Add TODO.md tracking remaining Astro/Strapi rebuild work

TODO.md

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+# Astro + Strapi Rebuild — TODO
+
+Tracking doc for the `astro-migration` branch. See the locked spec in the
+approved plan for full rationale on each decision referenced below.
+
+## Done
+
+- [x] Scaffold pnpm workspace (`apps/site` Astro, `apps/cms` Strapi + SQLite)
+- [x] Switch tooling to pnpm-only, add Biome for lint/format
+- [x] Define shared `content/` schema (writings, portfolio, bookshelf, blogs)
+      with TOML frontmatter matching the legacy Zola format
+- [x] Bookshelf schema covers both books (ISBN) and papers (DOI/arXiv id)
+- [x] Custom Astro content loader parsing `+++` TOML frontmatter directly
+      (no YAML conversion step)
+- [x] Basic list/detail pages for all four content types, verified running
+      end-to-end in-browser (`pnpm --filter site dev`)
+- [x] CLAUDE.md updated: no agent self-attribution in commits/PRs, commit
+      regularly after each working step
+
+## Content pipeline
+
+- [ ] Strapi content-type definitions matching the `content/` schema exactly
+      (writings, portfolio, bookshelf, blogs)
+- [ ] Strapi custom provider/lifecycle hooks that read + write the same
+      Markdown files in `content/` (Strapi's DB stays a disposable cache)
+- [ ] Verify round-trip: edit in Strapi admin → file on disk updates, and
+      vice versa, without drift
+- [ ] Bookshelf ISBN lookup hook (Open Library / Google Books) with local
+      cover caching
+- [ ] Bookshelf paper lookup hook (Semantic Scholar / arXiv) with local
+      cover/thumbnail caching
+- [ ] OG image auto-generation extended from the legacy per-post script to
+      all three content types (writings, portfolio, bookshelf)
+- [ ] `llms.txt` generation extended to cover all content types, not just
+      posts
+
+## Design system
+
+- [ ] New typography scale + color system (full reset, not inherited from
+      `sass/_theme.scss`)
+- [ ] Motion primitives: CSS + native Web Animations API spring utility
+- [ ] Base layout/components replacing the placeholder `Base.astro`
+- [ ] Homepage redesign around the Three.js centerpiece as hero
+- [ ] New 404 page concept (terminal easter egg retired)
+
+## Three.js centerpiece
+
+- [ ] Decide the constellation/node-graph data model (what nodes/edges
+      represent — writings ↔ portfolio ↔ beliefs connections)
+- [ ] Build as an isolated Astro island
+- [ ] Static image/CSS fallback for `prefers-reduced-motion` and low-end
+      devices
+- [ ] Perf budget check on a low-end/mobile profile
+
+## Content features carried over from the Zola site
+
+- [ ] Series-nav (multi-part post series)
+- [ ] Table of contents (inline + sidebar)
+- [ ] Prev/next post navigation
+- [ ] Related posts (tag-based)
+- [ ] Per-tag descriptions on tag archive pages
+- [ ] `llms_description` meta (site-wide + per-post override — schema
+      already supports the override)
+- [ ] RSS/JSON feeds
+- [ ] Sitemap + robots.txt
+
+## Search & comments
+
+- [ ] Pagefind integration (static search index from the Astro build output)
+- [ ] Webmentions integration (replacing Utterances) — decide self-hosted
+      endpoint vs. webmention.io
+
+## Analytics
+
+- [ ] Stand up Plausible or Umami on the Dokploy host, wire up tracking
+      snippet (replacing Google Analytics)
+
+## Migration from the legacy Zola site
+
+- [ ] Script/process to convert `content/posts/*.md` into the new
+      `content/writings/` schema
+- [ ] Preserve slugs/URLs or add redirects (mechanism TBD — Astro
+      middleware vs. `static-web-server`/`sws.toml` rules)
+- [ ] Migrate `content/archive/`, `content/about.md` equivalents
+- [ ] Verify RSS subscribers and inbound links survive the cutover
+
+## Infra / deployment
+
+- [ ] Wire Strapi into the Dokploy deployment alongside the Astro build
+- [ ] Decide build trigger: webhook on Strapi publish → CI rebuild, vs.
+      manual/scheduled rebuild
+- [ ] Update `Dockerfile`/`sws.toml` for the new build output (currently
+      Zola-specific)
+
+## Cleanup
+
+- [ ] Remove Zola-specific files (`zola.toml`, `templates/`, `sass/`,
+      `themes/`, `content/posts/`, legacy OG/llms scripts) once each has a
+      working Astro/Strapi equivalent — progressively, not all at once