Consolidate ThreadedStrategy implementation

[danieljsinclair]

Issue Type

Implementation - Architecture Refactoring

Severity

High - Critical path for Option B implementation

Problem Statement

ThreadedAudioMode and ThreadedRenderer are separate coupled classes. Need to consolidate into single ThreadedStrategy that combines lifecycle + rendering.

Current State

• ThreadedAudioMode (11 methods) - mode lifecycle
• ThreadedRenderer (4 methods) - cursor-chasing rendering
• Tight coupling: ThreadedAudioMode creates ThreadedRenderer in createContext()
• Cannot use ThreadedRenderer independently
• SRP violation: Responsibility split across two classes

Target State

Single ThreadedStrategy class implementing IAudioStrategy:

• Combines all ThreadedAudioMode + ThreadedRenderer functionality
• Implements IAudioStrategy interface completely
• Self-contained (no external renderer creation)
• Maintains cursor-chasing rendering behavior
• Preserves all existing functionality

Implementation Tasks

1. Create ThreadedStrategy.h implementing IAudioStrategy
2. Merge ThreadedAudioMode + ThreadedRenderer into ThreadedStrategy
3. Remove ThreadedAudioMode + ThreadedRenderer files
4. Update AudioPlayer to use ThreadedStrategy
5. Ensure all existing tests pass

Acceptance Criteria

• ThreadedStrategy.h/.cpp created implementing IAudioStrategy
• All ThreadedAudioMode functionality migrated to ThreadedStrategy
• All ThreadedRenderer functionality migrated to ThreadedStrategy
• Old ThreadedAudioMode + ThreadedRenderer files removed
• AudioPlayer updated to use ThreadedStrategy
• All existing ThreadedRenderer tests pass
• No functionality lost (behavior preserved)

Testing Requirements

• ThreadedRenderer unit tests pass (9 tests)
• Integration tests pass
• Baseline regression tests pass (output identical)
• No test failures introduced

Related Issues

• Implement IAudioStrategy interface consolidation #22 - IAudioStrategy interface consolidation
• Implement IAudioHardwareProvider interface consolidation #24 - IAudioHardwareProvider interface consolidation

References

• ARCHITECTURE_FILE_CLASS_AUDIT.md - Coupling violations
• AUDIO_MODULE_ARCHITECTURE.md - Phase 6 consolidation plan
• test/unit/ThreadedRendererTest.cpp - Existing test coverage