Add Claude Code custom agents for extension design and Cloudflare LLM inference

Add session history dashboard, settings panel, and browser popup

Add quiz overlay UI with progress badge and question flow

Add blacklist and session store utilities

Add service worker for quiz orchestration and session persistence

Add content script for scroll tracking, article extraction, and text highlight

Configure Vite multi-entry build for Svelte extension

Add MV3 manifest and extension icons

Add quiz and session routes

Add Cloudflare Workers AI integration for quiz generation

Set up FastAPI backend with bearer token auth and Railway deployment config

Add .gitignore and Claude Code settings

Add product spec for Recall browser extension