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.

1 files changed, 12 insertions, 3 deletions

diff --git a/test/cli.t b/test/cli.t
index 610ce5b..ef1243e 100644
--- a/test/cli.t
+++ b/test/cli.t
@@ -621,18 +621,27 @@ An unknown extension with no --flavour is an error, not a silent fallback:
 
   $ printf 'x' > /tmp/t.wat
   $ colitur table --year 2027 --template /tmp/t.wat
-  colitur: cannot infer a flavour from ".wat"; pass --flavour latex|groff|html|xml|ics|none
+  colitur: cannot infer a flavour from ".wat"; pass --flavour latex|typst|groff|html|xml|ics|none
   [2]
 
   $ colitur table --year 2027 --template /tmp/t.wat --flavour none
   x
 
-An unrecognised --flavour value is also an error naming the six valid ones:
+An unrecognised --flavour value is also an error naming the seven valid ones:
 
   $ colitur table --year 2027 --template /tmp/t.txt --flavour bogus
-  colitur: unknown flavour "bogus" (want latex, groff, html, xml, ics or none)
+  colitur: unknown flavour "bogus" (want latex, typst, groff, html, xml, ics or none)
   [2]
 
+Typst is inferred from .typ, like every other flavour's own extension.
+Its metacharacters are escaped the same way latex's own is above -- here
+'-', verified live (against the real typst binary) to collapse into an
+en dash if left unescaped; a real shipped citation carries one:
+
+  $ printf '{{#days}}{{first}}\n{{/days}}' > /tmp/t.typ
+  $ colitur table --year 2027 --template /tmp/t.typ | grep -c '11\\-16'
+  1
+
 A malformed template is a clear error, not a crash:
 
   $ printf '{{#days}}oops' > /tmp/bad.txt