	40s
test-integration-cli	41s
test-integration-sdk	1m 25s
test-integration-common	41s
test-common	39s
test-packages/internal	52s
test-.agents	45s
test-packages/agent-runtime	55s
test-packages/billing	48s
test-sdk	41s
test-cli	52s
test-web	56s
	16m 1s

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