“Lights buying heat” fact lives on Light instead of Climate -> Efficacy where it belongs

Re-checked the actual code (LightPage.tsx): the chip already has onClick={() => navigate(‘/live/climate’)} — it functions as a link-out, not an independent duplicate control. The redundancy is only that it also displays the value inline, which is low-risk (informational, not editable). No code change made; downgrading from open finding since the doc’s concern (a duplicate control diverging from Climate) doesn’t actually apply here.