Clarify FillSilence location in architecture documentation

[danieljsinclair]

Issue Type

Documentation Improvement

Severity

Low - Clarification needed

Problem Statement

Documentation needs to be consistent about the location of FillSilence utility:

• Correct location: CLI (src/audio/utils/AudioUtils.cpp/h) - platform-specific
• Incorrect location: Bridge (platform-agnostic C API) - should NOT contain platform-specific code

Context from Task #65

The architecture audit established these key principles:

1. FillSilence lives in CLI (not bridge) - it's platform-specific
2. Buffer/frame/sim code belongs in CLI
3. IAudioPlatform is FUTURE iOS/ESP32 support (NOT abandoned)

Current Status

Documentation has been partially updated but should be audited to ensure:

• All references to FillSilence correctly place it in CLI/utils
• No contradictions remain
• Bridge section correctly describes platform-agnostic nature
• CLI section correctly describes platform-specific utilities

Files to Review

• docs/AUDIO_MODULE_ARCHITECTURE.md - Check "Bridge Utility Pattern" section
• docs/ARCHITECTURE_TODO.md - Check architecture notes
• Any other documentation that mentions FillSilence or audio utilities

Acceptance Criteria

• All documentation correctly places FillSilence in CLI/src/audio/utils
• Bridge section emphasizes platform-agnostic nature (no FillSilence)
• CLI section describes platform-specific utilities accurately
• No contradictions about FillSilence location exist

Related Issues

• CRITICAL: Documentation describes non-existent NEW architecture (IAudioStrategy) #8 - CRITICAL: Documentation describes non-existent NEW architecture
• Remove/accurately document SilentRenderer in architecture docs #9 - Remove/accurately document SilentRenderer

References

• Task #65: CLI Documentation Audit
• Architecture audit findings: FillSilence should live in CLI (platform-specific)