[codex] fix DeepSeek image attachments (#590) #483

Job	Run time
build-freebuff	1m 25s
build-and-smoke-freebuff-windows	3m 2s
e2e-version	1m 0s
e2e-startup	1m 6s
e2e-agent-startup	2m 19s
e2e-code-edit	52s
e2e-ads-behavior	1m 3s
e2e-terminal-command	1m 14s
e2e-slash-commands	1m 0s
e2e-help-command	1m 18s
	14m 19s

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