- LiveCapture.cs: real-time WASAPI loopback capture with rolling buffer
and continuous FFT analysis, enqueues WaveFrames at ~10Hz
- MusicAnalyzer.cs: refactored ExtractFeatures/MapPitchToPeriod/BuildWaveFrame
as public reusable methods with sampleRate parameter
- MainForm: audio device selector (defaults to system default), Live button
starts/stops capture, Stop All stops live too
- Adaptive normalization (running max with slow decay) for live volume changes
