```ruby
module Metacrunch
  class Cli
    include Commander::Methods

    def run
      program :name, "metacrunch"
      program :version, Metacrunch::VERSION
      program :description, "Data processing and ETL toolkit for Ruby."

      default_command :help

      setup_run_command

      run!
    end

  private

    def setup_run_command
      command :run do |c|
        c.syntax = "metacrunch run <file>"
        c.description = "Runs a metacrunch job description."
        c.action do |args, options|
          if args.empty?
            say "You need to provide a job description file."
            exit(1)
          elsif args.size > 1
            say "You can't run more than one job description at once."
            exit(1)
          else
            say "TODO"
          end
        end
      end
    end

  end
end
```

Improve CLI to actually run metacrunch job files.
user
```ruby
module Metacrunch
  class Cli
    include Commander::Methods

    def run
      program :name, "metacrunch"
      program :version, Metacrunch::VERSION
      program :description, "Data processing and ETL toolkit for Ruby."

      default_command :help

      setup_run_command

      run!
    end

  private

    def setup_run_command
      command :run do |c|
        c.syntax = "metacrunch run <file>"
        c.description = "Runs a metacrunch job description."
        c.action do |args, options|
          if args.empty?
            say "You need to provide a job description file."
            exit(1)
          else
            args.each do |filename|
              contents = File.read(filename)
              Metacrunch::Job.define(contents, filename: filename).run
            end
          end
        end
      end
    end

  end
end
```
assistant