eink-screen

Build, flash, and monitor the eink-screen firmware on the LilyGo T5 ePaper S3 PRO, with recovery for the recurring USB-port-drop and wrong-port-auto-detect gotchas and a serial-capture recipe. TRIGGER when the user wants to build/compile, upload/flash, or watch serial for this firmware ("flash it", "upload", "build and run", "check the serial log", "why won't it flash"). DO NOT trigger for editing the display layout (that's HelmLog / `/preview`) or for pure code questions.

Render and view the HelmLog e-paper display frame from your Mac without the device, and iterate the layout. TRIGGER when the user wants to see what the panel shows/will show, preview a display change, or tweak the instrument layout ("what does the display look like", "preview the screen", "change the layout", "make the labels bigger"). DO NOT trigger for flashing the device (that's `/flash`) or firmware transport/WiFi issues.