fix: clone response in middleware for Workers immutable headers

fix: replace _headers with Astro middleware for Workers compatibility

feat: Google Discovery signals, caching, schema enhancement, and image performance

fix: OG images — generate JPG 1200x630 for Facebook/social compatibility

fix: sitemap lastmod — use publishedAt directly for reliable dates

feat: add author pages with Person schema and internal linking

perf: self-host fonts, compress images, fix accessibility

fix: comprehensive SEO audit fixes — sitemap, OG, meta, schema

fix: compact editor's picks layout with 3 equal cards

fix: override wide card span in editor's picks grid context

fix: editor's picks grid layout — stack secondary cards vertically

feat: add legal/policy pages, json-ld schemas, and redesigned editor's picks

fix: balance homepage grid layout — no orphan cards

fix: sidebar layout overlap and FAQ in table of contents

fix: remove orphaned FAQ headings from article body content