[codex] fix DeepSeek image attachments #6410

Job	Run time
build-and-check	3m 0s
test-integration-packages/billing	1m 12s
test-integration-packages/internal	1m 8s
test-integration-web	50s
test-integration-cli	46s
test-integration-sdk	1m 16s
test-integration-packages/agent-runtime	39s
test-integration-common	51s
test-packages/billing	59s
test-packages/internal	52s
test-cli	54s
test-.agents	51s
test-packages/agent-runtime	45s
test-sdk	46s
test-common	41s
test-web	1m 16s
	16m 46s

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