valknar 1037b84eaa Add KDP cover PDF generator ...

scripts/cover.js computes the exact cover canvas dimensions from the
page count in book-meta.json (written by build.js), using the KDP
Premium Color spine formula (0.002347 in/page), and renders a
Nunjucks template to a single PDF containing back cover, spine, and
front cover with bleed (0.125 in) and safe-zone overlay guides.

- `pnpm cover`  — generate output/cover.pdf
- `pnpm all`    — build interior + both PDFs in one command
- Cover artwork slots: images/cover/front.png, images/cover/back.png

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-03 17:29:10 +02:00

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