Fix Pages build failure by making sitemap.xml Liquid filters Jekyll-3 compatible

[Copilot]

GitHub Pages build was failing in actions/jekyll-build-pages@v1 with a Liquid parse error in docs/sitemap.xml (Expected end_of_string but found id). The failure came from a compound where_exp condition that is not accepted by the GitHub Pages Jekyll/Liquid runtime.

• Root cause

  • docs/sitemap.xml used a single where_exp with an and expression:
    • page.layout == 'default' and page.sitemap != false
  • Under the Pages runtime (Jekyll 3.10 / Liquid 4), this expression is rejected during sitemap rendering.

• Change made

  • Split filtering into two supported steps:
    1. where for layout == "default"
    2. where_exp for page.sitemap != false
  • This preserves sitemap inclusion logic while using syntax accepted by Pages.

• Snippet

  {% assign seo_pages = site.pages
    | where: "layout", "default"
    | where_exp: "page", "page.sitemap != false" %}