- Move openclaw-personal-ai-assistant.md from windows_specific/ to OPEN_CLAW/
- Add validate-security.sh: cross-platform security scanner with visual output
- 7 check categories: installation, gateway config, file permissions,
network security, API keys, system security, openclaw doctor
- Green ticks (pass), red crosses (fail), yellow warnings
- Numbered recommendations list with fix commands
- Works on macOS, Linux, and WSL2