CPU Player Controller: Shamone (Character 15)

**Subtask of #164**: Implement CPU player controller for Shamone (Character 15).

**Character Details:**
- **Name**: Shamone (formerly Veg Dog - renamed per #317)
- **Character ID**: 15
- **Weight**: 29.48 kg (65.0 lbs)
- **Attack Type**: Melee
- **Special**: Upward attack/jump combo, form switching with Meth Hound (Character 31)

**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 (form switching, upward attack)

**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)
- Handle form switching logic (Shamone ↔ Meth Hound)

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

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