mdtablefix 0.6.1

`mdtablefix` unb0rks and reflows Markdown tables so that each column has a uniform width. When the `--wrap` option is used, it also wraps paragraphs and list items to 80 columns.
Documentation
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- Observation: the README still documents `netsuke manifest FILE` and
  `--file`. Evidence: the README CLI block lists `netsuke manifest FILE` and the
  `--file` option. Impact: user-facing docs need a planned-surface update
  after the design and roadmap are aligned.