AI player difficulty (handicap) set by right difficulty switch

Implement AI player difficulty/handicap system controlled by the right difficulty switch.

**Feature Description**:
- When right difficulty switch is set to "difficult" position: AI plays at full speed with optimal logic
- When right difficulty switch is set to "easy" position: AI has handicap applied:
- Slower reaction time (AI logic runs less frequently or with delays)
- Makes mistakes (sub-optimal decisions, occasional missed inputs)

**Implementation Notes**:
- Read right difficulty switch state: `switches` or difficulty switch bit
- Apply handicap modifiers to AI decision-making timing
- Introduce occasional sub-optimal choices when handicap is active
- Should work for any AI-controlled character

**Use Case**: Makes the game easier for players when playing against AI opponents.

**Location**: AI logic/routines
**Status**: Needs implementation
**Priority**: Enhancement