feat(templates): ordo booklet in six flavours, pinned by goldens

LaTeX and groff are the print paths; HTML carries a print stylesheet;
AsciiDoc, Markdown and plain text are the plain-consumer paths.

AsciiDoc and Markdown use flavour none, and say so in a comment: their
metacharacters are context-dependent and escaping them aggressively
produces worse output than not escaping. The consequence is real and
documented -- a feast name containing * renders as emphasis.

Golden tests pin all six byte-for-byte for 2027. They prove the
templates RENDER, not that they TYPESET; compiling needs TeX and groff,
which is Task 13's opt-in make check-templates.

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