fix(cli): close the flavour-list call sites Typst's addition exposed

The task this branch of work set out to test was whether the template
engine is genuinely flavour-agnostic outside lib/render/escape.ml. It
is not, quite: bin/main.ml's own --flavour error/help text and both
man pages hand-typed the flavour list and its count ("the six
flavours") as literal prose, so adding Typst as a seventh left three
places silently wrong (an incomplete flavour list in two error
messages, and "six" where the true count is now seven) until this
commit.

bin/main.ml's two error messages (unknown --flavour value, and cannot
infer a flavour from an extension) now build their flavour list by
walking Escape.all/to_string instead of a literal string, so the next
flavour added will not reintroduce the same drift; the static --help
body text and colitur(1)/colitur-templates(5) still name flavours and
their count by hand; there was no equivalent gain available for
prose formatted this specifically, so those were updated by hand
instead, along with colitur-templates(5)'s FLAVOURS section, which
gained typst's own subsection alongside latex/groff/html/xml/ics/none.

test/cli.t's two pinned error-text assertions are updated to match,
and gained a new case: .typ inferred from extension, and a real
shipped citation's hyphen surviving --flavour typst's own escaping
live, the same shape the 2035 Ss. Petri et Pauli case already proves
for latex's ampersand just above it.

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