v1.5.0

Added

• GEO / LLMO / AEO working definitions and evidence-level classification.
• Eight-stage Generative Visibility audit with six-field findings, entity clarity,
  original information gain, and citation-ready editorial checks.
• AI referral, citation/mention rate, source prominence and repeated benchmark methodology.

Changed

• Expanded the existing AI Search reference and discovery triggers in EN/JP; no new skill or dependency.
• Classified training, search and user retrieval separately; clarified mixed-purpose
  Google-Extended and blocking limitations, and optional experimental llms.txt guidance.
• Synchronized documentation, research provenance and distribution versions at 1.5.0.
• Verified the changed AI search material on 2026-09-07; untouched references retain their dates.
• Refreshed last_verified on astro-seo.md and edge-seo.md (EN/JP) to 2026-09-02; verified
  against Astro 7.2.10 and @astrojs/sitemap 3.7.4.

Fixed

• edge-seo.md (EN/JP) — documented the navigation-request rule
  (assets_navigation_prefers_asset_serving, default since compatibility date 2025-04-01): with a
  Worker script and not_found_handling set, browser navigations that miss a static asset are
  served 404.html / index.html without invoking the Worker, while crawlers still reach it. The
  reference wrangler.jsonc in this file exhibited the bug for SSR routes outside
  run_worker_first. Added the three mitigations and a browser-vs-curl check.
• astro-seo.md (EN/JP) — noted the Astro 7.2.0 Astro.url.pathname fix for
  build.format: 'preserve' and the @astrojs/sitemap 3.7.3 (per-child lastmod in the index)
  and 3.7.4 (homepage empty-path URL) fixes.