[codex] Block Freebuff VPN and proxy traffic #756

Job	Run time
build-and-smoke-freebuff-windows	2m 51s
build-freebuff	1m 30s
e2e-version	1m 16s
e2e-slash-commands	1m 10s
e2e-ads-behavior	1m 33s
e2e-startup	1m 24s
e2e-help-command	1m 29s
e2e-code-edit	1m 37s
e2e-agent-startup	2m 38s
e2e-terminal-command	1m 19s
	16m 47s

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