No nvm/Volta Coexistence Rule

This rule applies to files matching the patterns above.

# No nvm/Volta Coexistence Rule

## Rule
Only ONE Node.js version manager may be installed at a time. If using Volta, completely remove nvm, fnm, n, or nodenv. Running multiple version managers causes PATH conflicts and unpredictable behavior.

## Removal Checklist

### Remove nvm
```bash
# Remove nvm directory
rm -rf ~/.nvm

# Remove from shell config (.zshrc, .bashrc)
# Delete these lines:
# export NVM_DIR="$HOME/.nvm"
# [ -s "$NVM_DIR/nvm.sh" ] && source "$NVM_DIR/nvm.sh"
```

### Remove fnm
```bash
rm -rf ~/.fnm
# Remove 'eval "$(fnm env)"' from shell config
```

### Remove n
```bash
npm uninstall -g n
rm -rf /usr/local/n
```

### Verify Clean State
```bash
# Should only show Volta's shim
which node    # → ~/.volta/bin/node
which npm     # → ~/.volta/bin/npm

# Should return nothing
command -v nvm   # → (empty)
command -v fnm   # → (empty)
```

## Good
```bash
# Only Volta installed
which node  # ~/.volta/bin/node
volta list  # Shows managed versions
```

## Bad
```bash
# Both installed — CONFLICT
which node  # Could be nvm OR Volta depending on PATH order
nvm use 18  # Overrides Volta's pin!
```