Cleanup NVM-managed Node versions

cleanup-node-versions.sh

# Add to .zshrc or similar, and run `cleanup-node-versions`
cleanup-node-versions() {
    echo "Starting NVM cleanup..."
    
    # Get all installed versions and sort them
    local installed=($(nvm ls | grep -o "v[0-9]\+\.[0-9]\+\.[0-9]\+" | sort -V))
    
    # Track versions to keep
    local keep=()
    local current_major=""
    local latest_version=""
    
    # Find latest version for each major release
    for version in ${installed[@]}; do
        local major=$(echo $version | cut -d. -f1)
        
        if [[ $major != $current_major ]]; then
            # New major version found
            [[ -n $latest_version ]] && keep+=($latest_version)
            current_major=$major
            latest_version=$version
        else
            # Same major version, update if newer
            latest_version=$version
        fi
    done
    # Add the last latest version
    [[ -n $latest_version ]] && keep+=($latest_version)
    
    # Remove versions not in keep list
    for version in ${installed[@]}; do
        if [[ ! " ${keep[@]} " =~ " ${version} " ]]; then
            echo "Removing $version..."
            nvm uninstall $version
        fi
    done
    
    echo "Cleanup complete. Remaining versions:"
    nvm ls
}