--- without docs
1. chose ' rollback'  candidates: ' rollback' 0.977  ' roll' 0.011  ' release' 0.004
2. chose ' r'         candidates: ' r' 0.979  ' --' 0.009  ' release' 0.006
3. chose '4'          candidates: '4' 1.000  ' r' 0.000  '3' 0.000
4. chose '1'          candidates: '1' 1.000  '0' 0.000  '2' 0.000
5. chose ''           candidates: (end of sequence)
text: shipctl rollback r41
--- with rollback.md
1. chose ' rollback'  candidates: ' rollback' 1.000  ' rollout' 0.000  ' roll' 0.000
2. chose ' --'        candidates: ' --' 1.000  ' -' 0.000  ' production' 0.000
3. chose 'env'        candidates: 'env' 1.000  'environment' 0.000  ' env' 0.000
4. chose ' production' candidates: ' production' 1.000  ' prod' 0.000  '=' 0.000
5. chose ' --'        candidates: ' --' 1.000  ' \\' 0.000  ' -' 0.000
6. chose 'to'         candidates: 'to' 1.000  'from' 0.000  '--' 0.000
7. chose ' r'         candidates: ' r' 1.000  ' release' 0.000  'r' 0.000
8. chose '4'          candidates: '4' 1.000  '1' 0.000  '3' 0.000
text: shipctl rollback --env production --to r4