nbari / backup / 27096443186

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Implement edit: add/remove a backup's directories and files

- edit was a dead stub (subcommand defined but no dispatch arm); wire it up
  via dispatch/cmd_edit.rs, Action::Edit, actions/edit.rs, and the bin match.
- `edit <name> -d DIR -f FILE` adds (existence-checked); `--rm-dir/--rm-file`
  remove (string match, path need not exist). No flags prints current config.
- Normalize & replace: collapse dirs to non-overlapping parents and drop files
  now covered by a dir (same invariant as new); engine/edit.rs + catalog
  set_directories/set_files; get_unique_dir_parents exposed from create.
- Extract duplicated clap validators into commands/validators.rs (shared by
  new and edit).
- README documents edit. 57 tests passing.

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