- Add new brightness-deadband property (default 10.0, range 0.0-50.0)
- Implements deadband/tolerance zone around target brightness
- When brightness is within ±deadband, no adjustments are made
- Prevents oscillation at fast update rates (10-100ms)
- Allows fast corrections when brightness significantly deviates
- Enables fast ramp rates without flicker/oscillation
- Updated README with detailed deadband documentation and usage examples
- Solves exposure fluctuation issue at high frame rates with fast updates
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