* fix(cli): preserve literal Markdown table facts
* test(cli): retain capacity diagnostics through Markdown escaping
* fix(cli): keep intraword underscores readable in Markdown tables
Underscore runs between letters or digits cannot open or close CommonMark emphasis, so escaping them only adds noise to identifiers such as source_index and invalid_request in raw Markdown. Escape underscore runs only at word boundaries and restore the original diagnostic assertions.