Integrate Pagefind for enhanced search functionality: update build process to include search indexing, add search page and UI components, and modify templates for search integration. Update styles for search modal and ensure proper indexing of chapter content. Enhance documentation to reflect new search capabilities.

.agents/skills/ofb/SKILL.md

@@ -33,8 +33,9 @@ frontend/                  → catalog-app, canvas viewer, site chrome
 ```bash
 bun install
 bun run build:js    # after frontend/ changes
+bun run index:search  # once per dev session (copies public/pagefind → static/pagefind)
 zola serve          # http://127.0.0.1:1111
-bun run build       # production: JS + Zola → public/
+bun run build       # production: JS + Zola + pagefind → public/
 ```
 
 ## Non-negotiables
@@ -59,6 +60,21 @@ bun run build       # production: JS + Zola → public/
 | New chapter (live) | Above + `content/{subject}/{slug}/_index.md` + HTML partial + `chapter.html` wiring + `main.tsx` widget mount if interactive |
 | Homepage subject card | `themes/.../templates/index.html` (not yet data-driven) |
 | Browse / nav URL | `zola.toml` `[extra] browse_url` + `base.html` site-config + `main.tsx` fallback |
+| Search UI / index | `base.html` (Pagefind assets + modal), `content/search.md`, `_search.scss`; `bun run index:search` for dev |
+
+## Search (Pagefind)
+
+| Piece | Path |
+|-------|------|
+| Global modal + assets | `themes/.../templates/base.html` |
+| Dedicated page | `/search/` — `content/search.md`, `templates/search.html` |
+| Header trigger | `frontend/src/components/site-header.tsx` (`pagefind-modal-trigger`) |
+| Nav link | `main.tsx` + `zola.toml` `search_url` |
+| Theming | `themes/.../sass/_search.scss` (`--pf-*` → site tokens) |
+
+- **Component UI** only (`pagefind-component-ui.js`), not legacy `pagefind-ui.js`.
+- Index runs **after** `zola build`. Production: `bun run build`. Dev: `bun run index:search` copies bundle to `static/pagefind/` (gitignored) for `zola serve`.
+- v1 indexes **live chapter pages only** (`data-pagefind-body` on `templates/math/chapter.html`); home, about, catalog, credits, and other site pages are excluded.
 
 Detailed checklists: [curriculum-data.md](curriculum-data.md). Human-facing guide: [CONTRIBUTING.md](../../../CONTRIBUTING.md).
 
@@ -114,7 +130,6 @@ bun run build
 
 ## Planned / not implemented (do not assume)
 
-- Pagefind search (`build_search_index = false`)
 - Defuddle “copy as Markdown” on chapters
 - Markdown-based chapters (spec says HTML; README may be outdated)
 - Data-driven homepage cards