The right way to surface policy and project knowledge inside SharePoint, if your sites are tidy.
Site-scoped Copilot agents that answer questions about the content of a specific SharePoint site or document library. Each site has a default agent, plus you can publish custom agents from Copilot Studio to that site.
Quality depends entirely on how well-organised the site is, and most are not. Setting it up well needs a SharePoint person. End users need a paid Copilot licence to use any custom site agent.
Custom agents require a Microsoft 365 Copilot licence (paid) for each user.