## Description
The `convert` and `reduce` commands used `--from` and `--to` flags to specify input/output representations.
These names are ambiguous and don't clearly describe what they control.
This PR renames them to `--input`/`--output` and adds `-i`/`-o` short aliases for convenience.
- Rename `--from` to `--input` (`-i`) in `convert` and `reduce` commands.
- Rename `--to` to `--output` (`-o`) in the `convert` command.
- Switch from `StringVar` to `StringVarP` to support the new short flags.
## Benefits
- Flag names now clearly indicate they refer to representations, not file paths.
- Short aliases `-i` and `-o` make CLI usage more concise.
## Checklist
- [x] Code follows conventional commit format.
- [x] Branch follows naming convention (`<type>/<description>`). Always use underscores.
- [x] Tests pass (if applicable).
- [ ] Documentation updated (if applicable).
Reviewed-on: #42
Co-authored-by: M.V. Hutz <git@maximhutz.me>
Co-committed-by: M.V. Hutz <git@maximhutz.me>
mvhutz
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