Act as a technical SEO engineer. Add JSON-LD structured data across {{business_name}}'s site, a {{business_type}}, built with {{tech_stack}}. Main pages: {{key_pages}}. Before changing anything, list any structured data already on the site and check it for errors. Plan the types per page template: - Home: Organization, or the most specific LocalBusiness subtype, with name, logo, URL, contact details, address and opening hours if we have a location, and sameAs links to our real profiles; plus WebSite - Every inner page: BreadcrumbList matching the visible breadcrumbs - Blog posts: BlogPosting with headline, image, author as a Person with a profile page, and published and modified dates - Products or services: Product or Service with offers, price, currency and availability, only where they appear on the page - Events, courses, recipes or job posts only if we actually publish them Rules: - Mark up only what visitors can see on the page. Never add review stars, ratings or prices that aren't there - Build it from the same data that renders the page, so it can't drift, and output it in the server HTML - Link entities in one graph with stable IDs, so the Organization is defined once and referenced everywhere else - FAQPage only where a real FAQ is on the page, knowing it rarely earns rich results now - No invented aggregate ratings, and no reviews of our own business written by us Verify every template in Google's Rich Results Test and the Schema Markup Validator, and fix the errors and the warnings that matter. Finish with a table: template, types, key properties, data source and validator result. Then the files changed and anything I need to supply, such as our profile URLs.