# Agent Instructions: Rat Chat

## Architecture
- **Backend**: `backend/app` (Bun, ElysiaJS, WebSockets)
- **Frontend**: `frontend` (Vite, React, TypeScript)

## Commands
- **Backend Dev**: `cd backend/app && bun dev`
- **Backend Test**: `cd backend/app && bun test` (Run single: `bun test <path>`)
- **Type Check**: `bun x tsc --noEmit` (Run in respective package)

## Code Standards
- **General**: TypeScript Strict Mode, ES Modules (`import`/`export`), `async/await`.
- **Formatting**: 2-space indentation, semicolons.
- **Naming**: `camelCase` for vars/funcs, `PascalCase` for Components/Types.
- **Backend**:
  - Follow ElysiaJS patterns for routing and state.
  - Separate HTTP (`src/api`) and WebSocket (`src/ws`) logic.
- **Frontend**:
  - React Functional Components + Hooks.
  - File structure: `src/components`, `src/hooks`.