[codex] fix DeepSeek image attachments #6409

Job	Run time
build-and-check	2m 51s
test-integration-packages/billing	1m 16s
test-integration-packages/internal	1m 6s
test-integration-sdk	1m 18s
test-integration-web	47s
test-integration-common	39s
test-integration-cli	40s
test-integration-packages/agent-runtime	48s
test-.agents	44s
test-packages/internal	53s
test-common	47s
test-web	2m 18s
test-cli	1m 4s
test-packages/billing	51s
test-packages/agent-runtime	53s
test-sdk	42s
	17m 37s

Provide feedback