[codex] Use baseline Bun target for Windows builds #714

Job	Run time
build-and-smoke-freebuff-windows	3m 5s
build-freebuff	1m 22s
e2e-startup	1m 5s
e2e-slash-commands	56s
e2e-agent-startup	2m 24s
e2e-help-command	1m 15s
e2e-ads-behavior	1m 11s
e2e-terminal-command	54s
e2e-code-edit	1m 7s
e2e-version	54s
	14m 13s

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