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/jet.go

@@ -0,0 +1,33 @@
+package chart
+
+import "github.com/wcharczuk/go-chart/v2/drawing"
+
+// Jet is a color map provider based on matlab's jet color map.
+func Jet(v, vmin, vmax float64) drawing.Color {
+	c := drawing.Color{R: 0xff, G: 0xff, B: 0xff, A: 0xff} // white
+	var dv float64
+
+	if v < vmin {
+		v = vmin
+	}
+	if v > vmax {
+		v = vmax
+	}
+	dv = vmax - vmin
+
+	if v < (vmin + 0.25*dv) {
+		c.R = 0
+		c.G = drawing.ColorChannelFromFloat(4 * (v - vmin) / dv)
+	} else if v < (vmin + 0.5*dv) {
+		c.R = 0
+		c.B = drawing.ColorChannelFromFloat(1 + 4*(vmin+0.25*dv-v)/dv)
+	} else if v < (vmin + 0.75*dv) {
+		c.R = drawing.ColorChannelFromFloat(4 * (v - vmin - 0.5*dv) / dv)
+		c.B = 0
+	} else {
+		c.G = drawing.ColorChannelFromFloat(1 + 4*(vmin+0.75*dv-v)/dv)
+		c.B = 0
+	}
+
+	return c
+}