Keep the existing single-dash switch style and case-insensitive matching,
but add the cheap, non-breaking POSIX wins:
- `--` end-of-options: tokens after a bare `--` are treated as literal operands
- `--help`/`-h` (alongside `-?`) and `-V`/`--version`
- Main returns a real exit code: 2 for usage errors, propagates handler
return codes, and a top-level catch yields a quiet 1 on unhandled errors
Co-Authored-By: Claude Opus 4.8 <[email protected]>
jimandClaude Opus 4.8
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