[codex] fix DeepSeek image attachments (#590) #6411

Job	Run time
build-and-check	3m 18s
test-integration-packages/internal	1m 14s
test-integration-packages/billing	1m 14s
test-integration-packages/agent-runtime	43s
test-integration-web	44s
test-integration-sdk	1m 29s
test-integration-cli	45s
test-integration-common	40s
test-packages/internal	52s
test-cli	1m 1s
test-packages/agent-runtime	40s
test-.agents	52s
test-sdk	45s
test-packages/billing	52s
test-common	38s
test-web	1m 15s
	17m 2s

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