chore: create AGENTS.md

AGENTS.md

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+# Campfire - Hack Club Game Jam Website
+
+## Commands
+- **Development**: `npm run dev` (start development server)
+- **Build**: `npm run build` (TypeScript compile + Vite build)  
+- **Lint**: `npm run lint` (ESLint check)
+- **Preview**: `npm run preview` (preview production build)
+- **Working directory**: Always use `/Users/asc/code/campfire/frontend` as cwd for npm commands
+
+## Architecture
+- **Tech Stack**: React 19 + TypeScript + Vite + TailwindCSS 4
+- **Single Frontend Application**: No backend - purely client-side React app
+- **Structure**: `/frontend` contains entire application
+- **Build Tool**: Vite with React plugin and TailwindCSS integration
+- **Styling**: TailwindCSS 4 with custom fonts (Amatic SC, DREAM PLANNER)
+
+## Code Style Guidelines
+- **TypeScript**: Strict mode enabled, prefer explicit types, use `.tsx` for React components
+- **React**: Functional components with hooks, React 19 features, JSX transform
+- **Props**: Use interface definitions with optional props (e.g., `{ className?: string }`)
+- **Styling**: TailwindCSS classes, inline styles for custom fonts via `style={{ fontFamily: fonts.name }}`
+- **Assets**: Public assets in `/frontend/public`, imported with `/path` prefix
+- **Functions**: Use `function ComponentName()` declaration style, not arrow functions for components
+- **Imports**: ES modules, prefer named imports, use `.tsx` extensions in imports
+- **Naming**: PascalCase for components, camelCase for variables/functions
+- **No Tests**: No testing framework configured - purely presentation website