Add limited Freebuff DeepSeek access #674

Job	Run time
build-and-smoke-freebuff-windows	2m 40s
build-freebuff	1m 7s
e2e-help-command	1m 15s
e2e-version	1m 10s
e2e-startup	1m 0s
e2e-code-edit	1m 9s
e2e-terminal-command	50s
e2e-slash-commands	58s
e2e-ads-behavior	1m 21s
e2e-agent-startup	2m 20s
	13m 50s

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