Co-authored-by: Cursor <cursoragent@cursor.com>
Clarify Vo is hardware-only, backlight-off is usually unreadable on blue/white modules, and refresh meta/changelog. Co-authored-by: Cursor <cursoragent@cursor.com>
PCF8574 backpack on SDA=GPIO22/SCL=GPIO27, demo/hello/clear/backlight UI, and flashable firmware/cyd package. Co-authored-by: Cursor <cursoragent@cursor.com>