Surya Balaji b48eebe5df Restructure ESP32 firmware into layered architecture with serial streaming ...

Architecture changes:
- config/: Centralized pin definitions and settings
- hal/: Hardware abstraction layer (servo PWM control)
- drivers/: Device drivers (hand, emg_sensor)
- core/: Business logic (gestures)
- app/: Application entry point

New features:
- Fake EMG data streaming over USB serial at ~100 Hz
- FEATURE_FAKE_EMG flag to switch between fake/real sensors
- Python RealSerialStream class for receiving serial data

Data format: timestamp_ms,ch0,ch1,ch2,ch3

2026-01-19 00:02:24 -06:00

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