forzagreen / n2words / 26671491394

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docs(scripts): fix and standardize lang:add invocation examples (#310)

Three usability fixes to the language scaffolding tool:

- The script's own examples (docstring + --help) showed
  `npm run lang:add ko-KR --cardinal`, where npm swallows the
  `--cardinal` flag and warns "Unknown cli config". Add the `--`
  separator so the flag reaches the script, and explain why it's
  needed.
- Standardize every doc (README, CONTRIBUTING, CLAUDE.md) on the
  always-safe `npm run lang:add -- <code>` form, matching the PR
  template. Previously these omitted `--`, which works for a bare
  code on npm 11 but breaks the moment a flag is added.
- Fix the post-scaffold "Next steps": it told contributors to run
  `npm test`, which fails by design on the freshly generated empty
  fixtures. Now it states a case per form is required first, and
  drops the redundant `npm run build:types` step (npm test already
  builds types).

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