# StableLCD 1.3.0

This release introduces a complete PCF8574 I2C backend while preserving the layered StableLCD architecture.

### Added

- PCF8574 I2C backend (`HD44780PIN_I2C`)
- Configurable I2C address and bus speed
- Optional LCD backlight control
- Optional LCD power control with configurable polarity
- I2C example sketches

### Changed

- Optimized RS handling in `HD44780PHY`
- Updated README with I2C backend documentation
- Added the I2C backend as a reference implementation for custom backends

This release demonstrates how new physical backends can be added without modifying the LCD logic or synchronization layers.
