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/github.com/wcharczuk/go-chart/v2/matrix/vector.go

@@ -0,0 +1,17 @@
+package matrix
+
+// Vector is just an array of values.
+type Vector []float64
+
+// DotProduct returns the dot product of two vectors.
+func (v Vector) DotProduct(v2 Vector) (result float64, err error) {
+	if len(v) != len(v2) {
+		err = ErrDimensionMismatch
+		return
+	}
+
+	for i := 0; i < len(v); i++ {
+		result = result + (v[i] * v2[i])
+	}
+	return
+}