feat(templates): ordo booklet and wall calendar in Typst

Adds templates/ef/ordo.typ (A5, one week per page, each day framed with
a colour swatch, real names, every fixed string through term.*) and
templates/ef/grid.typ (A4 landscape, one month per page, 7 columns,
colour-filled cells, Epistle/Gospel sigla), matching what ordo.tex and
grid.tex already do.

Typst resolves its own table of contents inside a single compile: no
pageref/aux-file dance, unlike pdflatex's own two-pass need for
ordo.tex. ordo.typ's TOC is one flat heading per week (Month . Week N)
rather than ordo.tex's own month-once/weeks-nested layout, since the
view model has no first-of-month flag for a template to test and
inventing one would be new engine state for a cosmetic grouping.
grid.typ deliberately diverges from grid.tex's own partial-fill
behaviour for a 5-week month: Typst's row-size list repeats its own
last entry for every remaining row, so a two-entry rows spec fills the
page completely regardless of week count, where LaTeX's fixed cellh
leaves a 5-week month's bottom sixth blank on purpose. Both divergences
are documented in the templates' own headers.

Two bugs found and fixed while building these against the real typst
0.14.2 binary: two stray hash characters in grid.typ's header comment
that were not actually inside a line-comment (would have been parsed
as Typst code, not prose); and two lines merging into one wherever they
were separated only by a bare newline (still the same soft-wrapped
paragraph in Typst, unlike LaTeX's own explicit paragraph break) --
fixed with a trailing backslash to force a real line break without
adding inter-paragraph spacing, verified against a full-year render
(zero typst warnings across all 365 days of 2027, in both templates).

Goldens (test/golden/ordo-2027.typ, test/golden/grid-2027.typ) were
generated through the harness's own View.of_days/Template.render_string
path, via a throwaway generator, NOT through the CLI: the CLI's default
language table differs from the harness's own English-chained-to-Latin
table, confirmed live (diffing CLI output against the harness's own
render showed exactly the expected language divergence and nothing
else) -- the same trap this project has hit before.

make check-templates now typesets both templates with the typst binary,
using the same SKIPPED-and-exit-0 shape the pdflatex/groff blocks
already use when their own tool is absent, verified in both directions:
absent (PATH without typst) skips loudly and exits 0, and a
deliberately corrupted template fails the target with a non-zero exit
and typst's own error text.

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