chore: complete root directory cleanup - remove relocated files

Removed files that were already moved in previous commit:
- Docker files (now in scripts/docker/)
- Utility scripts (now in scripts/)
- Test .scm files (no longer needed in root)
- Old chat export JSON (unnecessary)
- ui-concept.png (now in assets/)

Root directory reduced from 51 to 37 items.
Only essential project files remain in root.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: 0xrinegade