Update changelog, add AGENTS.md, remove CLAUDE.md

AGENTS.md

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+# AGENTS.md
+
+Project notes for coding agents working in this repo.
+
+## Commands
+
+- Install: `pnpm install`
+- Typecheck (acts as tests): `pnpm test`
+- Build: `pnpm build`
+- Dev: `pnpm dev`
+
+## Conventions
+
+- Use 2-space indentation.
+- Keep changes scoped: one logical change per commit.
+- Commit messages: concise, one line, sentence case. No emojis. No "Co-Authored-By".
+- Update `CHANGELOG.md` for user-visible changes (topmost entry).
+
+## Repo Layout
+
+- `src/App.tsx` is the main app shell.
+- `src/components/` holds UI components and modals.
+- `src/lib/` holds parsing + logic:
+  - `src/lib/epub.ts` for EPUB parsing and optional Open Library metadata.
+  - `src/lib/pdf.ts` for PDF text extraction.
+  - `src/lib/storage.ts` for localStorage + iOS/fullscreen helpers.
+  - `src/lib/reading.ts` for RSVP timing/ORP helpers.
+- `src/vendor/pdfjs/` vendors PDF.js ESM + worker for offline-friendly PDF parsing (see LICENSE in that folder).
+