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