index.md is both the man-page LANDING section and a Starlight content
page. Astro errors on any frontmatter key outside the fixed
man/site/manTitle/helpKeywords schema, so folding the source
fish-config.md pandoc header (title/section/header/date/author) onto
index.md under a fifth "pandoc" key would break the docs-site build
the moment it's scaffolded.
Relocate that block to docs/manual/_pandoc.yml: a plain, fence-free
YAML file that Astro content collections ignore (leading underscore).
split-manual.py now extracts it as raw text (no yaml.safe_load/
safe_dump round-trip) so build-manual.py's --concat re-emits it
byte-for-byte instead of merely "verbatim" in comment only. Also guard
build_concat against a manual/ tree with no _pandoc.yml/index.md,
removing the unconditional index.md parse that previously raised
FileNotFoundError on such a tree.
Regenerated docs/manual/ via split-manual.py; concat output remains
byte-identical to the pre-migration docs/fish-config.md.
rootiest
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