docs: add terminal documentation

Explains terminal features including:
- Password protection and how to disable it
- Keyboard shortcuts (Alt+D, Alt+S, Alt+W)
- Theming, font size, scrollback
- Architecture overview
- Troubleshooting tips

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/terminal.md

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+# Terminal
+
+The integrated terminal provides a full-featured terminal emulator within Automaker, powered by xterm.js.
+
+## Unlocking the Terminal
+
+The terminal is password-protected by default. To unlock:
+
+1. Go to **Settings** (gear icon in sidebar)
+2. Navigate to the **Terminal** section
+3. Enter your password and click **Unlock**
+
+To disable password protection entirely:
+1. Unlock the terminal first
+2. Toggle off **Require password to unlock terminal**
+3. The terminal will now be accessible without a password
+
+## Keyboard Shortcuts
+
+When the terminal is focused, the following shortcuts are available:
+
+| Shortcut | Action |
+|----------|--------|
+| `Alt+D` | Split terminal right (horizontal split) |
+| `Alt+S` | Split terminal down (vertical split) |
+| `Alt+W` | Close current terminal |
+
+Global shortcut (works anywhere in the app):
+| Shortcut | Action |
+|----------|--------|
+| `Cmd+`` (Mac) / `Ctrl+`` (Windows/Linux) | Toggle terminal view |
+
+## Features
+
+### Multiple Terminals
+- Create multiple terminal tabs using the `+` button
+- Split terminals horizontally or vertically within a tab
+- Drag terminals to rearrange them
+
+### Theming
+The terminal automatically matches your app theme. Supported themes include:
+- Light / Dark / System
+- Retro, Dracula, Nord, Monokai
+- Tokyo Night, Solarized, Gruvbox
+- Catppuccin, One Dark, Synthwave, Red
+
+### Font Size
+- Use the zoom controls (`+`/`-` buttons) in each terminal panel
+- Or use `Cmd/Ctrl + Scroll` to zoom
+
+### Scrollback
+- The terminal maintains a scrollback buffer of recent output
+- Scroll up to view previous output
+- Output is preserved when reconnecting
+
+## Architecture
+
+The terminal uses a client-server architecture:
+
+1. **Frontend** (`apps/app`): xterm.js terminal emulator with WebGL rendering
+2. **Backend** (`apps/server`): node-pty for PTY (pseudo-terminal) sessions
+
+Communication happens over WebSocket for real-time bidirectional data flow.
+
+### Shell Detection
+
+The server automatically detects the best shell:
+- **WSL**: User's shell or `/bin/bash`
+- **macOS**: User's shell, zsh, or bash
+- **Linux**: User's shell, bash, or sh
+- **Windows**: PowerShell 7, PowerShell, or cmd.exe
+
+## Troubleshooting
+
+### Terminal not connecting
+1. Ensure the server is running (`npm run dev:server`)
+2. Check that port 3008 is available
+3. Verify the terminal is unlocked
+
+### Slow performance with heavy output
+The terminal throttles output at ~60fps to prevent UI lockup. Very fast output (like `cat` on large files) will be batched.
+
+### Shortcuts not working
+- Ensure the terminal is focused (click inside it)
+- Some system shortcuts may conflict (especially Alt+Shift combinations on Windows)