Remove boilerplate community files and stale docs

Delete auto-generated templates and redundant documentation:
- CODE_OF_CONDUCT.md, CONTRIBUTING.md, SECURITY.md (generic templates)
- .github/ issue and PR templates (unnecessary for personal project)
- docs/architecture.md, roadmap.md, scripts.md (stale, now covered by README and CLAUDE.md)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: maxitoon