Industry content demand for a site's vertical

"What your industry is asking" — trending topics across the site's vertical, demand-ranked and annotated with whether this organization already covers each one. The vertical-level companion to GET /cms/demand, which is per-site. Requires the read:analytics scope; the site must belong to the authenticated organization or the call is a 404. Cross-organization demand is k-anonymity gated by the same composer the in-app Insights card uses: only cleared, labelled, non-outlier cells are returned, and the payload deliberately carries no peer count, organization count or k value — just the topic label, a relative demand score, its trend, and the viewer's own coverage. When there is no vertical, no Answers data or no cleared cell, industry_demand is null (the same "card hidden" state the UI shows), never an error; an internal read fault degrades to null too.