Add comprehensive brightness implementation guide for Restless app

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This document provides step-by-step instructions for implementing the exact
MonitorControl brightness mechanism that works reliably on both Intel and
Apple Silicon Macs.

Key components documented:
- IntelDDC: IOI2CInterface-based DDC/CI for Intel Macs
- Arm64DDC: IOAVService-based DDC for Apple Silicon
- Display base class: Smooth transitions and software brightness
- AppleDisplay: DisplayServices API for built-in displays
- OtherDisplay: DDC with combined hardware+software mode
- DisplayManager: Shade system and gamma enforcer

Includes critical implementation details, timing parameters, thread safety
requirements, and comprehensive testing checklist.

This is the PROVEN mechanism used by thousands of MonitorControl users.

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Claude 2025-11-18 22:08:05 +00:00

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