Trim em dashes, convert first-person plural to second person, and
tighten sentences in README.md, docs/GUIDE.md, docs/self-review.md,
and frontend/README.md, matching the style already applied to code
comments. No technical content, numbers, or code blocks changed.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N7vUFpYkLrJnuSgwcRjqSx