Command level enter: false

[tony]

re: #53 #293 #735

session_name: Skip command execution (command-level)
windows:
- panes:
  - shell_command:
    # You can see this
    - echo "___$((11 + 1))___"
    # This is skipped
    - cmd: echo "___$((1 + 3))___"
      enter: false