Volta Global Tool Installation Rule

This rule applies to files matching the patterns above.

# Volta Global Tool Installation Rule

## Rule
All global CLI tools MUST be installed with `volta install`, NEVER with `npm install -g` or `yarn global add`. This ensures tools are project-aware and cleanly managed.

## Why
Volta-installed globals use the project's pinned Node version when run inside a project. npm globals always use the system Node, causing version mismatches and subtle bugs.

## Good
```bash
volta install typescript
volta install prettier
volta install eslint
volta install tsx
```

## Bad
```bash
npm install -g typescript     # Uses system Node always
yarn global add prettier      # Not managed by Volta
sudo npm install -g eslint    # Never use sudo!
```

## Migration from npm globals
```bash
# List npm globals
npm list -g --depth=0

# Reinstall through Volta
npm uninstall -g typescript prettier eslint
volta install typescript prettier eslint

# Verify
volta list all
```

## Exception
```bash
# Only exception: tools that manage Volta itself
# npm/yarn are managed by Volta directly via volta pin
```