Add working tutorial implementations covering:
- Part 0: Basic setup and character display
- Part 1: Movement and grid interaction
- Part 2: Movement variations (naive, queued, final)
- Part 3: Dungeon generation
- Part 4: Field of View
- Part 5: Entities and interactions
- Part 6: Combat system
Each part includes corresponding README with explanations.
Implementation plan document included for parts 6-8.
Tutorial follows "forward-only" philosophy - each step builds
on previous without requiring refactoring.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
