[codex] Coerce stringified spawn agent params #6595

Job	Run time
build-and-check	3m 11s
test-integration-packages/internal	1m 14s
test-integration-packages/billing	1m 16s
test-integration-sdk	1m 24s
test-integration-common	48s
test-integration-packages/agent-runtime	43s
test-integration-web	57s
test-web	56s
test-packages/agent-runtime	47s
test-packages/internal	57s
test-integration-cli	54s
test-packages/billing	43s
test-cli	50s
test-.agents	55s
test-common	53s
test-sdk	56s
	17m 24s

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