[BUG] mo purge -h is rejected as unknown option #1771

Before submitting

• I updated and reproduced the problem, or this report explains why I cannot update.

Describe the bug

Running mo purge -h fails with an unknown option error:

Unknown option: -h
Use 'mo purge --help' for usage information

Every other command in Mole (clean, uninstall, optimize, installer, history, touchid, completion, update, remove) accepts both -h and --help to display help information and exit with status 0. In bin/purge.sh line 340, the argument parsing case only matches "--help", rejecting -h with exit code 1. Furthermore, show_help in bin/purge.sh describes the flag as --help Show this help message rather than -h, --help Show this help message.

Commit analyzed: 8c55e8c076ae41a99ca094589d892fc0a7eb5137

Steps to reproduce

1. Run command: mo purge -h
2. See error:

   Unknown option: -h
   Use 'mo purge --help' for usage information
   

3. Command exits with status code 1.

Expected behavior

mo purge -h should show usage information and exit with status code 0, matching mo purge --help and the behavior of all other Mole subcommands.

Debug logs

$ mo purge -h
Unknown option: -h
Use 'mo purge --help' for usage information

Environment

Mole 1.61.0
macOS 15.0

Additional context

In tests/cli.bats, the test every command answers --help with usage and exit 0 covers --help across subcommands but does not assert -h.