Implement AudioStrategyFactory for IAudioStrategy creation

[danieljsinclair]

Issue Type

Implementation - Architecture Refactoring

Severity

High - Critical path for Option B implementation

Problem Statement

Current AudioModeFactory creates IAudioMode instances. Need AudioStrategyFactory to create IAudioStrategy instances following consolidation.

Current State

• AudioModeFactory creates IAudioMode instances
• Factory decides between ThreadedAudioMode and SyncPullAudioMode
• Tied to old IAudioMode interface
• No IAudioStrategy creation capability

Target State

AudioStrategyFactory creates IAudioStrategy instances:

• Decides between ThreadedStrategy and SyncPullStrategy based on API capabilities
• Follows OCP (no switch statement, uses types)
• Encapsulates selection logic (SRP)
• Easy to add new strategies

Implementation Tasks

1. Create AudioStrategyFactory.h/.cpp
2. Implement createStrategy() method
3. Remove old AudioModeFactory
4. Update all creation points to use AudioStrategyFactory

Acceptance Criteria

• AudioStrategyFactory.h/.cpp created
• Implements createStrategy() returning IAudioStrategy*
• Selection logic uses types (no enum/switch)
• Old AudioModeFactory removed
• All creation points updated to use AudioStrategyFactory
• No circular dependencies introduced
• Easy to add new strategies (OCP compliance)

Testing Requirements

• Factory creates correct strategy type based on capabilities
• Both ThreadedStrategy and SyncPullStrategy can be created
• Factory can be mocked for unit tests
• No test failures introduced

Related Issues

• Implement IAudioStrategy interface consolidation #22 - IAudioStrategy interface consolidation
• Consolidate ThreadedStrategy implementation #26 - ThreadedStrategy consolidation
• Consolidate SyncPullStrategy implementation #28 - SyncPullStrategy consolidation

References

• ARCHITECTURE_FILE_CLASS_AUDIT.md - Factory pattern violations
• AUDIO_MODULE_ARCHITECTURE.md - Phase 6 consolidation plan