feat: Add meeting detection and fix console warnings

[r3dbars]

Summary

• Meeting Detection: Intelligent detection of calendar events and audio activity to prompt recording when meetings start
• Console Warning Fixes: Clean up SwiftUI and CoreAudio console warnings
• Reliability Testing: Add monitoring script for long recording sessions

Changes

Meeting Detection Feature

• Add MeetingDetector class that monitors:
  • Calendar events (via EventKit)
  • System audio activity patterns
• Add MeetingDetectedOverlay UI component showing "Meeting detected - Record?" prompt
• Integrate with PillStateManager for seamless state transitions
• Add Settings toggle to enable/disable meeting detection (defaults to enabled)

Console Warning Fixes

• Fix onChange(of: DisplayStatus) action tried to update multiple times per frame by debouncing rapid status updates with Task { @MainActor in ... }
• Improve CoreAudio cleanup sequence in SystemAudioCapture to minimize internal framework warnings
• Document expected HALC warnings (cannot be suppressed from user code)

Documentation

• Add "Expected Console Warnings" section to MEMORY.md explaining:
  • HALC_ShellObject::SetPropertyData - normal during aggregate device creation
  • throwing -10877 - internal format negotiation
  • AudioObjectRemovePropertyListener - cleanup race condition (harmless)

Testing Tools

• Add monitor-recording.sh script for monitoring long recording sessions

Test Plan

• Start app and verify meeting detection prompt appears when calendar event is active
• Test dismiss button hides prompt and starts cooldown
• Test record button starts recording and dismisses prompt
• Verify Settings toggle enables/disables meeting detection
• Run 30+ minute recording and verify no console warnings affect audio quality
• Verify build compiles without warnings

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