{{/*
  include shortcode — inlines a reusable snippet from content/includes.

  Usage:
    {{% include "root-errors.md" %}}
    {{% include "compose/services.md" %}}

  The argument is a path relative to content/includes. The build fails with
  a clear message if the target does not exist, so a renamed or deleted
  snippet surfaces immediately instead of silently rendering nothing.
*/}}
{{ $fileToInclude := .Get 0 }}
{{ $filePath := printf "includes/%s" $fileToInclude }}
{{ if not (fileExists $filePath) }}
  {{- errorf "include shortcode: file %q not found: %s" $filePath .Position -}}
{{ end }}
{{ readFile $filePath | safeHTML }}