[codex] Configure freebuff agents by model #530

Job	Run time
build-and-smoke-freebuff-windows	3m 12s
build-freebuff	1m 23s
e2e-slash-commands	56s
e2e-agent-startup	2m 29s
e2e-version	54s
e2e-ads-behavior	1m 2s
e2e-terminal-command	1m 12s
e2e-help-command	1m 25s
e2e-code-edit	1m 2s
e2e-startup	1m 0s
	14m 35s

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