{%- comment -%}
Canonical URL: set `canonical_url:` in a page's frontmatter to mark another
URL as the primary version. jekyll-seo-tag honors that natively and emits
only one . Used on thin overview pages whose
`/docs//reference/` companion is the substantive doc.
{%- endcomment -%}
{%- comment -%}
Markdown twin discovery: advertise the raw-markdown version of this page,
emitted by _plugins/llm_markdown.rb and served under content negotiation by
worker.js. The path scheme below MUST match that plugin's `twin_relpath` and
worker.js's `markdownTwin`. The home page ("/") has no twin.
{%- endcomment -%}
{%- assign _twin = "" -%}
{%- if page.url contains ".html" -%}
{%- assign _twin = page.url | replace: ".html", ".md" -%}
{%- else -%}
{%- assign _last = page.url | slice: -1 -%}
{%- if page.url != "/" and _last == "/" -%}
{%- assign _n = page.url.size | minus: 1 -%}
{%- assign _twin = page.url | slice: 0, _n | append: ".md" -%}
{%- endif -%}
{%- endif -%}
{%- if _twin != "" %}
{%- endif %}
{% include analytics.html %}