mopac-pdf v0: markdown to beautiful PDFs via digest-pinned typst

Go CLI that turns the markdown currency of this stack (Redmine notes,
Discourse posts, briefing output) into typeset PDFs: two embedded typst
templates (report with title page/TOC/headers, dense brief), front-matter
(title/subtitle/author/date/classification/template), GFM tables, and
bar charts rendered in pure Go (go-chart) from fenced chart data blocks.
Engine is a prebuilt typst 0.15.1 container pinned by digest and run
--network none; PDF bytes to stdout or -o. Exit codes 0/1/2.

All dev in docker (dev.sh/Makefile); unit tests + golden typst fixtures
plus a host-side smoke against the real engine container.

Generated with Crush

Assisted-by: Crush:glm-5.2

vendor/modules.txt

@@ -0,0 +1,16 @@
+# github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+## explicit
+github.com/golang/freetype/raster
+github.com/golang/freetype/truetype
+# github.com/wcharczuk/go-chart/v2 v2.1.2
+## explicit; go 1.15
+github.com/wcharczuk/go-chart/v2
+github.com/wcharczuk/go-chart/v2/drawing
+github.com/wcharczuk/go-chart/v2/matrix
+github.com/wcharczuk/go-chart/v2/roboto
+# golang.org/x/image v0.18.0
+## explicit; go 1.18
+golang.org/x/image/draw
+golang.org/x/image/font
+golang.org/x/image/math/f64
+golang.org/x/image/math/fixed