chore: scaffold website (Astro 6 + Starlight + Tailwind v4)

Phase A of docs/plans/20260604-adr-0042-website.md. Scaffolds the site
under website/ from the Starlight template; adds Tailwind v4 (via
@tailwindcss/vite) bridged to Starlight with @astrojs/starlight-tailwind
(src/styles/global.css + customCss). Production build is green: static
output, Pagefind search index, sharp image optimization.

Template placeholders (title, example pages, sidebar) are left for
Phase B/D. Reconciles the ADR/plan/index wording from "Astro 5" to
"Astro 6" to match the scaffolded toolchain.
This commit is contained in:
claude@clouddev1
2026-06-05 15:00:12 +00:00
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**Date:** 2026-06-04 · **Status:** ready to build
Decisions for this work are recorded in
[ADR-0042](../adr/0042-public-website-and-documentation-site.md): Astro 5 +
[ADR-0042](../adr/0042-public-website-and-documentation-site.md): Astro 6 +
Starlight + Tailwind v4; asciinema demos reusable in docs; the in-page WASM
playground deferred behind a stable demo seam; portable static hosting
(Vercel target); monorepo (`website/`); website is the canonical docs home;