[codex] fix DeepSeek image attachments #482

Job	Run time
build-and-smoke-freebuff-windows	2m 27s
build-freebuff	1m 11s
e2e-version	53s
e2e-help-command	1m 18s
e2e-slash-commands	1m 0s
e2e-startup	1m 12s
e2e-code-edit	1m 1s
e2e-ads-behavior	1m 21s
e2e-terminal-command	59s
e2e-agent-startup	2m 28s
	13m 50s

Provide feedback