[codex] Coerce stringified spawn agent params (#658) #6596

Job	Run time
build-and-check	3m 1s
test-integration-packages/billing	1m 3s
test-integration-packages/internal	1m 2s
test-packages/billing	40s
test-integration-web	41s
test-integration-packages/agent-runtime	40s
test-.agents	43s
test-integration-cli	57s
test-integration-sdk	1m 21s
test-cli	52s
test-integration-common	44s
test-sdk	52s
test-common	46s
test-packages/agent-runtime	49s
test-web	47s
test-packages/internal	56s
	15m 54s

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