chore(claude-md): address Copilot review feedback

- Tests: replace bare `pytest tests/` with the working invocation
  (`cd tests && PYTHONPATH=../scripts python -m pytest ...`) since the
  test imports from `scripts/` which is not on PYTHONPATH by default.
- Vale: expand the single-file invocation into a copy-pasteable
  `docker run` command instead of the placeholder `docker run ...`.
- Sphinx extensions bullet: add the missing `cmdincludemd`,
  `cfgcmdlist`, `opcmdlist` directives (and `cfgcmd`/`opcmd` roles)
  registered by `docs/_ext/vyos.py`.
- Command directives section: clarify that the MyST include directive is
  `cmdincludemd` (not `cmdinclude`) — RST pages use `cmdinclude`,
  MD pages use `cmdincludemd`.
- Linter suppression markers: clarify that `{eval-rst}` blocks inside
  Markdown pages keep the `..` RST marker form, while top-level Markdown
  uses the `%` MyST comment form.

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