CPU Player Controller: KnightGuy (Character 7)

**Subtask of #164**: Implement CPU player controller for KnightGuy (Character 7).

**Character Details:**
- **Name**: KnightGuy
- **Character ID**: 7
- **Type**: [To be determined based on character design]

**CPU Controller Requirements:**
- Implement AI decision-making for movement, attacks, and defense
- Character-specific behavior patterns and strategies
- Difficulty scaling (Easy/Medium/Hard)
- Proper collision detection and response
- Animation state management
- Special ability usage

**Implementation Notes:**
- Follow existing character attack patterns from CharacterAttacks.bas
- Integrate with existing movement and physics systems
- Ensure proper 4-player compatibility
- Test across all TV standards (NTSC/PAL/SECAM)

**Dependencies:**
- Character-specific attack logic
- Movement system integration
- Animation system compatibility
- Collision detection system

**Acceptance Criteria:**
- CPU player behaves intelligently for KnightGuy
- Proper difficulty scaling
- No conflicts with human players
- Maintains 60fps performance